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 | */ |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 20 | #include <linux/types.h> |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 21 | #include <linux/hwmon.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 22 | #include <linux/init.h> |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 23 | #include <linux/err.h> |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 24 | #include <linux/sched.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 25 | #include <linux/delay.h> |
| 26 | #include <linux/input.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/slab.h> |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 29 | #include <linux/pm.h> |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 30 | #include <linux/gpio.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 31 | #include <linux/spi/spi.h> |
| 32 | #include <linux/spi/ads7846.h> |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 33 | #include <linux/regulator/consumer.h> |
Andrew Morton | 3ac8bf0 | 2006-03-26 01:37:33 -0800 | [diff] [blame] | 34 | #include <asm/irq.h> |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 35 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 36 | /* |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 37 | * This code has been heavily tested on a Nokia 770, and lightly |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 38 | * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz). |
David Brownell | bff0de5 | 2007-05-22 23:28:40 -0400 | [diff] [blame] | 39 | * TSC2046 is just newer ads7846 silicon. |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 40 | * Support for ads7843 tested on Atmel at91sam926x-EK. |
| 41 | * Support for ads7845 has only been stubbed in. |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 42 | * Support for Analog Devices AD7873 and AD7843 tested. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 43 | * |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 44 | * IRQ handling needs a workaround because of a shortcoming in handling |
| 45 | * edge triggered IRQs on some platforms like the OMAP1/2. These |
| 46 | * platforms don't handle the ARM lazy IRQ disabling properly, thus we |
| 47 | * have to maintain our own SW IRQ disabled status. This should be |
| 48 | * removed as soon as the affected platform's IRQ handling is fixed. |
| 49 | * |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 50 | * App note sbaa036 talks in more detail about accurate sampling... |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 51 | * that ought to help in situations like LCDs inducing noise (which |
| 52 | * can also be helped by using synch signals) and more generally. |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 53 | * This driver tries to utilize the measures described in the app |
| 54 | * note. The strength of filtering can be set in the board-* specific |
| 55 | * files. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 56 | */ |
| 57 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 58 | #define TS_POLL_DELAY 1 /* ms delay before the first sample */ |
| 59 | #define TS_POLL_PERIOD 5 /* ms delay between samples */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 60 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 61 | /* this driver doesn't aim at the peak continuous sample rate */ |
| 62 | #define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */) |
| 63 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 64 | struct ts_event { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 65 | /* |
| 66 | * For portability, we can't read 12 bit values using SPI (which |
| 67 | * would make the controller deliver them as native byte order u16 |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 68 | * with msbs zeroed). Instead, we read them as two 8-bit values, |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 69 | * *** WHICH NEED BYTESWAPPING *** and range adjustment. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 70 | */ |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 71 | u16 x; |
| 72 | u16 y; |
| 73 | u16 z1, z2; |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 74 | bool ignore; |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 75 | u8 x_buf[3]; |
| 76 | u8 y_buf[3]; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 77 | }; |
| 78 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 79 | /* |
| 80 | * We allocate this separately to avoid cache line sharing issues when |
| 81 | * driver is used with DMA-based SPI controllers (like atmel_spi) on |
| 82 | * systems where main memory is not DMA-coherent (most non-x86 boards). |
| 83 | */ |
| 84 | struct ads7846_packet { |
| 85 | u8 read_x, read_y, read_z1, read_z2, pwrdown; |
| 86 | u16 dummy; /* for the pwrdown read */ |
| 87 | struct ts_event tc; |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 88 | /* for ads7845 with mpc5121 psc spi we use 3-byte buffers */ |
| 89 | u8 read_x_cmd[3], read_y_cmd[3], pwrdown_cmd[3]; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 90 | }; |
| 91 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 92 | struct ads7846 { |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 93 | struct input_dev *input; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 94 | char phys[32]; |
Michael Roth | b58895f | 2009-05-18 16:05:12 -0700 | [diff] [blame] | 95 | char name[32]; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 96 | |
| 97 | struct spi_device *spi; |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 98 | struct regulator *reg; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 99 | |
| 100 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 101 | struct attribute_group *attr_group; |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 102 | struct device *hwmon; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 103 | #endif |
| 104 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 105 | u16 model; |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 106 | u16 vref_mv; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 107 | u16 vref_delay_usecs; |
| 108 | u16 x_plate_ohms; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 109 | u16 pressure_max; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 110 | |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 111 | bool swap_xy; |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 112 | bool use_internal; |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 113 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 114 | struct ads7846_packet *packet; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 115 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 116 | struct spi_transfer xfer[18]; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 117 | struct spi_message msg[5]; |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 118 | int msg_count; |
| 119 | wait_queue_head_t wait; |
| 120 | |
| 121 | bool pendown; |
| 122 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 123 | int read_cnt; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 124 | int read_rep; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 125 | int last_read; |
| 126 | |
| 127 | u16 debounce_max; |
| 128 | u16 debounce_tol; |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 129 | u16 debounce_rep; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 130 | |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 131 | u16 penirq_recheck_delay_usecs; |
| 132 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 133 | struct mutex lock; |
| 134 | bool stopped; /* P: lock */ |
| 135 | bool disabled; /* P: lock */ |
| 136 | bool suspended; /* P: lock */ |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 137 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 138 | int (*filter)(void *data, int data_idx, int *val); |
| 139 | void *filter_data; |
| 140 | void (*filter_cleanup)(void *data); |
Imre Deak | c9e617a | 2006-04-11 23:44:05 -0400 | [diff] [blame] | 141 | int (*get_pendown_state)(void); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 142 | int gpio_pendown; |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 143 | |
| 144 | void (*wait_for_sync)(void); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 145 | }; |
| 146 | |
| 147 | /* leave chip selected when we're done, for quicker re-select? */ |
| 148 | #if 0 |
| 149 | #define CS_CHANGE(xfer) ((xfer).cs_change = 1) |
| 150 | #else |
| 151 | #define CS_CHANGE(xfer) ((xfer).cs_change = 0) |
