Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Touchscreen driver for Dialog Semiconductor DA9034 |
| 3 | * |
| 4 | * Copyright (C) 2006-2008 Marvell International Ltd. |
| 5 | * Fengwei Yin <fengwei.yin@marvell.com> |
Eric Miao | 93ff27c | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 6 | * Bin Yang <bin.yang@marvell.com> |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 7 | * Eric Miao <eric.miao@marvell.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 16 | #include <linux/delay.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/input.h> |
Alan Cox | 30aafdb | 2009-01-07 11:40:03 +0000 | [diff] [blame] | 19 | #include <linux/workqueue.h> |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 20 | #include <linux/mfd/da903x.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 22 | |
| 23 | #define DA9034_MANUAL_CTRL 0x50 |
| 24 | #define DA9034_LDO_ADC_EN (1 << 4) |
| 25 | |
| 26 | #define DA9034_AUTO_CTRL1 0x51 |
| 27 | |
| 28 | #define DA9034_AUTO_CTRL2 0x52 |
| 29 | #define DA9034_AUTO_TSI_EN (1 << 3) |
| 30 | #define DA9034_PEN_DETECT (1 << 4) |
| 31 | |
| 32 | #define DA9034_TSI_CTRL1 0x53 |
| 33 | #define DA9034_TSI_CTRL2 0x54 |
| 34 | #define DA9034_TSI_X_MSB 0x6c |
| 35 | #define DA9034_TSI_Y_MSB 0x6d |
| 36 | #define DA9034_TSI_XY_LSB 0x6e |
| 37 | |
| 38 | enum { |
| 39 | STATE_IDLE, /* wait for pendown */ |
| 40 | STATE_BUSY, /* TSI busy sampling */ |
| 41 | STATE_STOP, /* sample available */ |
| 42 | STATE_WAIT, /* Wait to start next sample */ |
| 43 | }; |
| 44 | |
| 45 | enum { |
| 46 | EVENT_PEN_DOWN, |
| 47 | EVENT_PEN_UP, |
| 48 | EVENT_TSI_READY, |
| 49 | EVENT_TIMEDOUT, |
| 50 | }; |
| 51 | |
| 52 | struct da9034_touch { |
| 53 | struct device *da9034_dev; |
| 54 | struct input_dev *input_dev; |
| 55 | |
| 56 | struct delayed_work tsi_work; |
| 57 | struct notifier_block notifier; |
| 58 | |
| 59 | int state; |
| 60 | |
| 61 | int interval_ms; |
| 62 | int x_inverted; |
| 63 | int y_inverted; |
| 64 | |
| 65 | int last_x; |
| 66 | int last_y; |
| 67 | }; |
| 68 | |
| 69 | static inline int is_pen_down(struct da9034_touch *touch) |
| 70 | { |
| 71 | return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN); |
| 72 | } |
| 73 | |
| 74 | static inline int detect_pen_down(struct da9034_touch *touch, int on) |
| 75 | { |
| 76 | if (on) |
| 77 | return da903x_set_bits(touch->da9034_dev, |
| 78 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); |
| 79 | else |
| 80 | return da903x_clr_bits(touch->da9034_dev, |
| 81 | DA9034_AUTO_CTRL2, DA9034_PEN_DETECT); |
| 82 | } |
| 83 | |
| 84 | static int read_tsi(struct da9034_touch *touch) |
| 85 | { |
| 86 | uint8_t _x, _y, _v; |
| 87 | int ret; |
| 88 | |
| 89 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x); |
| 90 | if (ret) |
| 91 | return ret; |
| 92 | |
| 93 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y); |
| 94 | if (ret) |
| 95 | return ret; |
| 96 | |
| 97 | ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v); |
| 98 | if (ret) |
| 99 | return ret; |
| 100 | |
| 101 | touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3); |
| 102 | touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2); |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static inline int start_tsi(struct da9034_touch *touch) |
| 108 | { |
| 109 | return da903x_set_bits(touch->da9034_dev, |
| 110 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); |
| 111 | } |
| 112 | |
| 113 | static inline int stop_tsi(struct da9034_touch *touch) |
| 114 | { |
| 115 | return da903x_clr_bits(touch->da9034_dev, |
| 116 | DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN); |
| 117 | } |
| 118 | |
| 119 | static inline void report_pen_down(struct da9034_touch *touch) |
| 120 | { |
| 121 | int x = touch->last_x; |
| 122 | int y = touch->last_y; |
| 123 | |
| 124 | x &= 0xfff; |
| 125 | if (touch->x_inverted) |
| 126 | x = 1024 - x; |
| 127 | y &= 0xfff; |
| 128 | if (touch->y_inverted) |
| 129 | y = 1024 - y; |
| 130 | |
| 131 | input_report_abs(touch->input_dev, ABS_X, x); |
| 132 | input_report_abs(touch->input_dev, ABS_Y, y); |
| 133 | input_report_key(touch->input_dev, BTN_TOUCH, 1); |
| 134 | |
| 135 | input_sync(touch->input_dev); |
| 136 | } |
| 137 | |
| 138 | static inline void report_pen_up(struct da9034_touch *touch) |
| 139 | { |
| 140 | input_report_key(touch->input_dev, BTN_TOUCH, 0); |
| 141 | input_sync(touch->input_dev); |
| 142 | } |
| 143 | |
