David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1 | /* |
| 2 | * ADS7846 based touchscreen and sensor driver |
| 3 | * |
| 4 | * Copyright (c) 2005 David Brownell |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 5 | * Copyright (c) 2006 Nokia Corporation |
| 6 | * Various changes: Imre Deak <imre.deak@nokia.com> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 7 | * |
| 8 | * Using code from: |
| 9 | * - corgi_ts.c |
| 10 | * Copyright (C) 2004-2005 Richard Purdie |
| 11 | * - omap_ts.[hc], ads7846.h, ts_osk.c |
| 12 | * Copyright (C) 2002 MontaVista Software |
| 13 | * Copyright (C) 2004 Texas Instruments |
| 14 | * Copyright (C) 2005 Dirk Behme |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License version 2 as |
| 18 | * published by the Free Software Foundation. |
| 19 | */ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 20 | #include <linux/hwmon.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 21 | #include <linux/init.h> |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 22 | #include <linux/err.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 23 | #include <linux/delay.h> |
| 24 | #include <linux/input.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/slab.h> |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 27 | #include <linux/gpio.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 28 | #include <linux/spi/spi.h> |
| 29 | #include <linux/spi/ads7846.h> |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 30 | #include <linux/regulator/consumer.h> |
Andrew Morton | 3ac8bf0 | 2006-03-26 01:37:33 -0800 | [diff] [blame] | 31 | #include <asm/irq.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 32 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 33 | /* |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 34 | * This code has been heavily tested on a Nokia 770, and lightly |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 35 | * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz). |
David Brownell | bff0de5 | 2007-05-22 23:28:40 -0400 | [diff] [blame] | 36 | * TSC2046 is just newer ads7846 silicon. |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 37 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
| 38 | * Support for ads7845 has only been stubbed in. |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 39 | * Support for Analog Devices AD7873 and AD7843 tested. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 40 | * |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 41 | * IRQ handling needs a workaround because of a shortcoming in handling |
| 42 | * edge triggered IRQs on some platforms like the OMAP1/2. These |
| 43 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we |
| 44 | * have to maintain our own SW IRQ disabled status. This should be |
| 45 | * removed as soon as the affected platform's IRQ handling is fixed. |
| 46 | * |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 47 | * App note sbaa036 talks in more detail about accurate sampling... |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 48 | * that ought to help in situations like LCDs inducing noise (which |
| 49 | * can also be helped by using synch signals) and more generally. |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 50 | * This driver tries to utilize the measures described in the app |
| 51 | * note. The strength of filtering can be set in the board-* specific |
| 52 | * files. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 53 | */ |
| 54 | |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 55 | #define TS_POLL_DELAY (1 * 1000000) /* ns delay before the first sample */ |
| 56 | #define TS_POLL_PERIOD (5 * 1000000) /* ns delay between samples */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 57 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 58 | /* this driver doesn't aim at the peak continuous sample rate */ |
| 59 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) |
| 60 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 61 | struct ts_event { |
| 62 | /* For portability, we can't read 12 bit values using SPI (which |
| 63 | * would make the controller deliver them as native byteorder u16 |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 64 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 65 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 66 | */ |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 67 | u16 x; |
| 68 | u16 y; |
| 69 | u16 z1, z2; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 70 | int ignore; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 71 | }; |
| 72 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 73 | /* |
| 74 | * We allocate this separately to avoid cache line sharing issues when |
| 75 | * driver is used with DMA-based SPI controllers (like atmel_spi) on |
| 76 | * systems where main memory is not DMA-coherent (most non-x86 boards). |
| 77 | */ |
| 78 | struct ads7846_packet { |
| 79 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
| 80 | u16 dummy; /* for the pwrdown read */ |
| 81 | struct ts_event tc; |
| 82 | }; |
| 83 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 84 | struct ads7846 { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 85 | struct input_dev *input; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 86 | char phys[32]; |
Michael Roth | b58895f | 2009-05-18 16:05:12 -0700 | [diff] [blame] | 87 | char name[32]; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 88 | |
| 89 | struct spi_device *spi; |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 90 | struct regulator *reg; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 91 | |
| 92 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 93 | struct attribute_group *attr_group; |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 94 | struct device *hwmon; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 95 | #endif |
| 96 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 97 | u16 model; |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 98 | u16 vref_mv; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 99 | u16 vref_delay_usecs; |
| 100 | u16 x_plate_ohms; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 101 | u16 pressure_max; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 102 | |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 103 | bool swap_xy; |
| 104 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 105 | struct ads7846_packet *packet; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 106 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 107 | struct spi_transfer xfer[18]; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 108 | struct spi_message msg[5]; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 109 | struct spi_message *last_msg; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 110 | int msg_idx; |
| 111 | int read_cnt; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 112 | int read_rep; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 113 | int last_read; |
| 114 | |
| 115 | u16 debounce_max; |
| 116 | u16 debounce_tol; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 117 | u16 debounce_rep; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 118 | |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 119 | u16 penirq_recheck_delay_usecs; |
| 120 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 121 | spinlock_t lock; |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 122 | struct hrtimer timer; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 123 | unsigned pendown:1; /* P: lock */ |
| 124 | unsigned pending:1; /* P: lock */ |
| 125 | // FIXME remove "irq_disabled" |
| 126 | unsigned irq_disabled:1; /* P: lock */ |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 127 | unsigned disabled:1; |
David Brownell | fbb38e3 | 2007-12-14 01:26:33 -0500 | [diff] [blame] | 128 | unsigned is_suspended:1; |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 129 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 130 | int (*filter)(void *data, int data_idx, int *val); |
| 131 | void *filter_data; |
| 132 | void (*filter_cleanup)(void *data); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 133 | int (*get_pendown_state)(void); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 134 | int gpio_pendown; |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 135 | |
