Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Core Source for: |
| 3 | * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers. |
| 4 | * For use with Cypress Txx3xx parts. |
| 5 | * Supported parts include: |
| 6 | * CY8CTST341 |
| 7 | * CY8CTMA340 |
| 8 | * |
| 9 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. |
| 10 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * version 2, and only version 2, as published by the |
| 15 | * Free Software Foundation. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 25 | * |
| 26 | * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com> |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/input.h> |
| 32 | #include <linux/input/mt.h> |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 33 | #include <linux/input/touchscreen.h> |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 34 | #include <linux/gpio.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/slab.h> |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 37 | #include <linux/property.h> |
| 38 | #include <linux/gpio/consumer.h> |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 39 | |
| 40 | #include "cyttsp_core.h" |
| 41 | |
| 42 | /* Bootloader number of command keys */ |
| 43 | #define CY_NUM_BL_KEYS 8 |
| 44 | |
| 45 | /* helpers */ |
| 46 | #define GET_NUM_TOUCHES(x) ((x) & 0x0F) |
| 47 | #define IS_LARGE_AREA(x) (((x) & 0x10) >> 4) |
| 48 | #define IS_BAD_PKT(x) ((x) & 0x20) |
| 49 | #define IS_VALID_APP(x) ((x) & 0x01) |
| 50 | #define IS_OPERATIONAL_ERR(x) ((x) & 0x3F) |
| 51 | #define GET_HSTMODE(reg) (((reg) & 0x70) >> 4) |
| 52 | #define GET_BOOTLOADERMODE(reg) (((reg) & 0x10) >> 4) |
| 53 | |
| 54 | #define CY_REG_BASE 0x00 |
| 55 | #define CY_REG_ACT_DIST 0x1E |
| 56 | #define CY_REG_ACT_INTRVL 0x1D |
| 57 | #define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL + 1) |
| 58 | #define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT + 1) |
| 59 | #define CY_MAXZ 255 |
| 60 | #define CY_DELAY_DFLT 20 /* ms */ |
| 61 | #define CY_DELAY_MAX 500 |
| 62 | #define CY_ACT_DIST_DFLT 0xF8 |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 63 | #define CY_ACT_DIST_MASK 0x0F |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 64 | #define CY_HNDSHK_BIT 0x80 |
| 65 | /* device mode bits */ |
| 66 | #define CY_OPERATE_MODE 0x00 |
| 67 | #define CY_SYSINFO_MODE 0x10 |
| 68 | /* power mode select bits */ |
| 69 | #define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */ |
| 70 | #define CY_DEEP_SLEEP_MODE 0x02 |
| 71 | #define CY_LOW_POWER_MODE 0x04 |
| 72 | |
| 73 | /* Slots management */ |
| 74 | #define CY_MAX_FINGER 4 |
| 75 | #define CY_MAX_ID 16 |
| 76 | |
| 77 | static const u8 bl_command[] = { |
| 78 | 0x00, /* file offset */ |
| 79 | 0xFF, /* command */ |
| 80 | 0xA5, /* exit bootloader command */ |
| 81 | 0, 1, 2, 3, 4, 5, 6, 7 /* default keys */ |
| 82 | }; |
| 83 | |
| 84 | static int ttsp_read_block_data(struct cyttsp *ts, u8 command, |
| 85 | u8 length, void *buf) |
| 86 | { |
| 87 | int error; |
| 88 | int tries; |
| 89 | |
| 90 | for (tries = 0; tries < CY_NUM_RETRY; tries++) { |
Ferruh Yigit | 9664877 | 2013-06-30 18:46:56 -0700 | [diff] [blame] | 91 | error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command, |
| 92 | length, buf); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 93 | if (!error) |
| 94 | return 0; |
| 95 | |
| 96 | msleep(CY_DELAY_DFLT); |
| 97 | } |
| 98 | |
| 99 | return -EIO; |
| 100 | } |
| 101 | |
| 102 | static int ttsp_write_block_data(struct cyttsp *ts, u8 command, |
| 103 | u8 length, void *buf) |
| 104 | { |