| 152 | #endif |
| 153 | |
| 154 | /*--------------------------------------------------------------------------*/ |
| 155 | |
| 156 | /* The ADS7846 has touchscreen and other sensors. |
| 157 | * Earlier ads784x chips are somewhat compatible. |
| 158 | */ |
| 159 | #define ADS_START (1 << 7) |
| 160 | #define ADS_A2A1A0_d_y (1 << 4) /* differential */ |
| 161 | #define ADS_A2A1A0_d_z1 (3 << 4) /* differential */ |
| 162 | #define ADS_A2A1A0_d_z2 (4 << 4) /* differential */ |
| 163 | #define ADS_A2A1A0_d_x (5 << 4) /* differential */ |
| 164 | #define ADS_A2A1A0_temp0 (0 << 4) /* non-differential */ |
| 165 | #define ADS_A2A1A0_vbatt (2 << 4) /* non-differential */ |
| 166 | #define ADS_A2A1A0_vaux (6 << 4) /* non-differential */ |
| 167 | #define ADS_A2A1A0_temp1 (7 << 4) /* non-differential */ |
| 168 | #define ADS_8_BIT (1 << 3) |
| 169 | #define ADS_12_BIT (0 << 3) |
| 170 | #define ADS_SER (1 << 2) /* non-differential */ |
| 171 | #define ADS_DFR (0 << 2) /* differential */ |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 172 | #define ADS_PD10_PDOWN (0 << 0) /* low power mode + penirq */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 173 | #define ADS_PD10_ADC_ON (1 << 0) /* ADC on */ |
| 174 | #define ADS_PD10_REF_ON (2 << 0) /* vREF on + penirq */ |
| 175 | #define ADS_PD10_ALL_ON (3 << 0) /* ADC + vREF on */ |
| 176 | |
| 177 | #define MAX_12BIT ((1<<12)-1) |
| 178 | |
| 179 | /* leave ADC powered up (disables penirq) between differential samples */ |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 180 | #define READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \ |
| 181 | | ADS_12_BIT | ADS_DFR | \ |
| 182 | (adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0)) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 183 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 184 | #define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref)) |
| 185 | #define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref)) |
| 186 | #define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref)) |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 187 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 188 | #define READ_X(vref) (READ_12BIT_DFR(x, 1, vref)) |
| 189 | #define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 190 | |
| 191 | /* single-ended samples need to first power up reference voltage; |
| 192 | * we leave both ADC and VREF powered |
| 193 | */ |
| 194 | #define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \ |
| 195 | | ADS_12_BIT | ADS_SER) |
| 196 | |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 197 | #define REF_ON (READ_12BIT_DFR(x, 1, 1)) |
| 198 | #define REF_OFF (READ_12BIT_DFR(y, 0, 0)) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 199 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 200 | /* Must be called with ts->lock held */ |
| 201 | static void ads7846_stop(struct ads7846 *ts) |
| 202 | { |
| 203 | if (!ts->disabled && !ts->suspended) { |
| 204 | /* Signal IRQ thread to stop polling and disable the handler. */ |
| 205 | ts->stopped = true; |
| 206 | mb(); |
| 207 | wake_up(&ts->wait); |
| 208 | disable_irq(ts->spi->irq); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* Must be called with ts->lock held */ |
| 213 | static void ads7846_restart(struct ads7846 *ts) |
| 214 | { |
| 215 | if (!ts->disabled && !ts->suspended) { |
| 216 | /* Tell IRQ thread that it may poll the device. */ |
| 217 | ts->stopped = false; |
| 218 | mb(); |
| 219 | enable_irq(ts->spi->irq); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Must be called with ts->lock held */ |
| 224 | static void __ads7846_disable(struct ads7846 *ts) |
| 225 | { |
| 226 | ads7846_stop(ts); |
| 227 | regulator_disable(ts->reg); |
| 228 | |
| 229 | /* |
| 230 | * We know the chip's in low power mode since we always |
| 231 | * leave it that way after every request |
| 232 | */ |
| 233 | } |
| 234 | |
| 235 | /* Must be called with ts->lock held */ |
| 236 | static void __ads7846_enable(struct ads7846 *ts) |
| 237 | { |
| 238 | regulator_enable(ts->reg); |
| 239 | ads7846_restart(ts); |
| 240 | } |
| 241 | |
| 242 | static void ads7846_disable(struct ads7846 *ts) |
| 243 | { |
| 244 | mutex_lock(&ts->lock); |
| 245 | |
| 246 | if (!ts->disabled) { |
| 247 | |
| 248 | if (!ts->suspended) |
| 249 | __ads7846_disable(ts); |
| 250 | |
| 251 | ts->disabled = true; |
| 252 | } |
| 253 | |
| 254 | mutex_unlock(&ts->lock); |
| 255 | } |
| 256 | |
| 257 | static void ads7846_enable(struct ads7846 *ts) |
| 258 | { |
| 259 | mutex_lock(&ts->lock); |
| 260 | |
| 261 | if (ts->disabled) { |
| 262 | |
| 263 | ts->disabled = false; |
| 264 | |
| 265 | if (!ts->suspended) |
| 266 | __ads7846_enable(ts); |
| 267 | } |
| 268 | |
| 269 | mutex_unlock(&ts->lock); |
| 270 | } |
| 271 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 272 | /*--------------------------------------------------------------------------*/ |
| 273 | |
| 274 | /* |
| 275 | * Non-touchscreen sensors only use single-ended conversions. |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 276 | * The range is GND..vREF. The ads7843 and ads7835 must use external vREF; |
| 277 | * ads7846 lets that pin be unconnected, to use internal vREF. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 278 | */ |
| 279 | |
| 280 | struct ser_req { |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 281 | u8 ref_on; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 282 | u8 command; |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 283 | u8 ref_off; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 284 | u16 scratch; |
| 285 | __be16 sample; |
| 286 | struct spi_message msg; |
| 287 | struct spi_transfer xfer[6]; |
| 288 | }; |
| 289 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 290 | struct ads7845_ser_req { |
| 291 | u8 command[3]; |
| 292 | u8 pwrdown[3]; |
| 293 | u8 sample[3]; |
| 294 | struct spi_message msg; |
| 295 | struct spi_transfer xfer[2]; |
| 296 | }; |
| 297 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 298 | static int ads7846_read12_ser(struct device *dev, unsigned command) |
| 299 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 300 | struct spi_device *spi = to_spi_device(dev); |
| 301 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 302 | struct ser_req *req; |
| 303 | int status; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 304 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 305 | req = kzalloc(sizeof *req, GFP_KERNEL); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 306 | if (!req) |
| 307 | return -ENOMEM; |
| 308 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 309 | spi_message_init(&req->msg); |
Vitaly Wool | 8275c64 | 2006-01-08 13:34:28 -0800 | [diff] [blame] | 310 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 311 | /* maybe turn on internal vREF, and let it settle */ |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 312 | if (ts->use_internal) { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 313 | req->ref_on = REF_ON; |
| 314 | req->xfer[0].tx_buf = &req->ref_on; |
| 315 | req->xfer[0].len = 1; |
| 316 | spi_message_add_tail(&req->xfer[0], &req->msg); |
| 317 | |
| 318 | req->xfer[1].rx_buf = &req->scratch; |
| 319 | req->xfer[1].len = 2; |
| 320 | |
| 321 | /* for 1uF, settle for 800 usec; no cap, 100 usec. */ |
| 322 | req->xfer[1].delay_usecs = ts->vref_delay_usecs; |
| 323 | spi_message_add_tail(&req->xfer[1], &req->msg); |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 324 | |
| 325 | /* Enable reference voltage */ |
| 326 | command |= ADS_PD10_REF_ON; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 327 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 328 | |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 329 | /* Enable ADC in every case */ |
| 330 | command |= ADS_PD10_ADC_ON; |
| 331 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 332 | /* take sample */ |
| 333 | req->command = (u8) command; |
| 334 | req->xfer[2].tx_buf = &req->command; |
| 335 | req->xfer[2].len = 1; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 336 | spi_message_add_tail(&req->xfer[2], &req->msg); |
| 337 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 338 | req->xfer[3].rx_buf = &req->sample; |
| 339 | req->xfer[3].len = 2; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 340 | spi_message_add_tail(&req->xfer[3], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 341 | |
| 342 | /* REVISIT: take a few more samples, and compare ... */ |
