Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 1 | /* |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 2 | * AD7879/AD7889 based touchscreen and GPIO driver |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 3 | * |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 4 | * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 5 | * |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 6 | * Licensed under the GPL-2 or later. |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 7 | * |
| 8 | * History: |
| 9 | * Copyright (c) 2005 David Brownell |
| 10 | * Copyright (c) 2006 Nokia Corporation |
| 11 | * Various changes: Imre Deak <imre.deak@nokia.com> |
| 12 | * |
| 13 | * Using code from: |
| 14 | * - corgi_ts.c |
| 15 | * Copyright (C) 2004-2005 Richard Purdie |
| 16 | * - omap_ts.[hc], ads7846.h, ts_osk.c |
| 17 | * Copyright (C) 2002 MontaVista Software |
| 18 | * Copyright (C) 2004 Texas Instruments |
| 19 | * Copyright (C) 2005 Dirk Behme |
| 20 | * - ad7877.c |
| 21 | * Copyright (C) 2006-2008 Analog Devices Inc. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/input.h> |
| 28 | #include <linux/interrupt.h> |
| 29 | #include <linux/irq.h> |
| 30 | #include <linux/slab.h> |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 31 | #include <linux/spi/spi.h> |
| 32 | #include <linux/i2c.h> |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 33 | #include <linux/gpio.h> |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 34 | |
| 35 | #include <linux/spi/ad7879.h> |
Paul Gortmaker | d2d8442 | 2011-07-03 13:53:48 -0400 | [diff] [blame] | 36 | #include <linux/module.h> |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 37 | #include "ad7879.h" |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 38 | |
| 39 | #define AD7879_REG_ZEROS 0 |
| 40 | #define AD7879_REG_CTRL1 1 |
| 41 | #define AD7879_REG_CTRL2 2 |
| 42 | #define AD7879_REG_CTRL3 3 |
| 43 | #define AD7879_REG_AUX1HIGH 4 |
| 44 | #define AD7879_REG_AUX1LOW 5 |
| 45 | #define AD7879_REG_TEMP1HIGH 6 |
| 46 | #define AD7879_REG_TEMP1LOW 7 |
| 47 | #define AD7879_REG_XPLUS 8 |
| 48 | #define AD7879_REG_YPLUS 9 |
| 49 | #define AD7879_REG_Z1 10 |
| 50 | #define AD7879_REG_Z2 11 |
| 51 | #define AD7879_REG_AUXVBAT 12 |
| 52 | #define AD7879_REG_TEMP 13 |
| 53 | #define AD7879_REG_REVID 14 |
| 54 | |
| 55 | /* Control REG 1 */ |
| 56 | #define AD7879_TMR(x) ((x & 0xFF) << 0) |
| 57 | #define AD7879_ACQ(x) ((x & 0x3) << 8) |
| 58 | #define AD7879_MODE_NOC (0 << 10) /* Do not convert */ |
| 59 | #define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */ |
| 60 | #define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */ |
| 61 | #define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */ |
| 62 | #define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */ |
| 63 | |
| 64 | /* Control REG 2 */ |
| 65 | #define AD7879_FCD(x) ((x & 0x3) << 0) |
| 66 | #define AD7879_RESET (1 << 4) |
| 67 | #define AD7879_MFS(x) ((x & 0x3) << 5) |
| 68 | #define AD7879_AVG(x) ((x & 0x3) << 7) |
| 69 | #define AD7879_SER (1 << 9) /* non-differential */ |
| 70 | #define AD7879_DFR (0 << 9) /* differential */ |
| 71 | #define AD7879_GPIOPOL (1 << 10) |
| 72 | #define AD7879_GPIODIR (1 << 11) |
| 73 | #define AD7879_GPIO_DATA (1 << 12) |
| 74 | #define AD7879_GPIO_EN (1 << 13) |
| 75 | #define AD7879_PM(x) ((x & 0x3) << 14) |
| 76 | #define AD7879_PM_SHUTDOWN (0) |
| 77 | #define AD7879_PM_DYN (1) |
| 78 | #define AD7879_PM_FULLON (2) |
| 79 | |
| 80 | /* Control REG 3 */ |
| 81 | #define AD7879_TEMPMASK_BIT (1<<15) |
| 82 | #define AD7879_AUXVBATMASK_BIT (1<<14) |
| 83 | #define AD7879_INTMODE_BIT (1<<13) |
| 84 | #define AD7879_GPIOALERTMASK_BIT (1<<12) |
| 85 | #define AD7879_AUXLOW_BIT (1<<11) |
| 86 | #define AD7879_AUXHIGH_BIT (1<<10) |
| 87 | #define AD7879_TEMPLOW_BIT (1<<9) |
| 88 | #define AD7879_TEMPHIGH_BIT (1<<8) |
| 89 | #define AD7879_YPLUS_BIT (1<<7) |
| 90 | #define AD7879_XPLUS_BIT (1<<6) |
| 91 | #define AD7879_Z1_BIT (1<<5) |
| 92 | #define AD7879_Z2_BIT (1<<4) |
| 93 | #define AD7879_AUX_BIT (1<<3) |
| 94 | #define AD7879_VBAT_BIT (1<<2) |