| 105 | int error; |
| 106 | int tries; |
| 107 | |
| 108 | for (tries = 0; tries < CY_NUM_RETRY; tries++) { |
Ferruh Yigit | 9664877 | 2013-06-30 18:46:56 -0700 | [diff] [blame] | 109 | error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command, |
| 110 | length, buf); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 111 | if (!error) |
| 112 | return 0; |
| 113 | |
| 114 | msleep(CY_DELAY_DFLT); |
| 115 | } |
| 116 | |
| 117 | return -EIO; |
| 118 | } |
| 119 | |
| 120 | static int ttsp_send_command(struct cyttsp *ts, u8 cmd) |
| 121 | { |
| 122 | return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd); |
| 123 | } |
| 124 | |
Ferruh Yigit | fbd5e77 | 2013-05-23 10:04:36 -0700 | [diff] [blame] | 125 | static int cyttsp_handshake(struct cyttsp *ts) |
| 126 | { |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 127 | if (ts->use_hndshk) |
Ferruh Yigit | fbd5e77 | 2013-05-23 10:04:36 -0700 | [diff] [blame] | 128 | return ttsp_send_command(ts, |
| 129 | ts->xy_data.hst_mode ^ CY_HNDSHK_BIT); |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 134 | static int cyttsp_load_bl_regs(struct cyttsp *ts) |
| 135 | { |
| 136 | memset(&ts->bl_data, 0, sizeof(ts->bl_data)); |
| 137 | ts->bl_data.bl_status = 0x10; |
| 138 | |
| 139 | return ttsp_read_block_data(ts, CY_REG_BASE, |
| 140 | sizeof(ts->bl_data), &ts->bl_data); |
| 141 | } |
| 142 | |
| 143 | static int cyttsp_exit_bl_mode(struct cyttsp *ts) |
| 144 | { |
| 145 | int error; |
| 146 | u8 bl_cmd[sizeof(bl_command)]; |
| 147 | |
| 148 | memcpy(bl_cmd, bl_command, sizeof(bl_command)); |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 149 | if (ts->bl_keys) |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 150 | memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS], |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 151 | ts->bl_keys, CY_NUM_BL_KEYS); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 152 | |
| 153 | error = ttsp_write_block_data(ts, CY_REG_BASE, |
| 154 | sizeof(bl_cmd), bl_cmd); |
| 155 | if (error) |
| 156 | return error; |
| 157 | |
| 158 | /* wait for TTSP Device to complete the operation */ |
| 159 | msleep(CY_DELAY_DFLT); |
| 160 | |
| 161 | error = cyttsp_load_bl_regs(ts); |
| 162 | if (error) |
| 163 | return error; |
| 164 | |
| 165 | if (GET_BOOTLOADERMODE(ts->bl_data.bl_status)) |
| 166 | return -EIO; |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int cyttsp_set_operational_mode(struct cyttsp *ts) |
| 172 | { |
| 173 | int error; |
| 174 | |
| 175 | error = ttsp_send_command(ts, CY_OPERATE_MODE); |
| 176 | if (error) |
| 177 | return error; |
| 178 | |
| 179 | /* wait for TTSP Device to complete switch to Operational mode */ |
| 180 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
| 181 | sizeof(ts->xy_data), &ts->xy_data); |
| 182 | if (error) |
| 183 | return error; |
| 184 | |
Ferruh Yigit | fbd5e77 | 2013-05-23 10:04:36 -0700 | [diff] [blame] | 185 | error = cyttsp_handshake(ts); |
| 186 | if (error) |
| 187 | return error; |
| 188 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 189 | return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0; |
| 190 | } |
| 191 | |
| 192 | static int cyttsp_set_sysinfo_mode(struct cyttsp *ts) |
| 193 | { |
| 194 | int error; |
| 195 | |
| 196 | memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data)); |
| 197 | |
| 198 | /* switch to sysinfo mode */ |
| 199 | error = ttsp_send_command(ts, CY_SYSINFO_MODE); |
| 200 | if (error) |
| 201 | return error; |
| 202 | |
| 203 | /* read sysinfo registers */ |
| 204 | msleep(CY_DELAY_DFLT); |