| 144 | static void da9034_event_handler(struct da9034_touch *touch, int event) |
| 145 | { |
| 146 | int err; |
| 147 | |
| 148 | switch (touch->state) { |
| 149 | case STATE_IDLE: |
| 150 | if (event != EVENT_PEN_DOWN) |
| 151 | break; |
| 152 | |
| 153 | /* Enable auto measurement of the TSI, this will |
| 154 | * automatically disable pen down detection |
| 155 | */ |
| 156 | err = start_tsi(touch); |
| 157 | if (err) |
| 158 | goto err_reset; |
| 159 | |
| 160 | touch->state = STATE_BUSY; |
| 161 | break; |
| 162 | |
| 163 | case STATE_BUSY: |
| 164 | if (event != EVENT_TSI_READY) |
| 165 | break; |
| 166 | |
| 167 | err = read_tsi(touch); |
| 168 | if (err) |
| 169 | goto err_reset; |
| 170 | |
| 171 | /* Disable auto measurement of the TSI, so that |
| 172 | * pen down status will be available |
| 173 | */ |
| 174 | err = stop_tsi(touch); |
| 175 | if (err) |
| 176 | goto err_reset; |
| 177 | |
| 178 | touch->state = STATE_STOP; |
Eric Miao | 7f6d5ff | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 179 | |
| 180 | /* FIXME: PEN_{UP/DOWN} events are expected to be |
| 181 | * available by stopping TSI, but this is found not |
| 182 | * always true, delay and simulate such an event |
| 183 | * here is more reliable |
| 184 | */ |
| 185 | mdelay(1); |
| 186 | da9034_event_handler(touch, |
| 187 | is_pen_down(touch) ? EVENT_PEN_DOWN : |
| 188 | EVENT_PEN_UP); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 189 | break; |
| 190 | |
| 191 | case STATE_STOP: |
| 192 | if (event == EVENT_PEN_DOWN) { |
| 193 | report_pen_down(touch); |
| 194 | schedule_delayed_work(&touch->tsi_work, |
| 195 | msecs_to_jiffies(touch->interval_ms)); |
| 196 | touch->state = STATE_WAIT; |
| 197 | } |
| 198 | |
| 199 | if (event == EVENT_PEN_UP) { |
| 200 | report_pen_up(touch); |
| 201 | touch->state = STATE_IDLE; |
| 202 | } |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 203 | break; |
| 204 | |
| 205 | case STATE_WAIT: |
| 206 | if (event != EVENT_TIMEDOUT) |
| 207 | break; |
| 208 | |
| 209 | if (is_pen_down(touch)) { |
| 210 | start_tsi(touch); |
| 211 | touch->state = STATE_BUSY; |
Eric Miao | 7f6d5ff | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 212 | } else { |
| 213 | report_pen_up(touch); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 214 | touch->state = STATE_IDLE; |
Eric Miao | 7f6d5ff | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 215 | } |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 216 | break; |
| 217 | } |
| 218 | return; |
| 219 | |
| 220 | err_reset: |
| 221 | touch->state = STATE_IDLE; |
| 222 | stop_tsi(touch); |
| 223 | detect_pen_down(touch, 1); |
| 224 | } |
| 225 | |
| 226 | static void da9034_tsi_work(struct work_struct *work) |
| 227 | { |
| 228 | struct da9034_touch *touch = |
| 229 | container_of(work, struct da9034_touch, tsi_work.work); |
| 230 | |
| 231 | da9034_event_handler(touch, EVENT_TIMEDOUT); |
| 232 | } |
| 233 | |
| 234 | static int da9034_touch_notifier(struct notifier_block *nb, |
| 235 | unsigned long event, void *data) |
| 236 | { |
| 237 | struct da9034_touch *touch = |
| 238 | container_of(nb, struct da9034_touch, notifier); |
| 239 | |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 240 | if (event & DA9034_EVENT_TSI_READY) |
| 241 | da9034_event_handler(touch, EVENT_TSI_READY); |
| 242 | |
Eric Miao | 7f6d5ff | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 243 | if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE) |
| 244 | da9034_event_handler(touch, EVENT_PEN_DOWN); |
| 245 | |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static int da9034_touch_open(struct input_dev *dev) |
| 250 | { |
| 251 | struct da9034_touch *touch = input_get_drvdata(dev); |
| 252 | int ret; |
| 253 | |
| 254 | ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier, |
| 255 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); |
| 256 | if (ret) |
| 257 | return -EBUSY; |
| 258 | |
| 259 | /* Enable ADC LDO */ |
| 260 | ret = da903x_set_bits(touch->da9034_dev, |
| 261 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); |
| 262 | if (ret) |
| 263 | return ret; |
| 264 | |
| 265 | /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */ |
| 266 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b); |
| 267 | if (ret) |
| 268 | return ret; |
| 269 | |
| 270 | ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00); |
| 271 | if (ret) |
| 272 | return ret; |
| 273 | |
| 274 | touch->state = STATE_IDLE; |