| 136 | void (*wait_for_sync)(void); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | /* leave chip selected when we're done, for quicker re-select? */ |
| 140 | #if 0 |
| 141 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) |
| 142 | #else |
| 143 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) |
| 144 | #endif |
| 145 | |
| 146 | /*--------------------------------------------------------------------------*/ |
| 147 | |
| 148 | /* The ADS7846 has touchscreen and other sensors. |
| 149 | * Earlier ads784x chips are somewhat compatible. |
| 150 | */ |
| 151 | #define ADS_START (1 << 7) |
| 152 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ |
| 153 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ |
| 154 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ |
| 155 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ |
| 156 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ |
| 157 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ |
| 158 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ |
| 159 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ |
| 160 | #define ADS_8_BIT (1 << 3) |
| 161 | #define ADS_12_BIT (0 << 3) |
| 162 | #define ADS_SER (1 << 2) /* non-differential */ |
| 163 | #define ADS_DFR (0 << 2) /* differential */ |
| 164 | #define ADS_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */ |
| 165 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
| 166 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ |
| 167 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ |
| 168 | |
| 169 | #define MAX_12BIT ((1<<12)-1) |
| 170 | |
| 171 | /* leave ADC powered up (disables penirq) between differential samples */ |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 172 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
| 173 | | ADS_12_BIT | ADS_DFR | \ |
| 174 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 175 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 176 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
| 177 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) |
| 178 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 179 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 180 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
| 181 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 182 | |
| 183 | /* single-ended samples need to first power up reference voltage; |
| 184 | * we leave both ADC and VREF powered |
| 185 | */ |
| 186 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ |
| 187 | | ADS_12_BIT | ADS_SER) |
| 188 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 189 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
| 190 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 191 | |
| 192 | /*--------------------------------------------------------------------------*/ |
| 193 | |
| 194 | /* |
| 195 | * Non-touchscreen sensors only use single-ended conversions. |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 196 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
| 197 | * ads7846 lets that pin be unconnected, to use internal vREF. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 198 | */ |
| 199 | |
| 200 | struct ser_req { |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 201 | u8 ref_on; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 202 | u8 command; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 203 | u8 ref_off; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 204 | u16 scratch; |
| 205 | __be16 sample; |
| 206 | struct spi_message msg; |
| 207 | struct spi_transfer xfer[6]; |
| 208 | }; |
| 209 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 210 | static void ads7846_enable(struct ads7846 *ts); |
| 211 | static void ads7846_disable(struct ads7846 *ts); |
| 212 | |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 213 | static int device_suspended(struct device *dev) |
| 214 | { |
| 215 | struct ads7846 *ts = dev_get_drvdata(dev); |
David Brownell | fbb38e3 | 2007-12-14 01:26:33 -0500 | [diff] [blame] | 216 | return ts->is_suspended || ts->disabled; |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 217 | } |
| 218 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 219 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
| 220 | { |
| 221 | struct spi_device *spi = to_spi_device(dev); |
| 222 | struct ads7846 *ts = dev_get_drvdata(dev); |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 223 | struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 224 | int status; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 225 | int use_internal; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 226 | |
| 227 | if (!req) |
| 228 | return -ENOMEM; |
| 229 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 230 | spi_message_init(&req->msg); |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 231 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 232 | /* FIXME boards with ads7846 might use external vref instead ... */ |
| 233 | use_internal = (ts->model == 7846); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 234 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 235 | /* maybe turn on internal vREF, and let it settle */ |
| 236 | if (use_internal) { |
| 237 | req->ref_on = REF_ON; |
| 238 | req->xfer[0].tx_buf = &req->ref_on; |
| 239 | req->xfer[0].len = 1; |
| 240 | spi_message_add_tail(&req->xfer[0], &req->msg); |
| 241 | |
| 242 | req->xfer[1].rx_buf = &req->scratch; |
| 243 | req->xfer[1].len = 2; |
| 244 | |
| 245 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ |
| 246 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; |
| 247 | spi_message_add_tail(&req->xfer[1], &req->msg); |
| 248 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 249 | |
| 250 | /* take sample */ |
| 251 | req->command = (u8) command; |
| 252 | req->xfer[2].tx_buf = &req->command; |
| 253 | req->xfer[2].len = 1; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 254 | spi_message_add_tail(&req->xfer[2], &req->msg); |
| 255 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 256 | req->xfer[3].rx_buf = &req->sample; |
| 257 | req->xfer[3].len = 2; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 258 | spi_message_add_tail(&req->xfer[3], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 259 | |
| 260 | /* REVISIT: take a few more samples, and compare ... */ |
| 261 | |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 262 | /* converter in low power mode & enable PENIRQ */ |
| 263 | req->ref_off = PWRDOWN; |
| 264 | req->xfer[4].tx_buf = &req->ref_off; |
| 265 | req->xfer[4].len = 1; |
| 266 | spi_message_add_tail(&req->xfer[4], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 267 | |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 268 | req->xfer[5].rx_buf = &req->scratch; |
| 269 | req->xfer[5].len = 2; |
| 270 | CS_CHANGE(req->xfer[5]); |
| 271 | spi_message_add_tail(&req->xfer[5], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 272 | |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 273 | ts->irq_disabled = 1; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 274 | disable_irq(spi->irq); |
| 275 | status = spi_sync(spi, &req->msg); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 276 | ts->irq_disabled = 0; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 277 | enable_irq(spi->irq); |
| 278 | |
Marc Pignat | c24b260 | 2007-12-04 23:45:11 -0800 | [diff] [blame] | 279 | if (status == 0) { |
| 280 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 281 | status = be16_to_cpu(req->sample); |
| 282 | status = status >> 3; |
| 283 | status &= 0x0fff; |
Marc Pignat | c24b260 | 2007-12-04 23:45:11 -0800 | [diff] [blame] | 284 | } |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 285 | |
| 286 | kfree(req); |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 287 | return status; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 288 | } |
| 289 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 290 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
| 291 | |
| 292 | #define SHOW(name, var, adjust) static ssize_t \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 293 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