| 343 | |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 344 | /* converter in low power mode & enable PENIRQ */ |
| 345 | req->ref_off = PWRDOWN; |
| 346 | req->xfer[4].tx_buf = &req->ref_off; |
| 347 | req->xfer[4].len = 1; |
| 348 | spi_message_add_tail(&req->xfer[4], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 349 | |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 350 | req->xfer[5].rx_buf = &req->scratch; |
| 351 | req->xfer[5].len = 2; |
| 352 | CS_CHANGE(req->xfer[5]); |
| 353 | spi_message_add_tail(&req->xfer[5], &req->msg); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 354 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 355 | mutex_lock(&ts->lock); |
| 356 | ads7846_stop(ts); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 357 | status = spi_sync(spi, &req->msg); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 358 | ads7846_restart(ts); |
| 359 | mutex_unlock(&ts->lock); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 360 | |
Marc Pignat | c24b260 | 2007-12-04 23:45:11 -0800 | [diff] [blame] | 361 | if (status == 0) { |
| 362 | /* on-wire is a must-ignore bit, a BE12 value, then padding */ |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 363 | status = be16_to_cpu(req->sample); |
| 364 | status = status >> 3; |
| 365 | status &= 0x0fff; |
Marc Pignat | c24b260 | 2007-12-04 23:45:11 -0800 | [diff] [blame] | 366 | } |
David Brownell | 9084533 | 2006-05-25 18:44:20 -0700 | [diff] [blame] | 367 | |
| 368 | kfree(req); |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 369 | return status; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 370 | } |
| 371 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 372 | static int ads7845_read12_ser(struct device *dev, unsigned command) |
| 373 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 374 | struct spi_device *spi = to_spi_device(dev); |
| 375 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 376 | struct ads7845_ser_req *req; |
| 377 | int status; |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 378 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 379 | req = kzalloc(sizeof *req, GFP_KERNEL); |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 380 | if (!req) |
| 381 | return -ENOMEM; |
| 382 | |
| 383 | spi_message_init(&req->msg); |
| 384 | |
| 385 | req->command[0] = (u8) command; |
| 386 | req->xfer[0].tx_buf = req->command; |
| 387 | req->xfer[0].rx_buf = req->sample; |
| 388 | req->xfer[0].len = 3; |
| 389 | spi_message_add_tail(&req->xfer[0], &req->msg); |
| 390 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 391 | mutex_lock(&ts->lock); |
| 392 | ads7846_stop(ts); |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 393 | status = spi_sync(spi, &req->msg); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 394 | ads7846_restart(ts); |
| 395 | mutex_unlock(&ts->lock); |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 396 | |
| 397 | if (status == 0) { |
| 398 | /* BE12 value, then padding */ |
| 399 | status = be16_to_cpu(*((u16 *)&req->sample[1])); |
| 400 | status = status >> 3; |
| 401 | status &= 0x0fff; |
| 402 | } |
| 403 | |
| 404 | kfree(req); |
| 405 | return status; |
| 406 | } |
| 407 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 408 | #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE) |
| 409 | |
| 410 | #define SHOW(name, var, adjust) static ssize_t \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 411 | name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ |
| 412 | { \ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 413 | struct ads7846 *ts = dev_get_drvdata(dev); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 414 | ssize_t v = ads7846_read12_ser(dev, \ |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 415 | READ_12BIT_SER(var)); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 416 | if (v < 0) \ |
| 417 | return v; \ |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 418 | return sprintf(buf, "%u\n", adjust(ts, v)); \ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 419 | } \ |
| 420 | static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); |
| 421 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 422 | |
Adam Buchbinder | b731d7b | 2009-03-13 12:15:26 -0400 | [diff] [blame] | 423 | /* Sysfs conventions report temperatures in millidegrees Celsius. |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 424 | * ADS7846 could use the low-accuracy two-sample scheme, but can't do the high |
| 425 | * accuracy scheme without calibration data. For now we won't try either; |
| 426 | * userspace sees raw sensor values, and must scale/calibrate appropriately. |
| 427 | */ |
| 428 | static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v) |
| 429 | { |
| 430 | return v; |
| 431 | } |
| 432 | |
| 433 | SHOW(temp0, temp0, null_adjust) /* temp1_input */ |
| 434 | SHOW(temp1, temp1, null_adjust) /* temp2_input */ |
| 435 | |
| 436 | |
| 437 | /* sysfs conventions report voltages in millivolts. We can convert voltages |
| 438 | * if we know vREF. userspace may need to scale vAUX to match the board's |
| 439 | * external resistors; we assume that vBATT only uses the internal ones. |
| 440 | */ |
| 441 | static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v) |
| 442 | { |
| 443 | unsigned retval = v; |
| 444 | |
| 445 | /* external resistors may scale vAUX into 0..vREF */ |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 446 | retval *= ts->vref_mv; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 447 | retval = retval >> 12; |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 448 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 449 | return retval; |
| 450 | } |
| 451 | |
| 452 | static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v) |
| 453 | { |
| 454 | unsigned retval = vaux_adjust(ts, v); |
| 455 | |
| 456 | /* ads7846 has a resistor ladder to scale this signal down */ |
| 457 | if (ts->model == 7846) |
| 458 | retval *= 4; |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 459 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 460 | return retval; |
| 461 | } |
| 462 | |
| 463 | SHOW(in0_input, vaux, vaux_adjust) |
| 464 | SHOW(in1_input, vbatt, vbatt_adjust) |
| 465 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 466 | static struct attribute *ads7846_attributes[] = { |
| 467 | &dev_attr_temp0.attr, |
| 468 | &dev_attr_temp1.attr, |
| 469 | &dev_attr_in0_input.attr, |
| 470 | &dev_attr_in1_input.attr, |
| 471 | NULL, |
| 472 | }; |
| 473 | |
| 474 | static struct attribute_group ads7846_attr_group = { |
| 475 | .attrs = ads7846_attributes, |
| 476 | }; |
| 477 | |
| 478 | static struct attribute *ads7843_attributes[] = { |
| 479 | &dev_attr_in0_input.attr, |
| 480 | &dev_attr_in1_input.attr, |
| 481 | NULL, |
| 482 | }; |
| 483 | |
| 484 | static struct attribute_group ads7843_attr_group = { |
| 485 | .attrs = ads7843_attributes, |
| 486 | }; |
| 487 | |
| 488 | static struct attribute *ads7845_attributes[] = { |
| 489 | &dev_attr_in0_input.attr, |
| 490 | NULL, |
| 491 | }; |
| 492 | |
| 493 | static struct attribute_group ads7845_attr_group = { |
| 494 | .attrs = ads7845_attributes, |
| 495 | }; |
| 496 | |
| 497 | static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts) |
| 498 | { |
Tony Jones | 1beeffe | 2007-08-20 13:46:20 -0700 | [diff] [blame] | 499 | struct device *hwmon; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 500 | int err; |
| 501 | |
| 502 | /* hwmon sensors need a reference voltage */ |
| 503 | switch (ts->model) { |
| 504 | case 7846: |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 505 | if (!ts->vref_mv) { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 506 | dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n"); |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 507 | ts->vref_mv = 2500; |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 508 | ts->use_internal = true; |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 509 | } |
| 510 | break; |
| 511 | case 7845: |
| 512 | case 7843: |
David Brownell | 7c6d0ee | 2008-04-02 00:43:01 -0400 | [diff] [blame] | 513 | if (!ts->vref_mv) { |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 514 | dev_warn(&spi->dev, |
| 515 | "external vREF for ADS%d not specified\n", |
| 516 | ts->model); |
| 517 | return 0; |
| 518 | } |
| 519 | break; |
| 520 | } |
| 521 | |
| 522 | /* different chips have different sensor groups */ |
| 523 | switch (ts->model) { |
| 524 | case 7846: |
| 525 | ts->attr_group = &ads7846_attr_group; |
| 526 | break; |
| 527 | case 7845: |