| 95 | #define AD7879_TEMP_BIT (1<<1) |
| 96 | |
| 97 | enum { |
| 98 | AD7879_SEQ_XPOS = 0, |
| 99 | AD7879_SEQ_YPOS = 1, |
| 100 | AD7879_SEQ_Z1 = 2, |
| 101 | AD7879_SEQ_Z2 = 3, |
| 102 | AD7879_NR_SENSE = 4, |
| 103 | }; |
| 104 | |
| 105 | #define MAX_12BIT ((1<<12)-1) |
| 106 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50) |
| 107 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 108 | struct ad7879 { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 109 | const struct ad7879_bus_ops *bops; |
| 110 | |
| 111 | struct device *dev; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 112 | struct input_dev *input; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 113 | struct timer_list timer; |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 114 | #ifdef CONFIG_GPIOLIB |
| 115 | struct gpio_chip gc; |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 116 | struct mutex mutex; |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 117 | #endif |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 118 | unsigned int irq; |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 119 | bool disabled; /* P: input->mutex */ |
| 120 | bool suspended; /* P: input->mutex */ |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 121 | u16 conversion_data[AD7879_NR_SENSE]; |
| 122 | char phys[32]; |
| 123 | u8 first_conversion_delay; |
| 124 | u8 acquisition_time; |
| 125 | u8 averaging; |
| 126 | u8 pen_down_acc_interval; |
| 127 | u8 median; |
| 128 | u16 x_plate_ohms; |
| 129 | u16 pressure_max; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 130 | u16 cmd_crtl1; |
| 131 | u16 cmd_crtl2; |
| 132 | u16 cmd_crtl3; |
Michael Hennerich | b584efc | 2010-10-28 14:59:05 -0700 | [diff] [blame] | 133 | int x; |
| 134 | int y; |
| 135 | int Rt; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 136 | }; |
| 137 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 138 | static int ad7879_read(struct ad7879 *ts, u8 reg) |
| 139 | { |
| 140 | return ts->bops->read(ts->dev, reg); |
| 141 | } |
| 142 | |
| 143 | static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf) |
| 144 | { |
| 145 | return ts->bops->multi_read(ts->dev, first_reg, count, buf); |
| 146 | } |
| 147 | |
| 148 | static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val) |
| 149 | { |
| 150 | return ts->bops->write(ts->dev, reg, val); |
| 151 | } |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 152 | |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 153 | static int ad7879_report(struct ad7879 *ts) |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 154 | { |
| 155 | struct input_dev *input_dev = ts->input; |
| 156 | unsigned Rt; |
| 157 | u16 x, y, z1, z2; |
| 158 | |
| 159 | x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT; |
| 160 | y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT; |
| 161 | z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; |
| 162 | z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; |
| 163 | |
| 164 | /* |
| 165 | * The samples processed here are already preprocessed by the AD7879. |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 166 | * The preprocessing function consists of a median and an averaging |
| 167 | * filter. The combination of these two techniques provides a robust |
| 168 | * solution, discarding the spurious noise in the signal and keeping |
| 169 | * only the data of interest. The size of both filters is |
| 170 | * programmable. (dev.platform_data, see linux/spi/ad7879.h) Other |
| 171 | * user-programmable conversion controls include variable acquisition |
| 172 | * time, and first conversion delay. Up to 16 averages can be taken |
| 173 | * per conversion. |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 174 | */ |
| 175 | |
| 176 | if (likely(x && z1)) { |
| 177 | /* compute touch pressure resistance using equation #1 */ |
| 178 | Rt = (z2 - z1) * x * ts->x_plate_ohms; |
| 179 | Rt /= z1; |
| 180 | Rt = (Rt + 2047) >> 12; |
| 181 | |
Michael Hennerich | b584efc | 2010-10-28 14:59:05 -0700 | [diff] [blame] | 182 | /* |