| 294 | { \ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 295 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 296 | ssize_t v = ads7846_read12_ser(dev, \ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 297 | READ_12BIT_SER(var) | ADS_PD10_ALL_ON); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 298 | if (v < 0) \ |
| 299 | return v; \ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 300 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 301 | } \ |
| 302 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); |
| 303 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 304 | |
Adam Buchbinder | b731d7b | 2009-03-13 12:15:26 -0400 | [diff] [blame] | 305 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 306 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
| 307 | * accuracy scheme without calibration data. For now we won't try either; |
| 308 | * userspace sees raw sensor values, and must scale/calibrate appropriately. |
| 309 | */ |
| 310 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) |
| 311 | { |
| 312 | return v; |
| 313 | } |
| 314 | |
| 315 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ |
| 316 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ |
| 317 | |
| 318 | |
| 319 | /* sysfs conventions report voltages in millivolts. We can convert voltages |
| 320 | * if we know vREF. userspace may need to scale vAUX to match the board's |
| 321 | * external resistors; we assume that vBATT only uses the internal ones. |
| 322 | */ |
| 323 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) |
| 324 | { |
| 325 | unsigned retval = v; |
| 326 | |
| 327 | /* external resistors may scale vAUX into 0..vREF */ |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 328 | retval *= ts->vref_mv; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 329 | retval = retval >> 12; |
| 330 | return retval; |
| 331 | } |
| 332 | |
| 333 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) |
| 334 | { |
| 335 | unsigned retval = vaux_adjust(ts, v); |
| 336 | |
| 337 | /* ads7846 has a resistor ladder to scale this signal down */ |
| 338 | if (ts->model == 7846) |
| 339 | retval *= 4; |
| 340 | return retval; |
| 341 | } |
| 342 | |
| 343 | SHOW(in0_input, vaux, vaux_adjust) |
| 344 | SHOW(in1_input, vbatt, vbatt_adjust) |
| 345 | |
| 346 | |
| 347 | static struct attribute *ads7846_attributes[] = { |
| 348 | &dev_attr_temp0.attr, |
| 349 | &dev_attr_temp1.attr, |
| 350 | &dev_attr_in0_input.attr, |
| 351 | &dev_attr_in1_input.attr, |
| 352 | NULL, |
| 353 | }; |
| 354 | |
| 355 | static struct attribute_group ads7846_attr_group = { |
| 356 | .attrs = ads7846_attributes, |
| 357 | }; |
| 358 | |
| 359 | static struct attribute *ads7843_attributes[] = { |
| 360 | &dev_attr_in0_input.attr, |
| 361 | &dev_attr_in1_input.attr, |
| 362 | NULL, |
| 363 | }; |
| 364 | |
| 365 | static struct attribute_group ads7843_attr_group = { |
| 366 | .attrs = ads7843_attributes, |
| 367 | }; |
| 368 | |
| 369 | static struct attribute *ads7845_attributes[] = { |
| 370 | &dev_attr_in0_input.attr, |
| 371 | NULL, |
| 372 | }; |
| 373 | |
| 374 | static struct attribute_group ads7845_attr_group = { |
| 375 | .attrs = ads7845_attributes, |
| 376 | }; |
| 377 | |
| 378 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) |
| 379 | { |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 380 | struct device *hwmon; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 381 | int err; |
| 382 | |
| 383 | /* hwmon sensors need a reference voltage */ |
| 384 | switch (ts->model) { |
| 385 | case 7846: |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 386 | if (!ts->vref_mv) { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 387 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 388 | ts->vref_mv = 2500; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 389 | } |
| 390 | break; |
| 391 | case 7845: |
| 392 | case 7843: |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 393 | if (!ts->vref_mv) { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 394 | dev_warn(&spi->dev, |
| 395 | "external vREF for ADS%d not specified\n", |
| 396 | ts->model); |
| 397 | return 0; |
| 398 | } |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | /* different chips have different sensor groups */ |
| 403 | switch (ts->model) { |
| 404 | case 7846: |
| 405 | ts->attr_group = &ads7846_attr_group; |
| 406 | break; |
| 407 | case 7845: |
| 408 | ts->attr_group = &ads7845_attr_group; |
| 409 | break; |
| 410 | case 7843: |
| 411 | ts->attr_group = &ads7843_attr_group; |
| 412 | break; |
| 413 | default: |
| 414 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); |
| 419 | if (err) |
| 420 | return err; |
| 421 | |
| 422 | hwmon = hwmon_device_register(&spi->dev); |
| 423 | if (IS_ERR(hwmon)) { |
| 424 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); |
| 425 | return PTR_ERR(hwmon); |
| 426 | } |
| 427 | |
| 428 | ts->hwmon = hwmon; |
| 429 | return 0; |
| 430 | } |
| 431 | |
| 432 | static void ads784x_hwmon_unregister(struct spi_device *spi, |
| 433 | struct ads7846 *ts) |
| 434 | { |
| 435 | if (ts->hwmon) { |
| 436 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); |
| 437 | hwmon_device_unregister(ts->hwmon); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | #else |
| 442 | static inline int ads784x_hwmon_register(struct spi_device *spi, |
| 443 | struct ads7846 *ts) |
| 444 | { |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, |
| 449 | struct ads7846 *ts) |
| 450 | { |
| 451 | } |
| 452 | #endif |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 453 | |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 454 | static int is_pen_down(struct device *dev) |
| 455 | { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 456 | struct ads7846 *ts = dev_get_drvdata(dev); |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 457 | |
| 458 | return ts->pendown; |
| 459 | } |
| 460 | |
| 461 | static ssize_t ads7846_pen_down_show(struct device *dev, |
| 462 | struct device_attribute *attr, char *buf) |
| 463 | { |
| 464 | return sprintf(buf, "%u\n", is_pen_down(dev)); |
| 465 | } |
| 466 | |
| 467 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); |
| 468 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 469 | static ssize_t ads7846_disable_show(struct device *dev, |
| 470 | struct device_attribute *attr, char *buf) |
| 471 | { |
| 472 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 473 | |
| 474 | return sprintf(buf, "%u\n", ts->disabled); |
| 475 | } |
| 476 | |
| 477 | static ssize_t ads7846_disable_store(struct device *dev, |
| 478 | struct device_attribute *attr, |
| 479 | const char *buf, size_t count) |
| 480 | { |
| 481 | struct ads7846 *ts = dev_get_drvdata(dev); |
Harvey Harrison | 3a0c58d | 2008-12-23 04:09:28 -0500 | [diff] [blame] | 482 | unsigned long i; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 483 | |
Joe Rouvier | 160f1fe | 2008-08-10 00:29:25 -0400 | [diff] [blame] | 484 | if (strict_strtoul(buf, 10, &i)) |
| 485 | return -EINVAL; |
| 486 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 487 | spin_lock_irq(&ts->lock); |
| 488 | |
| 489 | if (i) |
| 490 | ads7846_disable(ts); |
| 491 | else |
| 492 | ads7846_enable(ts); |
| 493 | |
| 494 | spin_unlock_irq(&ts->lock); |
| 495 | |
| 496 | return count; |
| 497 | } |
| 498 | |
| 499 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); |
| 500 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 501 | static struct attribute *ads784x_attributes[] = { |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 502 | &dev_attr_pen_down.attr, |
| 503 | &dev_attr_disable.attr, |
| 504 | NULL, |
| 505 | }; |
| 506 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 507 | static struct attribute_group ads784x_attr_group = { |
| 508 | .attrs = ads784x_attributes, |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 509 | }; |
| 510 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 511 | /*--------------------------------------------------------------------------*/ |
| 512 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 513 | static int get_pendown_state(struct ads7846 *ts) |
| 514 | { |
| 515 | if (ts->get_pendown_state) |
| 516 | return ts->get_pendown_state(); |
| 517 | |