| 528 | ts->attr_group = &ads7845_attr_group; |
| 529 | break; |
| 530 | case 7843: |
| 531 | ts->attr_group = &ads7843_attr_group; |
| 532 | break; |
| 533 | default: |
| 534 | dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model); |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | err = sysfs_create_group(&spi->dev.kobj, ts->attr_group); |
| 539 | if (err) |
| 540 | return err; |
| 541 | |
| 542 | hwmon = hwmon_device_register(&spi->dev); |
| 543 | if (IS_ERR(hwmon)) { |
| 544 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); |
| 545 | return PTR_ERR(hwmon); |
| 546 | } |
| 547 | |
| 548 | ts->hwmon = hwmon; |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | static void ads784x_hwmon_unregister(struct spi_device *spi, |
| 553 | struct ads7846 *ts) |
| 554 | { |
| 555 | if (ts->hwmon) { |
| 556 | sysfs_remove_group(&spi->dev.kobj, ts->attr_group); |
| 557 | hwmon_device_unregister(ts->hwmon); |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | #else |
| 562 | static inline int ads784x_hwmon_register(struct spi_device *spi, |
| 563 | struct ads7846 *ts) |
| 564 | { |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | static inline void ads784x_hwmon_unregister(struct spi_device *spi, |
| 569 | struct ads7846 *ts) |
| 570 | { |
| 571 | } |
| 572 | #endif |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 573 | |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 574 | static ssize_t ads7846_pen_down_show(struct device *dev, |
| 575 | struct device_attribute *attr, char *buf) |
| 576 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 577 | struct ads7846 *ts = dev_get_drvdata(dev); |
| 578 | |
| 579 | return sprintf(buf, "%u\n", ts->pendown); |
Imre Deak | 438f2a7 | 2006-04-11 23:41:32 -0400 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL); |
| 583 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 584 | static ssize_t ads7846_disable_show(struct device *dev, |
| 585 | struct device_attribute *attr, char *buf) |
| 586 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 587 | struct ads7846 *ts = dev_get_drvdata(dev); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 588 | |
| 589 | return sprintf(buf, "%u\n", ts->disabled); |
| 590 | } |
| 591 | |
| 592 | static ssize_t ads7846_disable_store(struct device *dev, |
| 593 | struct device_attribute *attr, |
| 594 | const char *buf, size_t count) |
| 595 | { |
| 596 | struct ads7846 *ts = dev_get_drvdata(dev); |
Harvey Harrison | 3a0c58d | 2008-12-23 04:09:28 -0500 | [diff] [blame] | 597 | unsigned long i; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 598 | |
Joe Rouvier | 160f1fe | 2008-08-10 00:29:25 -0400 | [diff] [blame] | 599 | if (strict_strtoul(buf, 10, &i)) |
| 600 | return -EINVAL; |
| 601 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 602 | if (i) |
| 603 | ads7846_disable(ts); |
| 604 | else |
| 605 | ads7846_enable(ts); |
| 606 | |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 607 | return count; |
| 608 | } |
| 609 | |
| 610 | static DEVICE_ATTR(disable, 0664, ads7846_disable_show, ads7846_disable_store); |
| 611 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 612 | static struct attribute *ads784x_attributes[] = { |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 613 | &dev_attr_pen_down.attr, |
| 614 | &dev_attr_disable.attr, |
| 615 | NULL, |
| 616 | }; |
| 617 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 618 | static struct attribute_group ads784x_attr_group = { |
| 619 | .attrs = ads784x_attributes, |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 620 | }; |
| 621 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 622 | /*--------------------------------------------------------------------------*/ |
| 623 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 624 | static int get_pendown_state(struct ads7846 *ts) |
| 625 | { |
| 626 | if (ts->get_pendown_state) |
| 627 | return ts->get_pendown_state(); |
| 628 | |
| 629 | return !gpio_get_value(ts->gpio_pendown); |
| 630 | } |
| 631 | |
Eric Miao | fd746d5 | 2009-04-11 16:54:59 -0700 | [diff] [blame] | 632 | static void null_wait_for_sync(void) |
| 633 | { |
| 634 | } |
| 635 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 636 | static int ads7846_debounce_filter(void *ads, int data_idx, int *val) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 637 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 638 | struct ads7846 *ts = ads; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 639 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 640 | if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) { |
| 641 | /* Start over collecting consistent readings. */ |
| 642 | ts->read_rep = 0; |
| 643 | /* |
| 644 | * Repeat it, if this was the first read or the read |
| 645 | * wasn't consistent enough. |
| 646 | */ |
| 647 | if (ts->read_cnt < ts->debounce_max) { |
| 648 | ts->last_read = *val; |
| 649 | ts->read_cnt++; |
| 650 | return ADS7846_FILTER_REPEAT; |
| 651 | } else { |
| 652 | /* |
| 653 | * Maximum number of debouncing reached and still |
| 654 | * not enough number of consistent readings. Abort |
| 655 | * the whole sample, repeat it in the next sampling |
| 656 | * period. |
| 657 | */ |
| 658 | ts->read_cnt = 0; |
| 659 | return ADS7846_FILTER_IGNORE; |
| 660 | } |
| 661 | } else { |
| 662 | if (++ts->read_rep > ts->debounce_rep) { |
| 663 | /* |
| 664 | * Got a good reading for this coordinate, |
| 665 | * go for the next one. |
| 666 | */ |
| 667 | ts->read_cnt = 0; |
| 668 | ts->read_rep = 0; |
| 669 | return ADS7846_FILTER_OK; |
| 670 | } else { |
| 671 | /* Read more values that are consistent. */ |
| 672 | ts->read_cnt++; |
| 673 | return ADS7846_FILTER_REPEAT; |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | static int ads7846_no_filter(void *ads, int data_idx, int *val) |
| 679 | { |
| 680 | return ADS7846_FILTER_OK; |
| 681 | } |
| 682 | |
| 683 | static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m) |
| 684 | { |
| 685 | struct spi_transfer *t = |
| 686 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); |
| 687 | |
| 688 | if (ts->model == 7845) { |
| 689 | return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3; |
| 690 | } else { |
| 691 | /* |
| 692 | * adjust: on-wire is a must-ignore bit, a BE12 value, then |
| 693 | * padding; built from two 8 bit values written msb-first. |
| 694 | */ |
| 695 | return be16_to_cpup((__be16 *)t->rx_buf) >> 3; |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | static void ads7846_update_value(struct spi_message *m, int val) |
| 700 | { |
| 701 | struct spi_transfer *t = |
| 702 | list_entry(m->transfers.prev, struct spi_transfer, transfer_list); |
| 703 | |
| 704 | *(u16 *)t->rx_buf = val; |
| 705 | } |
| 706 | |
| 707 | static void ads7846_read_state(struct ads7846 *ts) |
| 708 | { |
| 709 | struct ads7846_packet *packet = ts->packet; |
| 710 | struct spi_message *m; |
| 711 | int msg_idx = 0; |
| 712 | int val; |
| 713 | int action; |
| 714 | int error; |
| 715 | |
| 716 | while (msg_idx < ts->msg_count) { |
| 717 | |
| 718 | ts->wait_for_sync(); |
| 719 | |
| 720 | m = &ts->msg[msg_idx]; |
| 721 | error = spi_sync(ts->spi, m); |
| 722 | if (error) { |
| 723 | dev_err(&ts->spi->dev, "spi_async --> %d\n", error); |
| 724 | packet->tc.ignore = true; |
| 725 | return; |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Last message is power down request, no need to convert |
| 730 | * or filter the value. |
| 731 | */ |
| 732 | if (msg_idx < ts->msg_count - 1) { |
| 733 | |
| 734 | val = ads7846_get_value(ts, m); |
| 735 | |
| 736 | action = ts->filter(ts->filter_data, msg_idx, &val); |
| 737 | switch (action) { |
| 738 | case ADS7846_FILTER_REPEAT: |
| 739 | continue; |
| 740 | |
| 741 | case ADS7846_FILTER_IGNORE: |
| 742 | packet->tc.ignore = true; |
| 743 | msg_idx = ts->msg_count - 1; |
| 744 | continue; |
| 745 | |
| 746 | case ADS7846_FILTER_OK: |
| 747 | ads7846_update_value(m, val); |
| 748 | packet->tc.ignore = false; |
| 749 | msg_idx++; |
| 750 | break; |
| 751 | |
| 752 | default: |
| 753 | BUG(); |
| 754 | } |
| 755 | } else { |
| 756 | msg_idx++; |
| 757 | } |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | static void ads7846_report_state(struct ads7846 *ts) |
| 762 | { |
| 763 | struct ads7846_packet *packet = ts->packet; |
| 764 | unsigned int Rt; |
| 765 | u16 x, y, z1, z2; |
| 766 | |
| 767 | /* |
| 768 | * ads7846_get_value() does in-place conversion (including byte swap) |
| 769 | * from on-the-wire format as part of debouncing to get stable |