| 205 | error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data), |
| 206 | &ts->sysinfo_data); |
| 207 | if (error) |
| 208 | return error; |
| 209 | |
Ferruh Yigit | fbd5e77 | 2013-05-23 10:04:36 -0700 | [diff] [blame] | 210 | error = cyttsp_handshake(ts); |
| 211 | if (error) |
| 212 | return error; |
| 213 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 214 | if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl) |
| 215 | return -EIO; |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int cyttsp_set_sysinfo_regs(struct cyttsp *ts) |
| 221 | { |
| 222 | int retval = 0; |
| 223 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 224 | if (ts->act_intrvl != CY_ACT_INTRVL_DFLT || |
| 225 | ts->tch_tmout != CY_TCH_TMOUT_DFLT || |
| 226 | ts->lp_intrvl != CY_LP_INTRVL_DFLT) { |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 227 | |
| 228 | u8 intrvl_ray[] = { |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 229 | ts->act_intrvl, |
| 230 | ts->tch_tmout, |
| 231 | ts->lp_intrvl |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 232 | }; |
| 233 | |
| 234 | /* set intrvl registers */ |
| 235 | retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL, |
| 236 | sizeof(intrvl_ray), intrvl_ray); |
| 237 | msleep(CY_DELAY_DFLT); |
| 238 | } |
| 239 | |
| 240 | return retval; |
| 241 | } |
| 242 | |
Oreste Salerno | 8fb81d2 | 2016-01-27 13:58:38 -0800 | [diff] [blame] | 243 | static void cyttsp_hard_reset(struct cyttsp *ts) |
| 244 | { |
| 245 | if (ts->reset_gpio) { |
| 246 | gpiod_set_value_cansleep(ts->reset_gpio, 1); |
| 247 | msleep(CY_DELAY_DFLT); |
| 248 | gpiod_set_value_cansleep(ts->reset_gpio, 0); |
| 249 | msleep(CY_DELAY_DFLT); |
| 250 | } |
| 251 | } |
| 252 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 253 | static int cyttsp_soft_reset(struct cyttsp *ts) |
| 254 | { |
| 255 | unsigned long timeout; |
| 256 | int retval; |
| 257 | |
| 258 | /* wait for interrupt to set ready completion */ |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 259 | reinit_completion(&ts->bl_ready); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 260 | ts->state = CY_BL_STATE; |
| 261 | |
| 262 | enable_irq(ts->irq); |
| 263 | |
| 264 | retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE); |
| 265 | if (retval) |
| 266 | goto out; |
| 267 | |
| 268 | timeout = wait_for_completion_timeout(&ts->bl_ready, |
| 269 | msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX)); |
| 270 | retval = timeout ? 0 : -EIO; |
| 271 | |
| 272 | out: |
| 273 | ts->state = CY_IDLE_STATE; |
| 274 | disable_irq(ts->irq); |
| 275 | return retval; |
| 276 | } |
| 277 | |
| 278 | static int cyttsp_act_dist_setup(struct cyttsp *ts) |
| 279 | { |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 280 | u8 act_dist_setup = ts->act_dist; |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 281 | |
| 282 | /* Init gesture; active distance setup */ |
| 283 | return ttsp_write_block_data(ts, CY_REG_ACT_DIST, |
| 284 | sizeof(act_dist_setup), &act_dist_setup); |
| 285 | } |
| 286 | |
| 287 | static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids) |
| 288 | { |
| 289 | ids[0] = xy_data->touch12_id >> 4; |
| 290 | ids[1] = xy_data->touch12_id & 0xF; |
| 291 | ids[2] = xy_data->touch34_id >> 4; |
| 292 | ids[3] = xy_data->touch34_id & 0xF; |
| 293 | } |
| 294 | |
| 295 | static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data, |
| 296 | int idx) |
| 297 | { |
| 298 | switch (idx) { |
| 299 | case 0: |
| 300 | return &xy_data->tch1; |
| 301 | case 1: |
| 302 | return &xy_data->tch2; |
| 303 | case 2: |