| 518 | return !gpio_get_value(ts->gpio_pendown); |
| 519 | } |
| 520 | |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 521 | static void null_wait_for_sync(void) |
| 522 | { |
| 523 | } |
| 524 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 525 | /* |
| 526 | * PENIRQ only kicks the timer. The timer only reissues the SPI transfer, |
| 527 | * to retrieve touchscreen status. |
| 528 | * |
| 529 | * The SPI transfer completion callback does the real work. It reports |
| 530 | * touchscreen events and reactivates the timer (or IRQ) as appropriate. |
| 531 | */ |
| 532 | |
| 533 | static void ads7846_rx(void *ads) |
| 534 | { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 535 | struct ads7846 *ts = ads; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 536 | struct ads7846_packet *packet = ts->packet; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 537 | unsigned Rt; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 538 | u16 x, y, z1, z2; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 539 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 540 | /* ads7846_rx_val() did in-place conversion (including byteswap) from |
| 541 | * on-the-wire format as part of debouncing to get stable readings. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 542 | */ |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 543 | x = packet->tc.x; |
| 544 | y = packet->tc.y; |
| 545 | z1 = packet->tc.z1; |
| 546 | z2 = packet->tc.z2; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 547 | |
| 548 | /* range filtering */ |
| 549 | if (x == MAX_12BIT) |
| 550 | x = 0; |
| 551 | |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 552 | if (ts->model == 7843) { |
| 553 | Rt = ts->pressure_max / 2; |
| 554 | } else if (likely(x && z1)) { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 555 | /* compute touch pressure resistance using equation #2 */ |
| 556 | Rt = z2; |
| 557 | Rt -= z1; |
| 558 | Rt *= x; |
| 559 | Rt *= ts->x_plate_ohms; |
| 560 | Rt /= z1; |
| 561 | Rt = (Rt + 2047) >> 12; |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 562 | } else { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 563 | Rt = 0; |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 564 | } |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 565 | |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 566 | /* Sample found inconsistent by debouncing or pressure is beyond |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 567 | * the maximum. Don't report it to user space, repeat at least |
| 568 | * once more the measurement |
| 569 | */ |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 570 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 571 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
| 572 | packet->tc.ignore, Rt); |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 573 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 574 | HRTIMER_MODE_REL); |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 575 | return; |
| 576 | } |
| 577 | |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 578 | /* Maybe check the pendown state before reporting. This discards |
| 579 | * false readings when the pen is lifted. |
| 580 | */ |
| 581 | if (ts->penirq_recheck_delay_usecs) { |
| 582 | udelay(ts->penirq_recheck_delay_usecs); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 583 | if (!get_pendown_state(ts)) |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 584 | Rt = 0; |
| 585 | } |
| 586 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 587 | /* NOTE: We can't rely on the pressure to determine the pen down |
| 588 | * state, even this controller has a pressure sensor. The pressure |
| 589 | * value can fluctuate for quite a while after lifting the pen and |
| 590 | * in some cases may not even settle at the expected value. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 591 | * |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 592 | * The only safe way to check for the pen up condition is in the |
| 593 | * timer by reading the pen signal state (it's a GPIO _and_ IRQ). |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 594 | */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 595 | if (Rt) { |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 596 | struct input_dev *input = ts->input; |
Imre Deak | ae82d5a | 2006-04-26 00:12:14 -0400 | [diff] [blame] | 597 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 598 | if (!ts->pendown) { |
| 599 | input_report_key(input, BTN_TOUCH, 1); |
| 600 | ts->pendown = 1; |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 601 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 602 | } |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 603 | |
| 604 | if (ts->swap_xy) |
| 605 | swap(x, y); |
| 606 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 607 | input_report_abs(input, ABS_X, x); |
| 608 | input_report_abs(input, ABS_Y, y); |
Pavel Machek | 30ad7ba | 2009-11-23 08:17:38 -0800 | [diff] [blame] | 609 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 610 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 611 | input_sync(input); |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 612 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 613 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 614 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 615 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), |
| 616 | HRTIMER_MODE_REL); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 617 | } |
| 618 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 619 | static int ads7846_debounce(void *ads, int data_idx, int *val) |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 620 | { |
| 621 | struct ads7846 *ts = ads; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 622 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 623 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
| 624 | /* Start over collecting consistent readings. */ |
| 625 | ts->read_rep = 0; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 626 | /* Repeat it, if this was the first read or the read |
| 627 | * wasn't consistent enough. */ |
| 628 | if (ts->read_cnt < ts->debounce_max) { |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 629 | ts->last_read = *val; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 630 | ts->read_cnt++; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 631 | return ADS7846_FILTER_REPEAT; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 632 | } else { |
| 633 | /* Maximum number of debouncing reached and still |
| 634 | * not enough number of consistent readings. Abort |
| 635 | * the whole sample, repeat it in the next sampling |
| 636 | * period. |
| 637 | */ |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 638 | ts->read_cnt = 0; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 639 | return ADS7846_FILTER_IGNORE; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 640 | } |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 641 | } else { |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 642 | if (++ts->read_rep > ts->debounce_rep) { |
| 643 | /* Got a good reading for this coordinate, |
| 644 | * go for the next one. */ |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 645 | ts->read_cnt = 0; |
| 646 | ts->read_rep = 0; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 647 | return ADS7846_FILTER_OK; |
| 648 | } else { |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 649 | /* Read more values that are consistent. */ |
| 650 | ts->read_cnt++; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 651 | return ADS7846_FILTER_REPEAT; |
| 652 | } |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | static int ads7846_no_filter(void *ads, int data_idx, int *val) |
| 657 | { |
| 658 | return ADS7846_FILTER_OK; |
| 659 | } |
| 660 | |
| 661 | static void ads7846_rx_val(void *ads) |
| 662 | { |
| 663 | struct ads7846 *ts = ads; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 664 | struct ads7846_packet *packet = ts->packet; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 665 | struct spi_message *m; |
| 666 | struct spi_transfer *t; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 667 | int val; |
| 668 | int action; |