| 770 | * readings. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 771 | */ |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 772 | if (ts->model == 7845) { |
| 773 | x = *(u16 *)packet->tc.x_buf; |
| 774 | y = *(u16 *)packet->tc.y_buf; |
| 775 | z1 = 0; |
| 776 | z2 = 0; |
| 777 | } else { |
| 778 | x = packet->tc.x; |
| 779 | y = packet->tc.y; |
| 780 | z1 = packet->tc.z1; |
| 781 | z2 = packet->tc.z2; |
| 782 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 783 | |
| 784 | /* range filtering */ |
| 785 | if (x == MAX_12BIT) |
| 786 | x = 0; |
| 787 | |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 788 | if (ts->model == 7843) { |
| 789 | Rt = ts->pressure_max / 2; |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 790 | } else if (ts->model == 7845) { |
| 791 | if (get_pendown_state(ts)) |
| 792 | Rt = ts->pressure_max / 2; |
| 793 | else |
| 794 | Rt = 0; |
| 795 | dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt); |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 796 | } else if (likely(x && z1)) { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 797 | /* compute touch pressure resistance using equation #2 */ |
| 798 | Rt = z2; |
| 799 | Rt -= z1; |
| 800 | Rt *= x; |
| 801 | Rt *= ts->x_plate_ohms; |
| 802 | Rt /= z1; |
| 803 | Rt = (Rt + 2047) >> 12; |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 804 | } else { |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 805 | Rt = 0; |
Hans-Christian Egtvedt | 9460b65 | 2008-07-23 14:38:27 -0400 | [diff] [blame] | 806 | } |
Nicolas Ferre | 969111e | 2007-02-28 23:51:03 -0500 | [diff] [blame] | 807 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 808 | /* |
| 809 | * Sample found inconsistent by debouncing or pressure is beyond |
Imre Deak | 1936d59 | 2007-01-18 00:45:31 -0500 | [diff] [blame] | 810 | * the maximum. Don't report it to user space, repeat at least |
| 811 | * once more the measurement |
| 812 | */ |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 813 | if (packet->tc.ignore || Rt > ts->pressure_max) { |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 814 | dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n", |
| 815 | packet->tc.ignore, Rt); |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 816 | return; |
| 817 | } |
| 818 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 819 | /* |
| 820 | * Maybe check the pendown state before reporting. This discards |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 821 | * false readings when the pen is lifted. |
| 822 | */ |
| 823 | if (ts->penirq_recheck_delay_usecs) { |
| 824 | udelay(ts->penirq_recheck_delay_usecs); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 825 | if (!get_pendown_state(ts)) |
Semih Hazar | 1d25891 | 2007-07-18 00:36:04 -0400 | [diff] [blame] | 826 | Rt = 0; |
| 827 | } |
| 828 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 829 | /* |
| 830 | * NOTE: We can't rely on the pressure to determine the pen down |
| 831 | * state, even this controller has a pressure sensor. The pressure |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 832 | * value can fluctuate for quite a while after lifting the pen and |
| 833 | * in some cases may not even settle at the expected value. |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 834 | * |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 835 | * The only safe way to check for the pen up condition is in the |
| 836 | * 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] | 837 | */ |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 838 | if (Rt) { |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 839 | struct input_dev *input = ts->input; |
Imre Deak | ae82d5a | 2006-04-26 00:12:14 -0400 | [diff] [blame] | 840 | |
Michael Roth | 86579a4 | 2009-05-18 16:04:44 -0700 | [diff] [blame] | 841 | if (ts->swap_xy) |
| 842 | swap(x, y); |
| 843 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 844 | if (!ts->pendown) { |
| 845 | input_report_key(input, BTN_TOUCH, 1); |
| 846 | ts->pendown = true; |
| 847 | dev_vdbg(&ts->spi->dev, "DOWN\n"); |
| 848 | } |
| 849 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 850 | input_report_abs(input, ABS_X, x); |
| 851 | input_report_abs(input, ABS_Y, y); |
Pavel Machek | 30ad7ba | 2009-11-23 08:17:38 -0800 | [diff] [blame] | 852 | input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 853 | |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 854 | input_sync(input); |
Pavel Machek | 52ce4eaa | 2009-11-23 08:25:17 -0800 | [diff] [blame] | 855 | dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt); |
Imre Deak | 15e3589 | 2007-01-18 00:45:43 -0500 | [diff] [blame] | 856 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 857 | } |
| 858 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 859 | static irqreturn_t ads7846_hard_irq(int irq, void *handle) |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 860 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 861 | struct ads7846 *ts = handle; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 862 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 863 | return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED; |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 864 | } |
| 865 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 866 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 867 | static irqreturn_t ads7846_irq(int irq, void *handle) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 868 | { |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 869 | struct ads7846 *ts = handle; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 870 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 871 | /* Start with a small delay before checking pendown state */ |
| 872 | msleep(TS_POLL_DELAY); |
| 873 | |
| 874 | while (!ts->stopped && get_pendown_state(ts)) { |
| 875 | |
| 876 | /* pen is down, continue with the measurement */ |
| 877 | ads7846_read_state(ts); |
| 878 | |
| 879 | if (!ts->stopped) |
| 880 | ads7846_report_state(ts); |
| 881 | |
| 882 | wait_event_timeout(ts->wait, ts->stopped, |
| 883 | msecs_to_jiffies(TS_POLL_PERIOD)); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 884 | } |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 885 | |
| 886 | if (ts->pendown) { |
| 887 | struct input_dev *input = ts->input; |
| 888 | |
| 889 | input_report_key(input, BTN_TOUCH, 0); |
| 890 | input_report_abs(input, ABS_PRESSURE, 0); |
| 891 | input_sync(input); |
| 892 | |
| 893 | ts->pendown = false; |
| 894 | dev_vdbg(&ts->spi->dev, "UP\n"); |
| 895 | } |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 896 | |
| 897 | return IRQ_HANDLED; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 898 | } |
| 899 | |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 900 | #ifdef CONFIG_PM_SLEEP |
| 901 | static int ads7846_suspend(struct device *dev) |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 902 | { |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 903 | struct ads7846 *ts = dev_get_drvdata(dev); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 904 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 905 | mutex_lock(&ts->lock); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 906 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 907 | if (!ts->suspended) { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 908 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 909 | if (!ts->disabled) |
| 910 | __ads7846_disable(ts); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 911 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 912 | if (device_may_wakeup(&ts->spi->dev)) |
| 913 | enable_irq_wake(ts->spi->irq); |
| 914 | |
| 915 | ts->suspended = true; |
| 916 | } |
| 917 | |
| 918 | mutex_unlock(&ts->lock); |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 919 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 920 | return 0; |
| 921 | } |
| 922 | |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 923 | static int ads7846_resume(struct device *dev) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 924 | { |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 925 | struct ads7846 *ts = dev_get_drvdata(dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 926 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 927 | mutex_lock(&ts->lock); |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 928 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 929 | if (ts->suspended) { |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 930 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 931 | ts->suspended = false; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 932 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 933 | if (device_may_wakeup(&ts->spi->dev)) |