| 304 | return &xy_data->tch3; |
| 305 | case 3: |
| 306 | return &xy_data->tch4; |
| 307 | default: |
| 308 | return NULL; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | static void cyttsp_report_tchdata(struct cyttsp *ts) |
| 313 | { |
| 314 | struct cyttsp_xydata *xy_data = &ts->xy_data; |
| 315 | struct input_dev *input = ts->input; |
| 316 | int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat); |
| 317 | const struct cyttsp_tch *tch; |
| 318 | int ids[CY_MAX_ID]; |
| 319 | int i; |
| 320 | DECLARE_BITMAP(used, CY_MAX_ID); |
| 321 | |
| 322 | if (IS_LARGE_AREA(xy_data->tt_stat) == 1) { |
| 323 | /* terminate all active tracks */ |
| 324 | num_tch = 0; |
| 325 | dev_dbg(ts->dev, "%s: Large area detected\n", __func__); |
| 326 | } else if (num_tch > CY_MAX_FINGER) { |
| 327 | /* terminate all active tracks */ |
| 328 | num_tch = 0; |
| 329 | dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__); |
| 330 | } else if (IS_BAD_PKT(xy_data->tt_mode)) { |
| 331 | /* terminate all active tracks */ |
| 332 | num_tch = 0; |
| 333 | dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__); |
| 334 | } |
| 335 | |
| 336 | cyttsp_extract_track_ids(xy_data, ids); |
| 337 | |
| 338 | bitmap_zero(used, CY_MAX_ID); |
| 339 | |
| 340 | for (i = 0; i < num_tch; i++) { |
| 341 | tch = cyttsp_get_tch(xy_data, i); |
| 342 | |
| 343 | input_mt_slot(input, ids[i]); |
| 344 | input_mt_report_slot_state(input, MT_TOOL_FINGER, true); |
| 345 | input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x)); |
| 346 | input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y)); |
| 347 | input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z); |
| 348 | |
| 349 | __set_bit(ids[i], used); |
| 350 | } |
| 351 | |
| 352 | for (i = 0; i < CY_MAX_ID; i++) { |
| 353 | if (test_bit(i, used)) |
| 354 | continue; |
| 355 | |
| 356 | input_mt_slot(input, i); |
| 357 | input_mt_report_slot_state(input, MT_TOOL_FINGER, false); |
| 358 | } |
| 359 | |
| 360 | input_sync(input); |
| 361 | } |
| 362 | |
| 363 | static irqreturn_t cyttsp_irq(int irq, void *handle) |
| 364 | { |
| 365 | struct cyttsp *ts = handle; |
| 366 | int error; |
| 367 | |
| 368 | if (unlikely(ts->state == CY_BL_STATE)) { |
| 369 | complete(&ts->bl_ready); |
| 370 | goto out; |
| 371 | } |
| 372 | |
| 373 | /* Get touch data from CYTTSP device */ |
| 374 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
| 375 | sizeof(struct cyttsp_xydata), &ts->xy_data); |
| 376 | if (error) |
| 377 | goto out; |
| 378 | |
| 379 | /* provide flow control handshake */ |
Ferruh Yigit | fbd5e77 | 2013-05-23 10:04:36 -0700 | [diff] [blame] | 380 | error = cyttsp_handshake(ts); |
| 381 | if (error) |
| 382 | goto out; |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 383 | |
| 384 | if (unlikely(ts->state == CY_IDLE_STATE)) |
| 385 | goto out; |
| 386 | |
| 387 | if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) { |
| 388 | /* |
| 389 | * TTSP device has reset back to bootloader mode. |
| 390 | * Restore to operational mode. |
| 391 | */ |
| 392 | error = cyttsp_exit_bl_mode(ts); |
| 393 | if (error) { |
| 394 | dev_err(ts->dev, |
| 395 | "Could not return to operational mode, err: %d\n", |
| 396 | error); |
| 397 | ts->state = CY_IDLE_STATE; |
| 398 | } |
| 399 | } else { |
| 400 | cyttsp_report_tchdata(ts); |
| 401 | } |
| 402 | |
| 403 | out: |
| 404 | return IRQ_HANDLED; |
| 405 | } |
| 406 | |
| 407 | static int cyttsp_power_on(struct cyttsp *ts) |
| 408 | { |
| 409 | int error; |
| 410 | |
| 411 | error = cyttsp_soft_reset(ts); |
| 412 | if (error) |