| 183 | * Sample found inconsistent, pressure is beyond |
| 184 | * the maximum. Don't report it to user space. |
| 185 | */ |
| 186 | if (Rt > ts->pressure_max) |
| 187 | return -EINVAL; |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 188 | |
Michael Hennerich | b584efc | 2010-10-28 14:59:05 -0700 | [diff] [blame] | 189 | /* |
| 190 | * Note that we delay reporting events by one sample. |
| 191 | * This is done to avoid reporting last sample of the |
| 192 | * touch sequence, which may be incomplete if finger |
| 193 | * leaves the surface before last reading is taken. |
| 194 | */ |
| 195 | if (timer_pending(&ts->timer)) { |
| 196 | /* Touch continues */ |
| 197 | input_report_key(input_dev, BTN_TOUCH, 1); |
| 198 | input_report_abs(input_dev, ABS_X, ts->x); |
| 199 | input_report_abs(input_dev, ABS_Y, ts->y); |
| 200 | input_report_abs(input_dev, ABS_PRESSURE, ts->Rt); |
| 201 | input_sync(input_dev); |
| 202 | } |
| 203 | |
| 204 | ts->x = x; |
| 205 | ts->y = y; |
| 206 | ts->Rt = Rt; |
| 207 | |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 208 | return 0; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 209 | } |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 210 | |
| 211 | return -EINVAL; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 214 | static void ad7879_ts_event_release(struct ad7879 *ts) |
| 215 | { |
| 216 | struct input_dev *input_dev = ts->input; |
| 217 | |
| 218 | input_report_abs(input_dev, ABS_PRESSURE, 0); |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 219 | input_report_key(input_dev, BTN_TOUCH, 0); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 220 | input_sync(input_dev); |
| 221 | } |
| 222 | |
| 223 | static void ad7879_timer(unsigned long handle) |
| 224 | { |
| 225 | struct ad7879 *ts = (void *)handle; |
| 226 | |
| 227 | ad7879_ts_event_release(ts); |
| 228 | } |
| 229 | |
| 230 | static irqreturn_t ad7879_irq(int irq, void *handle) |
| 231 | { |
| 232 | struct ad7879 *ts = handle; |
| 233 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 234 | ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 235 | |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 236 | if (!ad7879_report(ts)) |
| 237 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 238 | |
| 239 | return IRQ_HANDLED; |
| 240 | } |
| 241 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 242 | static void __ad7879_enable(struct ad7879 *ts) |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 243 | { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 244 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
| 245 | ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3); |
| 246 | ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1); |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 247 | |
| 248 | enable_irq(ts->irq); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 249 | } |
| 250 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 251 | static void __ad7879_disable(struct ad7879 *ts) |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 252 | { |
Michael Hennerich | 4fecc20 | 2011-08-02 15:41:37 -0700 | [diff] [blame] | 253 | u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) | |
| 254 | AD7879_PM(AD7879_PM_SHUTDOWN); |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 255 | disable_irq(ts->irq); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 256 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 257 | if (del_timer_sync(&ts->timer)) |
| 258 | ad7879_ts_event_release(ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 259 | |
Michael Hennerich | 4fecc20 | 2011-08-02 15:41:37 -0700 | [diff] [blame] | 260 | ad7879_write(ts, AD7879_REG_CTRL2, reg); |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 261 | } |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 262 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 263 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 264 | static int ad7879_open(struct input_dev *input) |
| 265 | { |
| 266 | struct ad7879 *ts = input_get_drvdata(input); |
| 267 | |
| 268 | /* protected by input->mutex */ |