| 934 | disable_irq_wake(ts->spi->irq); |
| 935 | |
| 936 | if (!ts->disabled) |
| 937 | __ads7846_enable(ts); |
| 938 | } |
| 939 | |
| 940 | mutex_unlock(&ts->lock); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 941 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 942 | return 0; |
| 943 | } |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 944 | #endif |
| 945 | |
| 946 | static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 947 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 948 | static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads7846 *ts) |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 949 | { |
| 950 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
| 951 | int err; |
| 952 | |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 953 | /* |
| 954 | * REVISIT when the irq can be triggered active-low, or if for some |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 955 | * reason the touchscreen isn't hooked up, we don't need to access |
| 956 | * the pendown state. |
| 957 | */ |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 958 | |
| 959 | if (pdata->get_pendown_state) { |
| 960 | ts->get_pendown_state = pdata->get_pendown_state; |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 961 | } else if (gpio_is_valid(pdata->gpio_pendown)) { |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 962 | |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 963 | err = gpio_request(pdata->gpio_pendown, "ads7846_pendown"); |
| 964 | if (err) { |
| 965 | dev_err(&spi->dev, "failed to request pendown GPIO%d\n", |
| 966 | pdata->gpio_pendown); |
| 967 | return err; |
| 968 | } |
Igor Grinberg | 1201e7e | 2011-05-11 15:45:05 -0700 | [diff] [blame^] | 969 | err = gpio_direction_input(pdata->gpio_pendown); |
| 970 | if (err) { |
| 971 | dev_err(&spi->dev, "failed to setup pendown GPIO%d\n", |
| 972 | pdata->gpio_pendown); |
| 973 | gpio_free(pdata->gpio_pendown); |
| 974 | return err; |
| 975 | } |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 976 | |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 977 | ts->gpio_pendown = pdata->gpio_pendown; |
| 978 | |
| 979 | } else { |
| 980 | dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n"); |
| 981 | return -EINVAL; |
| 982 | } |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 983 | |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 984 | return 0; |
| 985 | } |
| 986 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 987 | /* |
| 988 | * Set up the transfers to read touchscreen state; this assumes we |
| 989 | * use formula #2 for pressure, not #3. |
| 990 | */ |
| 991 | static void __devinit ads7846_setup_spi_msg(struct ads7846 *ts, |
| 992 | const struct ads7846_platform_data *pdata) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 993 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 994 | struct spi_message *m = &ts->msg[0]; |
| 995 | struct spi_transfer *x = ts->xfer; |
| 996 | struct ads7846_packet *packet = ts->packet; |
| 997 | int vref = pdata->keep_vref_on; |
Imre Deak | de2defd | 2007-01-18 00:45:21 -0500 | [diff] [blame] | 998 | |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 999 | if (ts->model == 7873) { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1000 | /* |
| 1001 | * The AD7873 is almost identical to the ADS7846 |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 1002 | * keep VREF off during differential/ratiometric |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1003 | * conversion modes. |
Michael Hennerich | 06a0912 | 2010-03-09 20:38:45 -0800 | [diff] [blame] | 1004 | */ |
| 1005 | ts->model = 7846; |
| 1006 | vref = 0; |
| 1007 | } |
| 1008 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1009 | ts->msg_count = 1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1010 | spi_message_init(m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1011 | m->context = ts; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1012 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1013 | if (ts->model == 7845) { |
| 1014 | packet->read_y_cmd[0] = READ_Y(vref); |
| 1015 | packet->read_y_cmd[1] = 0; |
| 1016 | packet->read_y_cmd[2] = 0; |
| 1017 | x->tx_buf = &packet->read_y_cmd[0]; |
| 1018 | x->rx_buf = &packet->tc.y_buf[0]; |
| 1019 | x->len = 3; |
| 1020 | spi_message_add_tail(x, m); |
| 1021 | } else { |
| 1022 | /* y- still on; turn on only y+ (and ADC) */ |
| 1023 | packet->read_y = READ_Y(vref); |
| 1024 | x->tx_buf = &packet->read_y; |
| 1025 | x->len = 1; |
| 1026 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1027 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1028 | x++; |
| 1029 | x->rx_buf = &packet->tc.y; |
| 1030 | x->len = 2; |
| 1031 | spi_message_add_tail(x, m); |
| 1032 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1033 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1034 | /* |
| 1035 | * The first sample after switching drivers can be low quality; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1036 | * optionally discard it, using a second one after the signals |
| 1037 | * have had enough time to stabilize. |
| 1038 | */ |
| 1039 | if (pdata->settle_delay_usecs) { |
| 1040 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1041 | |
| 1042 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1043 | x->tx_buf = &packet->read_y; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1044 | x->len = 1; |
| 1045 | spi_message_add_tail(x, m); |
| 1046 | |
| 1047 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1048 | x->rx_buf = &packet->tc.y; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1049 | x->len = 2; |
| 1050 | spi_message_add_tail(x, m); |
| 1051 | } |
| 1052 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1053 | ts->msg_count++; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1054 | m++; |
| 1055 | spi_message_init(m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1056 | m->context = ts; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1057 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1058 | if (ts->model == 7845) { |
| 1059 | x++; |
| 1060 | packet->read_x_cmd[0] = READ_X(vref); |
| 1061 | packet->read_x_cmd[1] = 0; |
| 1062 | packet->read_x_cmd[2] = 0; |
| 1063 | x->tx_buf = &packet->read_x_cmd[0]; |
| 1064 | x->rx_buf = &packet->tc.x_buf[0]; |
| 1065 | x->len = 3; |
| 1066 | spi_message_add_tail(x, m); |
| 1067 | } else { |
| 1068 | /* turn y- off, x+ on, then leave in lowpower */ |
| 1069 | x++; |
| 1070 | packet->read_x = READ_X(vref); |
| 1071 | x->tx_buf = &packet->read_x; |
| 1072 | x->len = 1; |
| 1073 | spi_message_add_tail(x, m); |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1074 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1075 | x++; |
| 1076 | x->rx_buf = &packet->tc.x; |
| 1077 | x->len = 2; |
| 1078 | spi_message_add_tail(x, m); |
| 1079 | } |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1080 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1081 | /* ... maybe discard first sample ... */ |
| 1082 | if (pdata->settle_delay_usecs) { |
| 1083 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1084 | |
| 1085 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1086 | x->tx_buf = &packet->read_x; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1087 | x->len = 1; |
| 1088 | spi_message_add_tail(x, m); |
| 1089 | |
| 1090 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1091 | x->rx_buf = &packet->tc.x; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1092 | x->len = 2; |
| 1093 | spi_message_add_tail(x, m); |
| 1094 | } |
| 1095 | |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1096 | /* turn y+ off, x- on; we'll use formula #2 */ |
| 1097 | if (ts->model == 7846) { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1098 | ts->msg_count++; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1099 | m++; |
| 1100 | spi_message_init(m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1101 | m->context = ts; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1102 | |
| 1103 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1104 | packet->read_z1 = READ_Z1(vref); |
| 1105 | x->tx_buf = &packet->read_z1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1106 | x->len = 1; |
| 1107 | spi_message_add_tail(x, m); |
| 1108 | |