| 275 | detect_pen_down(touch, 1); |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static void da9034_touch_close(struct input_dev *dev) |
| 281 | { |
| 282 | struct da9034_touch *touch = input_get_drvdata(dev); |
| 283 | |
| 284 | da903x_unregister_notifier(touch->da9034_dev, &touch->notifier, |
| 285 | DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY); |
| 286 | |
| 287 | cancel_delayed_work_sync(&touch->tsi_work); |
| 288 | |
| 289 | touch->state = STATE_IDLE; |
| 290 | stop_tsi(touch); |
| 291 | detect_pen_down(touch, 0); |
| 292 | |
| 293 | /* Disable ADC LDO */ |
| 294 | da903x_clr_bits(touch->da9034_dev, |
| 295 | DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN); |
| 296 | } |
| 297 | |
| 298 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 299 | static int da9034_touch_probe(struct platform_device *pdev) |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 300 | { |
Jingoo Han | c838cb3 | 2013-12-05 19:21:10 -0800 | [diff] [blame] | 301 | struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 302 | struct da9034_touch *touch; |
| 303 | struct input_dev *input_dev; |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 304 | int error; |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 305 | |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 306 | touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch), |
| 307 | GFP_KERNEL); |
| 308 | if (!touch) { |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 309 | dev_err(&pdev->dev, "failed to allocate driver data\n"); |
| 310 | return -ENOMEM; |
| 311 | } |
| 312 | |
| 313 | touch->da9034_dev = pdev->dev.parent; |
| 314 | |
| 315 | if (pdata) { |
| 316 | touch->interval_ms = pdata->interval_ms; |
| 317 | touch->x_inverted = pdata->x_inverted; |
| 318 | touch->y_inverted = pdata->y_inverted; |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 319 | } else { |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 320 | /* fallback into default */ |
| 321 | touch->interval_ms = 10; |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 322 | } |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 323 | |
| 324 | INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work); |
| 325 | touch->notifier.notifier_call = da9034_touch_notifier; |
| 326 | |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 327 | input_dev = devm_input_allocate_device(&pdev->dev); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 328 | if (!input_dev) { |
| 329 | dev_err(&pdev->dev, "failed to allocate input device\n"); |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 330 | return -ENOMEM; |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | input_dev->name = pdev->name; |
| 334 | input_dev->open = da9034_touch_open; |
| 335 | input_dev->close = da9034_touch_close; |
| 336 | input_dev->dev.parent = &pdev->dev; |
| 337 | |
| 338 | __set_bit(EV_ABS, input_dev->evbit); |
| 339 | __set_bit(ABS_X, input_dev->absbit); |
| 340 | __set_bit(ABS_Y, input_dev->absbit); |
| 341 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); |
| 342 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); |
| 343 | |
| 344 | __set_bit(EV_KEY, input_dev->evbit); |
| 345 | __set_bit(BTN_TOUCH, input_dev->keybit); |
| 346 | |
| 347 | touch->input_dev = input_dev; |
| 348 | input_set_drvdata(input_dev, touch); |
| 349 | |
Himangi Saraogi | 4f8edc3 | 2014-05-21 08:27:06 -0700 | [diff] [blame] | 350 | error = input_register_device(input_dev); |
| 351 | if (error) |
| 352 | return error; |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 353 | |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static struct platform_driver da9034_touch_driver = { |
| 358 | .driver = { |
| 359 | .name = "da9034-touch", |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 360 | }, |
| 361 | .probe = da9034_touch_probe, |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 362 | }; |
JJ Ding | cdcc96e | 2011-11-29 11:14:13 -0800 | [diff] [blame] | 363 | module_platform_driver(da9034_touch_driver); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 364 | |
| 365 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034"); |
Eric Miao | 93ff27c | 2009-04-14 10:38:35 -0700 | [diff] [blame] | 366 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>"); |
Eric Miao | 9bcc00b | 2008-12-23 04:21:04 -0500 | [diff] [blame] | 367 | MODULE_LICENSE("GPL"); |
| 368 | MODULE_ALIAS("platform:da9034-touch"); |