| 669 | int status; |
| 670 | |
| 671 | m = &ts->msg[ts->msg_idx]; |
| 672 | t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list); |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 673 | |
| 674 | /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding; |
| 675 | * built from two 8 bit values written msb-first. |
| 676 | */ |
Harvey Harrison | 494f685 | 2008-07-23 14:16:19 -0400 | [diff] [blame] | 677 | val = be16_to_cpup((__be16 *)t->rx_buf) >> 3; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 678 | |
| 679 | action = ts->filter(ts->filter_data, ts->msg_idx, &val); |
| 680 | switch (action) { |
| 681 | case ADS7846_FILTER_REPEAT: |
| 682 | break; |
| 683 | case ADS7846_FILTER_IGNORE: |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 684 | packet->tc.ignore = 1; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 685 | /* Last message will contain ads7846_rx() as the |
| 686 | * completion function. |
| 687 | */ |
| 688 | m = ts->last_msg; |
| 689 | break; |
| 690 | case ADS7846_FILTER_OK: |
Harvey Harrison | 494f685 | 2008-07-23 14:16:19 -0400 | [diff] [blame] | 691 | *(u16 *)t->rx_buf = val; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 692 | packet->tc.ignore = 0; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 693 | m = &ts->msg[++ts->msg_idx]; |
| 694 | break; |
| 695 | default: |
| 696 | BUG(); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 697 | } |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 698 | ts->wait_for_sync(); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 699 | status = spi_async(ts->spi, m); |
| 700 | if (status) |
| 701 | dev_err(&ts->spi->dev, "spi_async --> %d\n", |
| 702 | status); |
| 703 | } |
| 704 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 705 | static enum hrtimer_restart ads7846_timer(struct hrtimer *handle) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 706 | { |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 707 | struct ads7846 *ts = container_of(handle, struct ads7846, timer); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 708 | int status = 0; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 709 | |
Peter Zijlstra | ca10949 | 2008-11-25 12:43:51 +0100 | [diff] [blame] | 710 | spin_lock(&ts->lock); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 711 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 712 | if (unlikely(!get_pendown_state(ts) || |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 713 | device_suspended(&ts->spi->dev))) { |
| 714 | if (ts->pendown) { |
| 715 | struct input_dev *input = ts->input; |
| 716 | |
| 717 | input_report_key(input, BTN_TOUCH, 0); |
| 718 | input_report_abs(input, ABS_PRESSURE, 0); |
| 719 | input_sync(input); |
| 720 | |
| 721 | ts->pendown = 0; |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 722 | dev_vdbg(&ts->spi->dev, "UP\n"); |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 723 | } |
| 724 | |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 725 | /* measurement cycle ended */ |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 726 | if (!device_suspended(&ts->spi->dev)) { |
| 727 | ts->irq_disabled = 0; |
| 728 | enable_irq(ts->spi->irq); |
| 729 | } |
| 730 | ts->pending = 0; |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 731 | } else { |
| 732 | /* pen is still down, continue with the measurement */ |
| 733 | ts->msg_idx = 0; |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 734 | ts->wait_for_sync(); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 735 | status = spi_async(ts->spi, &ts->msg[0]); |
| 736 | if (status) |
| 737 | dev_err(&ts->spi->dev, "spi_async --> %d\n", status); |
| 738 | } |
| 739 | |
Peter Zijlstra | ca10949 | 2008-11-25 12:43:51 +0100 | [diff] [blame] | 740 | spin_unlock(&ts->lock); |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 741 | return HRTIMER_NORESTART; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 742 | } |
| 743 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 744 | static irqreturn_t ads7846_irq(int irq, void *handle) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 745 | { |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 746 | struct ads7846 *ts = handle; |
| 747 | unsigned long flags; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 748 | |
| 749 | spin_lock_irqsave(&ts->lock, flags); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 750 | if (likely(get_pendown_state(ts))) { |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 751 | if (!ts->irq_disabled) { |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 752 | /* The ARM do_simple_IRQ() dispatcher doesn't act |
| 753 | * like the other dispatchers: it will report IRQs |
| 754 | * even after they've been disabled. We work around |
| 755 | * that here. (The "generic irq" framework may help...) |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 756 | */ |
| 757 | ts->irq_disabled = 1; |
Ben Nizette | 3f3e7c6 | 2009-04-15 18:57:55 -0700 | [diff] [blame] | 758 | disable_irq_nosync(ts->spi->irq); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 759 | ts->pending = 1; |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 760 | hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 761 | HRTIMER_MODE_REL); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 762 | } |
| 763 | } |
| 764 | spin_unlock_irqrestore(&ts->lock, flags); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 765 | |
| 766 | return IRQ_HANDLED; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | /*--------------------------------------------------------------------------*/ |
| 770 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 771 | /* Must be called with ts->lock held */ |
| 772 | static void ads7846_disable(struct ads7846 *ts) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 773 | { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 774 | if (ts->disabled) |
| 775 | return; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 776 | |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 777 | ts->disabled = 1; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 778 | |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 779 | /* are we waiting for IRQ, or polling? */ |
| 780 | if (!ts->pending) { |
| 781 | ts->irq_disabled = 1; |
| 782 | disable_irq(ts->spi->irq); |
| 783 | } else { |
| 784 | /* the timer will run at least once more, and |
| 785 | * leave everything in a clean state, IRQ disabled |
| 786 | */ |
| 787 | while (ts->pending) { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 788 | spin_unlock_irq(&ts->lock); |
Juha Yrjola | c4febb9 | 2006-04-11 23:42:25 -0400 | [diff] [blame] | 789 | msleep(1); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 790 | spin_lock_irq(&ts->lock); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 791 | } |
| 792 | } |
| 793 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 794 | regulator_disable(ts->reg); |
| 795 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 796 | /* we know the chip's in lowpower mode since we always |
| 797 | * leave it that way after every request |
| 798 | */ |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | /* Must be called with ts->lock held */ |
| 802 | static void ads7846_enable(struct ads7846 *ts) |
| 803 | { |
| 804 | if (!ts->disabled) |
| 805 | return; |
| 806 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 807 | regulator_enable(ts->reg); |
| 808 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 809 | ts->disabled = 0; |
| 810 | ts->irq_disabled = 0; |
| 811 | enable_irq(ts->spi->irq); |
| 812 | } |
| 813 | |
| 814 | static int ads7846_suspend(struct spi_device *spi, pm_message_t message) |
| 815 | { |
| 816 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
| 817 | |
| 818 | spin_lock_irq(&ts->lock); |
| 819 | |
David Brownell | fbb38e3 | 2007-12-14 01:26:33 -0500 | [diff] [blame] | 820 | ts->is_suspended = 1; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 821 | ads7846_disable(ts); |
| 822 | |
| 823 | spin_unlock_irq(&ts->lock); |
| 824 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 825 | if (device_may_wakeup(&ts->spi->dev)) |
| 826 | enable_irq_wake(ts->spi->irq); |
| 827 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 828 | return 0; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 829 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 830 | } |