| 1109 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1110 | x->rx_buf = &packet->tc.z1; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1111 | x->len = 2; |
| 1112 | spi_message_add_tail(x, m); |
| 1113 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1114 | /* ... maybe discard first sample ... */ |
| 1115 | if (pdata->settle_delay_usecs) { |
| 1116 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1117 | |
| 1118 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1119 | x->tx_buf = &packet->read_z1; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1120 | x->len = 1; |
| 1121 | spi_message_add_tail(x, m); |
| 1122 | |
| 1123 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1124 | x->rx_buf = &packet->tc.z1; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1125 | x->len = 2; |
| 1126 | spi_message_add_tail(x, m); |
| 1127 | } |
| 1128 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1129 | ts->msg_count++; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1130 | m++; |
| 1131 | spi_message_init(m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1132 | m->context = ts; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1133 | |
| 1134 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1135 | packet->read_z2 = READ_Z2(vref); |
| 1136 | x->tx_buf = &packet->read_z2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1137 | x->len = 1; |
| 1138 | spi_message_add_tail(x, m); |
| 1139 | |
| 1140 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1141 | x->rx_buf = &packet->tc.z2; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1142 | x->len = 2; |
| 1143 | spi_message_add_tail(x, m); |
| 1144 | |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1145 | /* ... maybe discard first sample ... */ |
| 1146 | if (pdata->settle_delay_usecs) { |
| 1147 | x->delay_usecs = pdata->settle_delay_usecs; |
| 1148 | |
| 1149 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1150 | x->tx_buf = &packet->read_z2; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1151 | x->len = 1; |
| 1152 | spi_message_add_tail(x, m); |
| 1153 | |
| 1154 | x++; |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1155 | x->rx_buf = &packet->tc.z2; |
Semih Hazar | e4f4886 | 2007-07-18 00:35:56 -0400 | [diff] [blame] | 1156 | x->len = 2; |
| 1157 | spi_message_add_tail(x, m); |
| 1158 | } |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1159 | } |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1160 | |
| 1161 | /* power down */ |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1162 | ts->msg_count++; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1163 | m++; |
| 1164 | spi_message_init(m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1165 | m->context = ts; |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1166 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1167 | if (ts->model == 7845) { |
| 1168 | x++; |
| 1169 | packet->pwrdown_cmd[0] = PWRDOWN; |
| 1170 | packet->pwrdown_cmd[1] = 0; |
| 1171 | packet->pwrdown_cmd[2] = 0; |
| 1172 | x->tx_buf = &packet->pwrdown_cmd[0]; |
| 1173 | x->len = 3; |
| 1174 | } else { |
| 1175 | x++; |
| 1176 | packet->pwrdown = PWRDOWN; |
| 1177 | x->tx_buf = &packet->pwrdown; |
| 1178 | x->len = 1; |
| 1179 | spi_message_add_tail(x, m); |
Imre Deak | 53a0ef89 | 2006-04-11 23:41:49 -0400 | [diff] [blame] | 1180 | |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1181 | x++; |
| 1182 | x->rx_buf = &packet->dummy; |
| 1183 | x->len = 2; |
| 1184 | } |
| 1185 | |
David Brownell | d93f70b | 2006-02-15 00:49:35 -0500 | [diff] [blame] | 1186 | CS_CHANGE(*x); |
Imre Deak | 0b7018a | 2006-04-11 23:42:03 -0400 | [diff] [blame] | 1187 | spi_message_add_tail(x, m); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1188 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1189 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1190 | static int __devinit ads7846_probe(struct spi_device *spi) |
| 1191 | { |
| 1192 | struct ads7846 *ts; |
| 1193 | struct ads7846_packet *packet; |
| 1194 | struct input_dev *input_dev; |
| 1195 | struct ads7846_platform_data *pdata = spi->dev.platform_data; |
| 1196 | unsigned long irq_flags; |
| 1197 | int err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1198 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1199 | if (!spi->irq) { |
| 1200 | dev_dbg(&spi->dev, "no IRQ?\n"); |
| 1201 | return -ENODEV; |
| 1202 | } |
| 1203 | |
| 1204 | if (!pdata) { |
| 1205 | dev_dbg(&spi->dev, "no platform data?\n"); |
| 1206 | return -ENODEV; |
| 1207 | } |
| 1208 | |
| 1209 | /* don't exceed max specified sample rate */ |
| 1210 | if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) { |
| 1211 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", |
| 1212 | (spi->max_speed_hz/SAMPLE_BITS)/1000); |
| 1213 | return -EINVAL; |
| 1214 | } |
| 1215 | |
| 1216 | /* We'd set TX word size 8 bits and RX word size to 13 bits ... except |
| 1217 | * that even if the hardware can do that, the SPI controller driver |
| 1218 | * may not. So we stick to very-portable 8 bit words, both RX and TX. |
| 1219 | */ |
| 1220 | spi->bits_per_word = 8; |
| 1221 | spi->mode = SPI_MODE_0; |
| 1222 | err = spi_setup(spi); |
| 1223 | if (err < 0) |
| 1224 | return err; |
| 1225 | |
| 1226 | ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL); |
| 1227 | packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL); |
| 1228 | input_dev = input_allocate_device(); |
| 1229 | if (!ts || !packet || !input_dev) { |
| 1230 | err = -ENOMEM; |
| 1231 | goto err_free_mem; |
| 1232 | } |
| 1233 | |
| 1234 | dev_set_drvdata(&spi->dev, ts); |
| 1235 | |
| 1236 | ts->packet = packet; |
| 1237 | ts->spi = spi; |
| 1238 | ts->input = input_dev; |
| 1239 | ts->vref_mv = pdata->vref_mv; |
| 1240 | ts->swap_xy = pdata->swap_xy; |
| 1241 | |
| 1242 | mutex_init(&ts->lock); |
| 1243 | init_waitqueue_head(&ts->wait); |
| 1244 | |
| 1245 | ts->model = pdata->model ? : 7846; |
| 1246 | ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; |
| 1247 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; |
| 1248 | ts->pressure_max = pdata->pressure_max ? : ~0; |
| 1249 | |
| 1250 | if (pdata->filter != NULL) { |
| 1251 | if (pdata->filter_init != NULL) { |
| 1252 | err = pdata->filter_init(pdata, &ts->filter_data); |
| 1253 | if (err < 0) |
| 1254 | goto err_free_mem; |
| 1255 | } |
| 1256 | ts->filter = pdata->filter; |
| 1257 | ts->filter_cleanup = pdata->filter_cleanup; |
| 1258 | } else if (pdata->debounce_max) { |
| 1259 | ts->debounce_max = pdata->debounce_max; |
| 1260 | if (ts->debounce_max < 2) |
| 1261 | ts->debounce_max = 2; |
| 1262 | ts->debounce_tol = pdata->debounce_tol; |
| 1263 | ts->debounce_rep = pdata->debounce_rep; |
| 1264 | ts->filter = ads7846_debounce_filter; |
| 1265 | ts->filter_data = ts; |
| 1266 | } else { |
| 1267 | ts->filter = ads7846_no_filter; |
| 1268 | } |
| 1269 | |
| 1270 | err = ads7846_setup_pendown(spi, ts); |
| 1271 | if (err) |
| 1272 | goto err_cleanup_filter; |
| 1273 | |
| 1274 | if (pdata->penirq_recheck_delay_usecs) |
| 1275 | ts->penirq_recheck_delay_usecs = |
| 1276 | pdata->penirq_recheck_delay_usecs; |
| 1277 | |
| 1278 | ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; |
| 1279 | |
| 1280 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); |
| 1281 | snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); |
| 1282 | |
| 1283 | input_dev->name = ts->name; |
| 1284 | input_dev->phys = ts->phys; |
| 1285 | input_dev->dev.parent = &spi->dev; |
| 1286 | |
| 1287 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 1288 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 1289 | input_set_abs_params(input_dev, ABS_X, |
| 1290 | pdata->x_min ? : 0, |
| 1291 | pdata->x_max ? : MAX_12BIT, |
| 1292 | 0, 0); |
| 1293 | input_set_abs_params(input_dev, ABS_Y, |
| 1294 | pdata->y_min ? : 0, |
| 1295 | pdata->y_max ? : MAX_12BIT, |
| 1296 | 0, 0); |
| 1297 | input_set_abs_params(input_dev, ABS_PRESSURE, |
| 1298 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
| 1299 | |
| 1300 | ads7846_setup_spi_msg(ts, pdata); |
Imre Deak | d5b415c | 2006-04-26 00:13:18 -0400 | [diff] [blame] | 1301 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1302 | ts->reg = regulator_get(&spi->dev, "vcc"); |
| 1303 | if (IS_ERR(ts->reg)) { |
Kevin Hilman | 067fb2f | 2010-05-26 23:30:55 -0700 | [diff] [blame] | 1304 | err = PTR_ERR(ts->reg); |
Dmitry Torokhov | 56960b3 | 2010-06-02 00:40:06 -0700 | [diff] [blame] | 1305 | dev_err(&spi->dev, "unable to get regulator: %d\n", err); |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1306 | goto err_free_gpio; |