| 269 | if (!ts->disabled && !ts->suspended) |
| 270 | __ad7879_enable(ts); |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static void ad7879_close(struct input_dev* input) |
| 276 | { |
| 277 | struct ad7879 *ts = input_get_drvdata(input); |
| 278 | |
| 279 | /* protected by input->mutex */ |
| 280 | if (!ts->disabled && !ts->suspended) |
| 281 | __ad7879_disable(ts); |
| 282 | } |
| 283 | |
| 284 | void ad7879_suspend(struct ad7879 *ts) |
| 285 | { |
| 286 | mutex_lock(&ts->input->mutex); |
| 287 | |
| 288 | if (!ts->suspended && !ts->disabled && ts->input->users) |
| 289 | __ad7879_disable(ts); |
| 290 | |
| 291 | ts->suspended = true; |
| 292 | |
| 293 | mutex_unlock(&ts->input->mutex); |
| 294 | } |
| 295 | EXPORT_SYMBOL(ad7879_suspend); |
| 296 | |
| 297 | void ad7879_resume(struct ad7879 *ts) |
| 298 | { |
| 299 | mutex_lock(&ts->input->mutex); |
| 300 | |
| 301 | if (ts->suspended && !ts->disabled && ts->input->users) |
| 302 | __ad7879_enable(ts); |
| 303 | |
| 304 | ts->suspended = false; |
| 305 | |
| 306 | mutex_unlock(&ts->input->mutex); |
| 307 | } |
| 308 | EXPORT_SYMBOL(ad7879_resume); |
| 309 | |
| 310 | static void ad7879_toggle(struct ad7879 *ts, bool disable) |
| 311 | { |
| 312 | mutex_lock(&ts->input->mutex); |
| 313 | |
| 314 | if (!ts->suspended && ts->input->users != 0) { |
| 315 | |
| 316 | if (disable) { |
| 317 | if (ts->disabled) |
| 318 | __ad7879_enable(ts); |
| 319 | } else { |
| 320 | if (!ts->disabled) |
| 321 | __ad7879_disable(ts); |
| 322 | } |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 325 | ts->disabled = disable; |
| 326 | |
| 327 | mutex_unlock(&ts->input->mutex); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 328 | } |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 329 | |
| 330 | static ssize_t ad7879_disable_show(struct device *dev, |
| 331 | struct device_attribute *attr, char *buf) |
| 332 | { |
| 333 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 334 | |
| 335 | return sprintf(buf, "%u\n", ts->disabled); |
| 336 | } |
| 337 | |
| 338 | static ssize_t ad7879_disable_store(struct device *dev, |
| 339 | struct device_attribute *attr, |
| 340 | const char *buf, size_t count) |
| 341 | { |
| 342 | struct ad7879 *ts = dev_get_drvdata(dev); |
| 343 | unsigned long val; |
| 344 | int error; |
| 345 | |
| 346 | error = strict_strtoul(buf, 10, &val); |
| 347 | if (error) |
| 348 | return error; |
| 349 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 350 | ad7879_toggle(ts, val); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 351 | |
| 352 | return count; |
| 353 | } |
| 354 | |
| 355 | static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); |
| 356 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 357 | static struct attribute *ad7879_attributes[] = { |
| 358 | &dev_attr_disable.attr, |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 359 | NULL |
| 360 | }; |
| 361 | |
| 362 | static const struct attribute_group ad7879_attr_group = { |
| 363 | .attrs = ad7879_attributes, |
| 364 | }; |
| 365 | |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 366 | #ifdef CONFIG_GPIOLIB |
| 367 | static int ad7879_gpio_direction_input(struct gpio_chip *chip, |
| 368 | unsigned gpio) |
| 369 | { |
| 370 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
| 371 | int err; |
| 372 | |
| 373 | mutex_lock(&ts->mutex); |
| 374 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL; |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 375 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 376 | mutex_unlock(&ts->mutex); |
| 377 | |
| 378 | return err; |
| 379 | } |
| 380 | |
| 381 | static int ad7879_gpio_direction_output(struct gpio_chip *chip, |
| 382 | unsigned gpio, int level) |
| 383 | { |
| 384 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
| 385 | int err; |
| 386 | |
| 387 | mutex_lock(&ts->mutex); |
| 388 | ts->cmd_crtl2 &= ~AD7879_GPIODIR; |
| 389 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL; |
| 390 | if (level) |
| 391 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; |
| 392 | else |