| 413 | return error; |
| 414 | |
| 415 | error = cyttsp_load_bl_regs(ts); |
| 416 | if (error) |
| 417 | return error; |
| 418 | |
| 419 | if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) && |
| 420 | IS_VALID_APP(ts->bl_data.bl_status)) { |
| 421 | error = cyttsp_exit_bl_mode(ts); |
| 422 | if (error) |
| 423 | return error; |
| 424 | } |
| 425 | |
| 426 | if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE || |
| 427 | IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) { |
| 428 | return -ENODEV; |
| 429 | } |
| 430 | |
| 431 | error = cyttsp_set_sysinfo_mode(ts); |
| 432 | if (error) |
| 433 | return error; |
| 434 | |
| 435 | error = cyttsp_set_sysinfo_regs(ts); |
| 436 | if (error) |
| 437 | return error; |
| 438 | |
| 439 | error = cyttsp_set_operational_mode(ts); |
| 440 | if (error) |
| 441 | return error; |
| 442 | |
| 443 | /* init active distance */ |
| 444 | error = cyttsp_act_dist_setup(ts); |
| 445 | if (error) |
| 446 | return error; |
| 447 | |
| 448 | ts->state = CY_ACTIVE_STATE; |
| 449 | |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | static int cyttsp_enable(struct cyttsp *ts) |
| 454 | { |
| 455 | int error; |
| 456 | |
| 457 | /* |
| 458 | * The device firmware can wake on an I2C or SPI memory slave |
| 459 | * address match. So just reading a register is sufficient to |
| 460 | * wake up the device. The first read attempt will fail but it |
| 461 | * will wake it up making the second read attempt successful. |
| 462 | */ |
| 463 | error = ttsp_read_block_data(ts, CY_REG_BASE, |
| 464 | sizeof(ts->xy_data), &ts->xy_data); |
| 465 | if (error) |
| 466 | return error; |
| 467 | |
| 468 | if (GET_HSTMODE(ts->xy_data.hst_mode)) |
| 469 | return -EIO; |
| 470 | |
| 471 | enable_irq(ts->irq); |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static int cyttsp_disable(struct cyttsp *ts) |
| 477 | { |
| 478 | int error; |
| 479 | |
| 480 | error = ttsp_send_command(ts, CY_LOW_POWER_MODE); |
| 481 | if (error) |
| 482 | return error; |
| 483 | |
| 484 | disable_irq(ts->irq); |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
Jingoo Han | 02b6a58 | 2014-11-02 00:04:14 -0700 | [diff] [blame] | 489 | static int __maybe_unused cyttsp_suspend(struct device *dev) |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 490 | { |
| 491 | struct cyttsp *ts = dev_get_drvdata(dev); |
| 492 | int retval = 0; |
| 493 | |
| 494 | mutex_lock(&ts->input->mutex); |
| 495 | |
| 496 | if (ts->input->users) { |
| 497 | retval = cyttsp_disable(ts); |
| 498 | if (retval == 0) |
| 499 | ts->suspended = true; |
| 500 | } |
| 501 | |
| 502 | mutex_unlock(&ts->input->mutex); |
| 503 | |
| 504 | return retval; |
| 505 | } |
| 506 | |
Jingoo Han | 02b6a58 | 2014-11-02 00:04:14 -0700 | [diff] [blame] | 507 | static int __maybe_unused cyttsp_resume(struct device *dev) |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 508 | { |
| 509 | struct cyttsp *ts = dev_get_drvdata(dev); |
| 510 | |
| 511 | mutex_lock(&ts->input->mutex); |
| 512 | |
| 513 | if (ts->input->users) |
| 514 | cyttsp_enable(ts); |
| 515 | |
| 516 | ts->suspended = false; |
| 517 | |
| 518 | mutex_unlock(&ts->input->mutex); |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 523 | SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume); |
| 524 | EXPORT_SYMBOL_GPL(cyttsp_pm_ops); |
| 525 | |
| 526 | static int cyttsp_open(struct input_dev *dev) |
| 527 | { |
| 528 | struct cyttsp *ts = input_get_drvdata(dev); |
| 529 | int retval = 0; |
| 530 | |
| 531 | if (!ts->suspended) |
| 532 | retval = cyttsp_enable(ts); |
| 533 | |