| 831 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 832 | static int ads7846_resume(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 833 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 834 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 835 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 836 | if (device_may_wakeup(&ts->spi->dev)) |
| 837 | disable_irq_wake(ts->spi->irq); |
| 838 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 839 | spin_lock_irq(&ts->lock); |
| 840 | |
David Brownell | fbb38e3 | 2007-12-14 01:26:33 -0500 | [diff] [blame] | 841 | ts->is_suspended = 0; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 842 | ads7846_enable(ts); |
| 843 | |
| 844 | spin_unlock_irq(&ts->lock); |
| 845 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 846 | return 0; |
| 847 | } |
| 848 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 849 | static int __devinit setup_pendown(struct spi_device *spi, struct ads7846 *ts) |
| 850 | { |
| 851 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
| 852 | int err; |
| 853 | |
| 854 | /* REVISIT when the irq can be triggered active-low, or if for some |
| 855 | * reason the touchscreen isn't hooked up, we don't need to access |
| 856 | * the pendown state. |
| 857 | */ |
| 858 | if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) { |
| 859 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); |
| 860 | return -EINVAL; |
| 861 | } |
| 862 | |
| 863 | if (pdata->get_pendown_state) { |
| 864 | ts->get_pendown_state = pdata->get_pendown_state; |
| 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | err = gpio_request(pdata->gpio_pendown, "ads7846_pendown"); |
| 869 | if (err) { |
| 870 | dev_err(&spi->dev, "failed to request pendown GPIO%d\n", |
| 871 | pdata->gpio_pendown); |
| 872 | return err; |
| 873 | } |
| 874 | |
| 875 | ts->gpio_pendown = pdata->gpio_pendown; |
| 876 | return 0; |
| 877 | } |
| 878 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 879 | static int __devinit ads7846_probe(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 880 | { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 881 | struct ads7846 *ts; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 882 | struct ads7846_packet *packet; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 883 | struct input_dev *input_dev; |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 884 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 885 | struct spi_message *m; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 886 | struct spi_transfer *x; |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 887 | int vref; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 888 | int err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 889 | |
| 890 | if (!spi->irq) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 891 | dev_dbg(&spi->dev, "no IRQ?\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 892 | return -ENODEV; |
| 893 | } |
| 894 | |
| 895 | if (!pdata) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 896 | dev_dbg(&spi->dev, "no platform data?\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 897 | return -ENODEV; |
| 898 | } |
| 899 | |
| 900 | /* don't exceed max specified sample rate */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 901 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 902 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 903 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 904 | return -EINVAL; |
| 905 | } |
| 906 | |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 907 | /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except |
| 908 | * that even if the hardware can do that, the SPI controller driver |
| 909 | * may not. So we stick to very-portable 8 bit words, both RX and TX. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 910 | */ |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 911 | spi->bits_per_word = 8; |
Semih Hazar | 230ffc8 | 2007-05-22 23:35:12 -0400 | [diff] [blame] | 912 | spi->mode = SPI_MODE_0; |
Imre Deak | 7937e86 | 2007-01-18 00:45:38 -0500 | [diff] [blame] | 913 | err = spi_setup(spi); |
| 914 | if (err < 0) |
| 915 | return err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 916 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 917 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 918 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 919 | input_dev = input_allocate_device(); |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 920 | if (!ts || !packet || !input_dev) { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 921 | err = -ENOMEM; |
| 922 | goto err_free_mem; |
| 923 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 924 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 925 | dev_set_drvdata(&spi->dev, ts); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 926 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 927 | ts->packet = packet; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 928 | ts->spi = spi; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 929 | ts->input = input_dev; |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 930 | ts->vref_mv = pdata->vref_mv; |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 931 | ts->swap_xy = pdata->swap_xy; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 932 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 933 | hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 934 | ts->timer.function = ads7846_timer; |
| 935 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 936 | spin_lock_init(&ts->lock); |
| 937 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 938 | ts->model = pdata->model ? : 7846; |
| 939 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; |
| 940 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 941 | ts->pressure_max = pdata->pressure_max ? : ~0; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 942 | |
| 943 | if (pdata->filter != NULL) { |
| 944 | if (pdata->filter_init != NULL) { |
| 945 | err = pdata->filter_init(pdata, &ts->filter_data); |
| 946 | if (err < 0) |
| 947 | goto err_free_mem; |
| 948 | } |
| 949 | ts->filter = pdata->filter; |
| 950 | ts->filter_cleanup = pdata->filter_cleanup; |
| 951 | } else if (pdata->debounce_max) { |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 952 | ts->debounce_max = pdata->debounce_max; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 953 | if (ts->debounce_max < 2) |
| 954 | ts->debounce_max = 2; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 955 | ts->debounce_tol = pdata->debounce_tol; |
| 956 | ts->debounce_rep = pdata->debounce_rep; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 957 | ts->filter = ads7846_debounce; |
| 958 | ts->filter_data = ts; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 959 | } else |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 960 | ts->filter = ads7846_no_filter; |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 961 | |
| 962 | err = setup_pendown(spi, ts); |
| 963 | if (err) |
| 964 | goto err_cleanup_filter; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 965 | |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 966 | if (pdata->penirq_recheck_delay_usecs) |
| 967 | ts->penirq_recheck_delay_usecs = |
| 968 | pdata->penirq_recheck_delay_usecs; |
| 969 | |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 970 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; |
| 971 | |
Kay Sievers | a6c2490 | 2008-10-30 00:07:50 -0400 | [diff] [blame] | 972 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); |
Michael Roth | b58895f | 2009-05-18 16:05:12 -0700 | [diff] [blame] | 973 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 974 | |
Michael Roth | b58895f | 2009-05-18 16:05:12 -0700 | [diff] [blame] | 975 | input_dev->name = ts->name; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 976 | input_dev->phys = ts->phys; |
Dmitry Torokhov | a5394fb0 | 2007-04-12 01:35:14 -0400 | [diff] [blame] | 977 | input_dev->dev.parent = &spi->dev; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 978 | |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 979 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 980 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 981 | input_set_abs_params(input_dev, ABS_X, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 982 | pdata->x_min ? : 0, |