| 393 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; |
| 394 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 395 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 396 | mutex_unlock(&ts->mutex); |
| 397 | |
| 398 | return err; |
| 399 | } |
| 400 | |
| 401 | static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio) |
| 402 | { |
| 403 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
| 404 | u16 val; |
| 405 | |
| 406 | mutex_lock(&ts->mutex); |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 407 | val = ad7879_read(ts, AD7879_REG_CTRL2); |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 408 | mutex_unlock(&ts->mutex); |
| 409 | |
| 410 | return !!(val & AD7879_GPIO_DATA); |
| 411 | } |
| 412 | |
| 413 | static void ad7879_gpio_set_value(struct gpio_chip *chip, |
| 414 | unsigned gpio, int value) |
| 415 | { |
| 416 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
| 417 | |
| 418 | mutex_lock(&ts->mutex); |
| 419 | if (value) |
| 420 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; |
| 421 | else |
| 422 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; |
| 423 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 424 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 425 | mutex_unlock(&ts->mutex); |
| 426 | } |
| 427 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 428 | static int ad7879_gpio_add(struct ad7879 *ts, |
| 429 | const struct ad7879_platform_data *pdata) |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 430 | { |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 431 | int ret = 0; |
| 432 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 433 | mutex_init(&ts->mutex); |
| 434 | |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 435 | if (pdata->gpio_export) { |
| 436 | ts->gc.direction_input = ad7879_gpio_direction_input; |
| 437 | ts->gc.direction_output = ad7879_gpio_direction_output; |
| 438 | ts->gc.get = ad7879_gpio_get_value; |
| 439 | ts->gc.set = ad7879_gpio_set_value; |
| 440 | ts->gc.can_sleep = 1; |
| 441 | ts->gc.base = pdata->gpio_base; |
| 442 | ts->gc.ngpio = 1; |
| 443 | ts->gc.label = "AD7879-GPIO"; |
| 444 | ts->gc.owner = THIS_MODULE; |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 445 | ts->gc.dev = ts->dev; |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 446 | |
| 447 | ret = gpiochip_add(&ts->gc); |
| 448 | if (ret) |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 449 | dev_err(ts->dev, "failed to register gpio %d\n", |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 450 | ts->gc.base); |
| 451 | } |
| 452 | |
| 453 | return ret; |
| 454 | } |
| 455 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 456 | static void ad7879_gpio_remove(struct ad7879 *ts) |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 457 | { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 458 | const struct ad7879_platform_data *pdata = ts->dev->platform_data; |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 459 | int ret; |
| 460 | |
| 461 | if (pdata->gpio_export) { |
| 462 | ret = gpiochip_remove(&ts->gc); |
| 463 | if (ret) |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 464 | dev_err(ts->dev, "failed to remove gpio %d\n", |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 465 | ts->gc.base); |
| 466 | } |
| 467 | } |
| 468 | #else |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 469 | static inline int ad7879_gpio_add(struct ad7879 *ts, |
| 470 | const struct ad7879_platform_data *pdata) |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 471 | { |
| 472 | return 0; |
| 473 | } |
| 474 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 475 | static inline void ad7879_gpio_remove(struct ad7879 *ts) |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 476 | { |
| 477 | } |
| 478 | #endif |
| 479 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 480 | struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq, |
| 481 | const struct ad7879_bus_ops *bops) |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 482 | { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 483 | struct ad7879_platform_data *pdata = dev->platform_data; |