| 534 | return retval; |
| 535 | } |
| 536 | |
| 537 | static void cyttsp_close(struct input_dev *dev) |
| 538 | { |
| 539 | struct cyttsp *ts = input_get_drvdata(dev); |
| 540 | |
| 541 | if (!ts->suspended) |
| 542 | cyttsp_disable(ts); |
| 543 | } |
| 544 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 545 | static int cyttsp_parse_properties(struct cyttsp *ts) |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 546 | { |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 547 | struct device *dev = ts->dev; |
| 548 | u32 dt_value; |
| 549 | int ret; |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 550 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 551 | ts->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL); |
| 552 | if (!ts->bl_keys) |
| 553 | return -ENOMEM; |
| 554 | |
| 555 | /* Set some default values */ |
| 556 | ts->use_hndshk = false; |
| 557 | ts->act_dist = CY_ACT_DIST_DFLT; |
| 558 | ts->act_intrvl = CY_ACT_INTRVL_DFLT; |
| 559 | ts->tch_tmout = CY_TCH_TMOUT_DFLT; |
| 560 | ts->lp_intrvl = CY_LP_INTRVL_DFLT; |
| 561 | |
| 562 | ret = device_property_read_u8_array(dev, "bootloader-key", |
| 563 | ts->bl_keys, CY_NUM_BL_KEYS); |
| 564 | if (ret) { |
| 565 | dev_err(dev, |
| 566 | "bootloader-key property could not be retrieved\n"); |
| 567 | return ret; |
| 568 | } |
| 569 | |
| 570 | ts->use_hndshk = device_property_present(dev, "use-handshake"); |
| 571 | |
| 572 | if (!device_property_read_u32(dev, "active-distance", &dt_value)) { |
| 573 | if (dt_value > 15) { |
| 574 | dev_err(dev, "active-distance (%u) must be [0-15]\n", |
| 575 | dt_value); |
| 576 | return -EINVAL; |
| 577 | } |
| 578 | ts->act_dist &= ~CY_ACT_DIST_MASK; |
| 579 | ts->act_dist |= dt_value; |
| 580 | } |
| 581 | |
| 582 | if (!device_property_read_u32(dev, "active-interval-ms", &dt_value)) { |
| 583 | if (dt_value > 255) { |
| 584 | dev_err(dev, "active-interval-ms (%u) must be [0-255]\n", |
| 585 | dt_value); |
| 586 | return -EINVAL; |
| 587 | } |
| 588 | ts->act_intrvl = dt_value; |
| 589 | } |
| 590 | |
| 591 | if (!device_property_read_u32(dev, "lowpower-interval-ms", &dt_value)) { |
| 592 | if (dt_value > 2550) { |
| 593 | dev_err(dev, "lowpower-interval-ms (%u) must be [0-2550]\n", |
| 594 | dt_value); |
| 595 | return -EINVAL; |
| 596 | } |
| 597 | /* Register value is expressed in 0.01s / bit */ |
| 598 | ts->lp_intrvl = dt_value / 10; |
| 599 | } |
| 600 | |
| 601 | if (!device_property_read_u32(dev, "touch-timeout-ms", &dt_value)) { |
| 602 | if (dt_value > 2550) { |
| 603 | dev_err(dev, "touch-timeout-ms (%u) must be [0-2550]\n", |
| 604 | dt_value); |
| 605 | return -EINVAL; |
| 606 | } |
| 607 | /* Register value is expressed in 0.01s / bit */ |
| 608 | ts->tch_tmout = dt_value / 10; |
| 609 | } |
| 610 | |
| 611 | return 0; |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 612 | } |
| 613 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 614 | struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops, |
| 615 | struct device *dev, int irq, size_t xfer_buf_size) |
| 616 | { |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 617 | struct cyttsp *ts; |
| 618 | struct input_dev *input_dev; |
| 619 | int error; |
| 620 | |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 621 | ts = devm_kzalloc(dev, sizeof(*ts) + xfer_buf_size, GFP_KERNEL); |
| 622 | if (!ts) |
| 623 | return ERR_PTR(-ENOMEM); |
| 624 | |
| 625 | input_dev = devm_input_allocate_device(dev); |
| 626 | if (!input_dev) |
| 627 | return ERR_PTR(-ENOMEM); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 628 | |