| 1307 | } |
| 1308 | |
| 1309 | err = regulator_enable(ts->reg); |
| 1310 | if (err) { |
| 1311 | dev_err(&spi->dev, "unable to enable regulator: %d\n", err); |
| 1312 | goto err_put_regulator; |
| 1313 | } |
| 1314 | |
Dmitry Torokhov | 0f622bf | 2010-07-01 09:01:50 -0700 | [diff] [blame] | 1315 | irq_flags = pdata->irq_flags ? : IRQF_TRIGGER_FALLING; |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1316 | irq_flags |= IRQF_ONESHOT; |
Anatolij Gustschin | 7804302 | 2010-06-28 01:25:19 -0700 | [diff] [blame] | 1317 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1318 | err = request_threaded_irq(spi->irq, ads7846_hard_irq, ads7846_irq, |
| 1319 | irq_flags, spi->dev.driver->name, ts); |
Dmitry Torokhov | 0f622bf | 2010-07-01 09:01:50 -0700 | [diff] [blame] | 1320 | if (err && !pdata->irq_flags) { |
Michael Roth | c57c0a2 | 2009-06-10 23:30:55 -0700 | [diff] [blame] | 1321 | dev_info(&spi->dev, |
| 1322 | "trying pin change workaround on irq %d\n", spi->irq); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1323 | irq_flags |= IRQF_TRIGGER_RISING; |
| 1324 | err = request_threaded_irq(spi->irq, |
| 1325 | ads7846_hard_irq, ads7846_irq, |
| 1326 | irq_flags, spi->dev.driver->name, ts); |
Dmitry Torokhov | 0f622bf | 2010-07-01 09:01:50 -0700 | [diff] [blame] | 1327 | } |
| 1328 | |
| 1329 | if (err) { |
| 1330 | dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); |
| 1331 | goto err_disable_regulator; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1332 | } |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1333 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1334 | err = ads784x_hwmon_register(spi, ts); |
| 1335 | if (err) |
| 1336 | goto err_free_irq; |
| 1337 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1338 | dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1339 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1340 | /* |
| 1341 | * Take a first sample, leaving nPENIRQ active and vREF off; avoid |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1342 | * the touchscreen, in case it's not connected. |
| 1343 | */ |
Anatolij Gustschin | 3eac5c7 | 2010-07-01 09:01:56 -0700 | [diff] [blame] | 1344 | if (ts->model == 7845) |
| 1345 | ads7845_read12_ser(&spi->dev, PWRDOWN); |
| 1346 | else |
Alexander Stein | ebcaaad | 2011-05-11 16:24:08 -0700 | [diff] [blame] | 1347 | (void) ads7846_read12_ser(&spi->dev, READ_12BIT_SER(vaux)); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1348 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1349 | err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group); |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1350 | if (err) |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1351 | goto err_remove_hwmon; |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1352 | |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1353 | err = input_register_device(input_dev); |
| 1354 | if (err) |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1355 | goto err_remove_attr_group; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1356 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 1357 | device_init_wakeup(&spi->dev, pdata->wakeup); |
| 1358 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1359 | return 0; |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1360 | |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1361 | err_remove_attr_group: |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1362 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
| 1363 | err_remove_hwmon: |
| 1364 | ads784x_hwmon_unregister(spi, ts); |
Dmitry Torokhov | 8dd5165 | 2006-11-02 23:34:09 -0500 | [diff] [blame] | 1365 | err_free_irq: |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1366 | free_irq(spi->irq, ts); |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1367 | err_disable_regulator: |
| 1368 | regulator_disable(ts->reg); |
| 1369 | err_put_regulator: |
| 1370 | regulator_put(ts->reg); |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1371 | err_free_gpio: |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 1372 | if (!ts->get_pendown_state) |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1373 | gpio_free(ts->gpio_pendown); |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1374 | err_cleanup_filter: |
| 1375 | if (ts->filter_cleanup) |
| 1376 | ts->filter_cleanup(ts->filter_data); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1377 | err_free_mem: |
| 1378 | input_free_device(input_dev); |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1379 | kfree(packet); |
Dmitry Torokhov | a90f7e9 | 2006-02-15 00:49:22 -0500 | [diff] [blame] | 1380 | kfree(ts); |
| 1381 | return err; |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1382 | } |
| 1383 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1384 | static int __devexit ads7846_remove(struct spi_device *spi) |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1385 | { |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1386 | struct ads7846 *ts = dev_get_drvdata(&spi->dev); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1387 | |
Ranjith Lohithakshan | fdba2bb | 2010-03-10 23:41:22 -0800 | [diff] [blame] | 1388 | device_init_wakeup(&spi->dev, false); |
| 1389 | |
David Brownell | 2c8dc07 | 2007-01-18 00:45:48 -0500 | [diff] [blame] | 1390 | sysfs_remove_group(&spi->dev.kobj, &ads784x_attr_group); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1391 | |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1392 | ads7846_disable(ts); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1393 | free_irq(ts->spi->irq, ts); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1394 | |
| 1395 | input_unregister_device(ts->input); |
| 1396 | |
| 1397 | ads784x_hwmon_unregister(spi, ts); |
Imre Deak | 7de90a8 | 2006-04-11 23:43:55 -0400 | [diff] [blame] | 1398 | |
Grazvydas Ignotas | 9114337 | 2010-02-25 02:04:56 -0800 | [diff] [blame] | 1399 | regulator_disable(ts->reg); |
| 1400 | regulator_put(ts->reg); |
| 1401 | |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 1402 | if (!ts->get_pendown_state) { |
| 1403 | /* |
| 1404 | * If we are not using specialized pendown method we must |
| 1405 | * have been relying on gpio we set up ourselves. |
| 1406 | */ |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1407 | gpio_free(ts->gpio_pendown); |
Dmitry Torokhov | 0fbc9fd | 2011-02-04 00:37:26 -0800 | [diff] [blame] | 1408 | } |
Eric Miao | 4d5975e | 2008-09-10 12:06:15 -0400 | [diff] [blame] | 1409 | |
Imre Deak | da970e6 | 2007-01-18 00:44:41 -0500 | [diff] [blame] | 1410 | if (ts->filter_cleanup) |
| 1411 | ts->filter_cleanup(ts->filter_data); |
| 1412 | |
Dmitry Torokhov | e8f462d | 2008-10-09 00:52:23 -0400 | [diff] [blame] | 1413 | kfree(ts->packet); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1414 | kfree(ts); |
| 1415 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1416 | dev_dbg(&spi->dev, "unregistered touchscreen\n"); |
Jason Wang | 2991a1c | 2010-10-13 11:35:40 -0700 | [diff] [blame] | 1417 | |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1418 | return 0; |
| 1419 | } |
| 1420 | |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1421 | static struct spi_driver ads7846_driver = { |
| 1422 | .driver = { |
| 1423 | .name = "ads7846", |
| 1424 | .bus = &spi_bus_type, |
| 1425 | .owner = THIS_MODULE, |
Mark Brown | 3c36e71 | 2011-01-20 22:51:26 -0800 | [diff] [blame] | 1426 | .pm = &ads7846_pm, |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1427 | }, |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1428 | .probe = ads7846_probe, |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1429 | .remove = __devexit_p(ads7846_remove), |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1430 | }; |
| 1431 | |
| 1432 | static int __init ads7846_init(void) |
| 1433 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1434 | return spi_register_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1435 | } |
| 1436 | module_init(ads7846_init); |
| 1437 | |
| 1438 | static void __exit ads7846_exit(void) |
| 1439 | { |
David Brownell | 2e5a7bd | 2006-01-08 13:34:25 -0800 | [diff] [blame] | 1440 | spi_unregister_driver(&ads7846_driver); |
David Brownell | ffa458c | 2006-01-08 13:34:21 -0800 | [diff] [blame] | 1441 | } |
| 1442 | module_exit(ads7846_exit); |
| 1443 | |
| 1444 | MODULE_DESCRIPTION("ADS7846 TouchScreen Driver"); |
| 1445 | MODULE_LICENSE("GPL"); |
Anton Vorontsov | e0626e3 | 2009-09-22 16:46:08 -0700 | [diff] [blame] | 1446 | MODULE_ALIAS("spi:ads7846"); |