| 484 | struct ad7879 *ts; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 485 | struct input_dev *input_dev; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 486 | int err; |
| 487 | u16 revid; |
| 488 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 489 | if (!irq) { |
| 490 | dev_err(dev, "no IRQ?\n"); |
| 491 | err = -EINVAL; |
| 492 | goto err_out; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | if (!pdata) { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 496 | dev_err(dev, "no platform data?\n"); |
| 497 | err = -EINVAL; |
| 498 | goto err_out; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 501 | ts = kzalloc(sizeof(*ts), GFP_KERNEL); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 502 | input_dev = input_allocate_device(); |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 503 | if (!ts || !input_dev) { |
| 504 | err = -ENOMEM; |
| 505 | goto err_free_mem; |
| 506 | } |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 507 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 508 | ts->bops = bops; |
| 509 | ts->dev = dev; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 510 | ts->input = input_dev; |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 511 | ts->irq = irq; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 512 | |
| 513 | setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 514 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 515 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; |
| 516 | ts->pressure_max = pdata->pressure_max ? : ~0; |
| 517 | |
| 518 | ts->first_conversion_delay = pdata->first_conversion_delay; |
| 519 | ts->acquisition_time = pdata->acquisition_time; |
| 520 | ts->averaging = pdata->averaging; |
| 521 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; |
| 522 | ts->median = pdata->median; |
| 523 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 524 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 525 | |
| 526 | input_dev->name = "AD7879 Touchscreen"; |
| 527 | input_dev->phys = ts->phys; |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 528 | input_dev->dev.parent = dev; |
| 529 | input_dev->id.bustype = bops->bustype; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 530 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 531 | input_dev->open = ad7879_open; |
| 532 | input_dev->close = ad7879_close; |
| 533 | |
| 534 | input_set_drvdata(input_dev, ts); |
| 535 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 536 | __set_bit(EV_ABS, input_dev->evbit); |
| 537 | __set_bit(ABS_X, input_dev->absbit); |
| 538 | __set_bit(ABS_Y, input_dev->absbit); |
| 539 | __set_bit(ABS_PRESSURE, input_dev->absbit); |
| 540 | |
Michael Hennerich | 963ce8a | 2010-06-30 14:51:10 -0700 | [diff] [blame] | 541 | __set_bit(EV_KEY, input_dev->evbit); |
| 542 | __set_bit(BTN_TOUCH, input_dev->keybit); |
| 543 | |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 544 | input_set_abs_params(input_dev, ABS_X, |
| 545 | pdata->x_min ? : 0, |
| 546 | pdata->x_max ? : MAX_12BIT, |
| 547 | 0, 0); |
| 548 | input_set_abs_params(input_dev, ABS_Y, |
| 549 | pdata->y_min ? : 0, |
| 550 | pdata->y_max ? : MAX_12BIT, |
| 551 | 0, 0); |
| 552 | input_set_abs_params(input_dev, ABS_PRESSURE, |
| 553 | pdata->pressure_min, pdata->pressure_max, 0, 0); |
| 554 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 555 | err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 556 | if (err < 0) { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 557 | dev_err(dev, "Failed to write %s\n", input_dev->name); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 558 | goto err_free_mem; |
| 559 | } |
| 560 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 561 | revid = ad7879_read(ts, AD7879_REG_REVID); |
| 562 | input_dev->id.product = (revid & 0xff); |
| 563 | input_dev->id.version = revid >> 8; |
| 564 | if (input_dev->id.product != devid) { |
| 565 | dev_err(dev, "Failed to probe %s (%x vs %x)\n", |
| 566 | input_dev->name, devid, revid); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 567 | err = -ENODEV; |