| 983 | pdata->x_max ? : MAX_12BIT, |
| 984 | 0, 0); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 985 | input_set_abs_params(input_dev, ABS_Y, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 986 | pdata->y_min ? : 0, |
| 987 | pdata->y_max ? : MAX_12BIT, |
| 988 | 0, 0); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 989 | input_set_abs_params(input_dev, ABS_PRESSURE, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 990 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
| 991 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 992 | vref = pdata->keep_vref_on; |
| 993 | |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 994 | if (ts->model == 7873) { |
| 995 | /* The AD7873 is almost identical to the ADS7846 |
| 996 | * keep VREF off during differential/ratiometric |
| 997 | * conversion modes |
| 998 | */ |
| 999 | ts->model = 7846; |
| 1000 | vref = 0; |
| 1001 | } |
| 1002 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1003 | /* set up the transfers to read touchscreen state; this assumes we |
| 1004 | * use formula #2 for pressure, not #3. |
| 1005 | */ |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1006 | m = &ts->msg[0]; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1007 | x = ts->xfer; |
| 1008 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1009 | spi_message_init(m); |
| 1010 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1011 | /* y- still on; turn on only y+ (and ADC) */ |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1012 | packet->read_y = READ_Y(vref); |
| 1013 | x->tx_buf = &packet->read_y; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1014 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1015 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1016 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1017 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1018 | x->rx_buf = &packet->tc.y; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1019 | x->len = 2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1020 | spi_message_add_tail(x, m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1021 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1022 | /* the first sample after switching drivers can be low quality; |
| 1023 | * optionally discard it, using a second one after the signals |
| 1024 | * have had enough time to stabilize. |
| 1025 | */ |
| 1026 | if (pdata->settle_delay_usecs) { |
| 1027 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1028 | |
| 1029 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1030 | x->tx_buf = &packet->read_y; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1031 | x->len = 1; |
| 1032 | spi_message_add_tail(x, m); |
| 1033 | |
| 1034 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1035 | x->rx_buf = &packet->tc.y; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1036 | x->len = 2; |
| 1037 | spi_message_add_tail(x, m); |
| 1038 | } |
| 1039 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1040 | m->complete = ads7846_rx_val; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1041 | m->context = ts; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1042 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1043 | m++; |
| 1044 | spi_message_init(m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1045 | |
| 1046 | /* turn y- off, x+ on, then leave in lowpower */ |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1047 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1048 | packet->read_x = READ_X(vref); |
| 1049 | x->tx_buf = &packet->read_x; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1050 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1051 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1052 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1053 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1054 | x->rx_buf = &packet->tc.x; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1055 | x->len = 2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1056 | spi_message_add_tail(x, m); |
| 1057 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1058 | /* ... maybe discard first sample ... */ |
| 1059 | if (pdata->settle_delay_usecs) { |
| 1060 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1061 | |
| 1062 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1063 | x->tx_buf = &packet->read_x; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1064 | x->len = 1; |
| 1065 | spi_message_add_tail(x, m); |
| 1066 | |
| 1067 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1068 | x->rx_buf = &packet->tc.x; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1069 | x->len = 2; |
| 1070 | spi_message_add_tail(x, m); |
| 1071 | } |
| 1072 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1073 | m->complete = ads7846_rx_val; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1074 | m->context = ts; |
| 1075 | |
| 1076 | /* turn y+ off, x- on; we'll use formula #2 */ |
| 1077 | if (ts->model == 7846) { |
| 1078 | m++; |
| 1079 | spi_message_init(m); |
| 1080 | |
| 1081 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1082 | packet->read_z1 = READ_Z1(vref); |
| 1083 | x->tx_buf = &packet->read_z1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1084 | x->len = 1; |
| 1085 | spi_message_add_tail(x, m); |
| 1086 | |
| 1087 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1088 | x->rx_buf = &packet->tc.z1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1089 | x->len = 2; |
| 1090 | spi_message_add_tail(x, m); |
| 1091 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1092 | /* ... maybe discard first sample ... */ |
| 1093 | if (pdata->settle_delay_usecs) { |
| 1094 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1095 | |
| 1096 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1097 | x->tx_buf = &packet->read_z1; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1098 | x->len = 1; |
| 1099 | spi_message_add_tail(x, m); |
| 1100 | |
| 1101 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1102 | x->rx_buf = &packet->tc.z1; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1103 | x->len = 2; |
| 1104 | spi_message_add_tail(x, m); |
| 1105 | } |
| 1106 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1107 | m->complete = ads7846_rx_val; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1108 | m->context = ts; |
| 1109 | |
| 1110 | m++; |
| 1111 | spi_message_init(m); |
| 1112 | |
| 1113 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1114 | packet->read_z2 = READ_Z2(vref); |
| 1115 | x->tx_buf = &packet->read_z2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1116 | x->len = 1; |
| 1117 | spi_message_add_tail(x, m); |
| 1118 | |
| 1119 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1120 | x->rx_buf = &packet->tc.z2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1121 | x->len = 2; |
| 1122 | spi_message_add_tail(x, m); |
| 1123 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1124 | /* ... maybe discard first sample ... */ |
| 1125 | if (pdata->settle_delay_usecs) { |
| 1126 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1127 | |
| 1128 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1129 | x->tx_buf = &packet->read_z2; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1130 | x->len = 1; |
| 1131 | spi_message_add_tail(x, m); |
| 1132 | |
| 1133 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1134 | x->rx_buf = &packet->tc.z2; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1135 | x->len = 2; |
| 1136 | spi_message_add_tail(x, m); |
| 1137 | } |
| 1138 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1139 | m->complete = ads7846_rx_val; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1140 | m->context = ts; |
| 1141 | } |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1142 | |
| 1143 | /* power down */ |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1144 | m++; |
| 1145 | spi_message_init(m); |
| 1146 | |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1147 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1148 | packet->pwrdown = PWRDOWN; |