| 629 | ts->dev = dev; |
| 630 | ts->input = input_dev; |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 631 | ts->bus_ops = bus_ops; |
| 632 | ts->irq = irq; |
| 633 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 634 | ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); |
| 635 | if (IS_ERR(ts->reset_gpio)) { |
| 636 | error = PTR_ERR(ts->reset_gpio); |
| 637 | dev_err(dev, "Failed to request reset gpio, error %d\n", error); |
| 638 | return ERR_PTR(error); |
| 639 | } |
| 640 | |
| 641 | error = cyttsp_parse_properties(ts); |
| 642 | if (error) |
| 643 | return ERR_PTR(error); |
| 644 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 645 | init_completion(&ts->bl_ready); |
| 646 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); |
| 647 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 648 | input_dev->name = "Cypress TTSP TouchScreen"; |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 649 | input_dev->phys = ts->phys; |
| 650 | input_dev->id.bustype = bus_ops->bustype; |
| 651 | input_dev->dev.parent = ts->dev; |
| 652 | |
| 653 | input_dev->open = cyttsp_open; |
| 654 | input_dev->close = cyttsp_close; |
| 655 | |
| 656 | input_set_drvdata(input_dev, ts); |
| 657 | |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 658 | input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X); |
| 659 | input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y); |
Hans de Goede | ed7c987 | 2016-07-15 14:05:29 -0700 | [diff] [blame] | 660 | touchscreen_parse_properties(input_dev, true, NULL); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 661 | |
Oreste Salerno | 69a1240 | 2016-01-27 13:55:20 -0800 | [diff] [blame] | 662 | error = input_mt_init_slots(input_dev, CY_MAX_ID, 0); |
| 663 | if (error) { |
| 664 | dev_err(dev, "Unable to init MT slots.\n"); |
| 665 | return ERR_PTR(error); |
| 666 | } |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 667 | |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 668 | error = devm_request_threaded_irq(dev, ts->irq, NULL, cyttsp_irq, |
| 669 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
Oreste Salerno | 707b61b | 2016-01-27 13:55:43 -0800 | [diff] [blame] | 670 | "cyttsp", ts); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 671 | if (error) { |
| 672 | dev_err(ts->dev, "failed to request IRQ %d, err: %d\n", |
| 673 | ts->irq, error); |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 674 | return ERR_PTR(error); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 675 | } |
| 676 | |
| 677 | disable_irq(ts->irq); |
| 678 | |
Oreste Salerno | 8fb81d2 | 2016-01-27 13:58:38 -0800 | [diff] [blame] | 679 | cyttsp_hard_reset(ts); |
| 680 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 681 | error = cyttsp_power_on(ts); |
| 682 | if (error) |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 683 | return ERR_PTR(error); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 684 | |
| 685 | error = input_register_device(input_dev); |
| 686 | if (error) { |
| 687 | dev_err(ts->dev, "failed to register input device: %d\n", |
| 688 | error); |
Oreste Salerno | e4cf92b | 2016-01-27 13:53:33 -0800 | [diff] [blame] | 689 | return ERR_PTR(error); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 690 | } |
| 691 | |
| 692 | return ts; |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 693 | } |
| 694 | EXPORT_SYMBOL_GPL(cyttsp_probe); |
| 695 | |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 696 | MODULE_LICENSE("GPL"); |
| 697 | MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core"); |
| 698 | MODULE_AUTHOR("Cypress"); |