| 568 | goto err_free_mem; |
| 569 | } |
| 570 | |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 571 | ts->cmd_crtl3 = AD7879_YPLUS_BIT | |
| 572 | AD7879_XPLUS_BIT | |
| 573 | AD7879_Z2_BIT | |
| 574 | AD7879_Z1_BIT | |
| 575 | AD7879_TEMPMASK_BIT | |
| 576 | AD7879_AUXVBATMASK_BIT | |
| 577 | AD7879_GPIOALERTMASK_BIT; |
| 578 | |
| 579 | ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR | |
| 580 | AD7879_AVG(ts->averaging) | |
| 581 | AD7879_MFS(ts->median) | |
| 582 | AD7879_FCD(ts->first_conversion_delay); |
| 583 | |
| 584 | ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 | |
| 585 | AD7879_ACQ(ts->acquisition_time) | |
| 586 | AD7879_TMR(ts->pen_down_acc_interval); |
| 587 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 588 | err = request_threaded_irq(ts->irq, NULL, ad7879_irq, |
Dmitry Torokhov | 7cd7a82 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 589 | IRQF_TRIGGER_FALLING, |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 590 | dev_name(dev), ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 591 | if (err) { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 592 | dev_err(dev, "irq %d busy?\n", ts->irq); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 593 | goto err_free_mem; |
| 594 | } |
| 595 | |
Dmitry Torokhov | 14fbbc3 | 2010-06-30 14:50:51 -0700 | [diff] [blame] | 596 | __ad7879_disable(ts); |
| 597 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 598 | err = sysfs_create_group(&dev->kobj, &ad7879_attr_group); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 599 | if (err) |
| 600 | goto err_free_irq; |
| 601 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 602 | err = ad7879_gpio_add(ts, pdata); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 603 | if (err) |
| 604 | goto err_remove_attr; |
| 605 | |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 606 | err = input_register_device(input_dev); |
| 607 | if (err) |
| 608 | goto err_remove_gpio; |
| 609 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 610 | return ts; |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 611 | |
Michael Hennerich | ec51b7f | 2010-01-19 00:27:58 -0800 | [diff] [blame] | 612 | err_remove_gpio: |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 613 | ad7879_gpio_remove(ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 614 | err_remove_attr: |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 615 | sysfs_remove_group(&dev->kobj, &ad7879_attr_group); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 616 | err_free_irq: |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 617 | free_irq(ts->irq, ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 618 | err_free_mem: |
| 619 | input_free_device(input_dev); |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 620 | kfree(ts); |
| 621 | err_out: |
| 622 | return ERR_PTR(err); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 623 | } |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 624 | EXPORT_SYMBOL(ad7879_probe); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 625 | |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 626 | void ad7879_remove(struct ad7879 *ts) |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 627 | { |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 628 | ad7879_gpio_remove(ts); |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 629 | sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group); |
| 630 | free_irq(ts->irq, ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 631 | input_unregister_device(ts->input); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 632 | kfree(ts); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 633 | } |
Mike Frysinger | 4397c98 | 2010-06-30 01:40:52 -0700 | [diff] [blame] | 634 | EXPORT_SYMBOL(ad7879_remove); |
Michael Hennerich | b4be468 | 2009-03-09 20:12:52 -0700 | [diff] [blame] | 635 | |
| 636 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 637 | MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver"); |
| 638 | MODULE_LICENSE("GPL"); |