| 1149 | x->tx_buf = &packet->pwrdown; |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1150 | x->len = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1151 | spi_message_add_tail(x, m); |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1152 | |
| 1153 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1154 | x->rx_buf = &packet->dummy; |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1155 | x->len = 2; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1156 | CS_CHANGE(*x); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1157 | spi_message_add_tail(x, m); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1158 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1159 | m->complete = ads7846_rx; |
| 1160 | m->context = ts; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1161 | |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 1162 | ts->last_msg = m; |
| 1163 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1164 | ts->reg = regulator_get(&spi->dev, "vcc"); |
| 1165 | if (IS_ERR(ts->reg)) { |
Kevin Hilman | 067fb2f | 2010-05-26 23:30:55 -0700 | [diff] [blame^] | 1166 | err = PTR_ERR(ts->reg); |
| 1167 | dev_err(&spi->dev, "unable to get regulator: %ld\n", err); |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1168 | goto err_free_gpio; |
| 1169 | } |
| 1170 | |
| 1171 | err = regulator_enable(ts->reg); |
| 1172 | if (err) { |
| 1173 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); |
| 1174 | goto err_put_regulator; |
| 1175 | } |
| 1176 | |
Thomas Gleixner | dace145 | 2006-07-01 19:29:38 -0700 | [diff] [blame] | 1177 | if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING, |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 1178 | spi->dev.driver->name, ts)) { |
Michael Roth | c57c0a2 | 2009-06-10 23:30:55 -0700 | [diff] [blame] | 1179 | dev_info(&spi->dev, |
| 1180 | "trying pin change workaround on irq %d\n", spi->irq); |
| 1181 | err = request_irq(spi->irq, ads7846_irq, |
| 1182 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 1183 | spi->dev.driver->name, ts); |
| 1184 | if (err) { |
| 1185 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1186 | goto err_disable_regulator; |
Michael Roth | c57c0a2 | 2009-06-10 23:30:55 -0700 | [diff] [blame] | 1187 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1188 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1189 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1190 | err = ads784x_hwmon_register(spi, ts); |
| 1191 | if (err) |
| 1192 | goto err_free_irq; |
| 1193 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1194 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1195 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1196 | /* take a first sample, leaving nPENIRQ active and vREF off; avoid |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1197 | * the touchscreen, in case it's not connected. |
| 1198 | */ |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1199 | (void) ads7846_read12_ser(&spi->dev, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1200 | READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON); |
| 1201 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1202 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1203 | if (err) |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1204 | goto err_remove_hwmon; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1205 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1206 | err = input_register_device(input_dev); |
| 1207 | if (err) |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1208 | goto err_remove_attr_group; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1209 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 1210 | device_init_wakeup(&spi->dev, pdata->wakeup); |
| 1211 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1212 | return 0; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1213 | |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1214 | err_remove_attr_group: |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1215 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
| 1216 | err_remove_hwmon: |
| 1217 | ads784x_hwmon_unregister(spi, ts); |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1218 | err_free_irq: |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1219 | free_irq(spi->irq, ts); |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1220 | err_disable_regulator: |
| 1221 | regulator_disable(ts->reg); |
| 1222 | err_put_regulator: |
| 1223 | regulator_put(ts->reg); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1224 | err_free_gpio: |
| 1225 | if (ts->gpio_pendown != -1) |
| 1226 | gpio_free(ts->gpio_pendown); |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1227 | err_cleanup_filter: |
| 1228 | if (ts->filter_cleanup) |
| 1229 | ts->filter_cleanup(ts->filter_data); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1230 | err_free_mem: |
| 1231 | input_free_device(input_dev); |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1232 | kfree(packet); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1233 | kfree(ts); |
| 1234 | return err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1235 | } |
| 1236 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1237 | static int __devexit ads7846_remove(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1238 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1239 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1240 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 1241 | device_init_wakeup(&spi->dev, false); |
| 1242 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1243 | ads784x_hwmon_unregister(spi, ts); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1244 | input_unregister_device(ts->input); |
| 1245 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1246 | ads7846_suspend(spi, PMSG_SUSPEND); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1247 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1248 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1249 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1250 | free_irq(ts->spi->irq, ts); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 1251 | /* suspend left the IRQ disabled */ |
| 1252 | enable_irq(ts->spi->irq); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1253 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1254 | regulator_disable(ts->reg); |
| 1255 | regulator_put(ts->reg); |
| 1256 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1257 | if (ts->gpio_pendown != -1) |
| 1258 | gpio_free(ts->gpio_pendown); |
| 1259 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1260 | if (ts->filter_cleanup) |
| 1261 | ts->filter_cleanup(ts->filter_data); |
| 1262 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1263 | kfree(ts->packet); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1264 | kfree(ts); |
| 1265 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1266 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1267 | return 0; |
| 1268 | } |
| 1269 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1270 | static struct spi_driver ads7846_driver = { |
| 1271 | .driver = { |
| 1272 | .name = "ads7846", |
| 1273 | .bus = &spi_bus_type, |
| 1274 | .owner = THIS_MODULE, |
| 1275 | }, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1276 | .probe = ads7846_probe, |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1277 | .remove = __devexit_p(ads7846_remove), |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1278 | .suspend = ads7846_suspend, |
| 1279 | .resume = ads7846_resume, |
| 1280 | }; |
| 1281 | |
| 1282 | static int __init ads7846_init(void) |
| 1283 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1284 | return spi_register_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1285 | } |
| 1286 | module_init(ads7846_init); |
| 1287 | |
| 1288 | static void __exit ads7846_exit(void) |
| 1289 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1290 | spi_unregister_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1291 | } |
| 1292 | module_exit(ads7846_exit); |
| 1293 | |
| 1294 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); |
| 1295 | MODULE_LICENSE("GPL"); |
Anton Vorontsov | e0626e3 | 2009-09-22 16:46:08 -0700 | [diff] [blame] | 1296 | MODULE_ALIAS("spi:ads7846"); |