Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Synaptics touchpad with I2C interface |
| 3 | * |
| 4 | * Copyright (C) 2009 Compulab, Ltd. |
| 5 | * Mike Rapoport <mike@compulab.co.il> |
| 6 | * Igor Grinberg <grinberg@compulab.co.il> |
| 7 | * |
| 8 | * This file is subject to the terms and conditions of the GNU General Public |
| 9 | * License. See the file COPYING in the main directory of this archive for |
| 10 | * more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/i2c.h> |
| 15 | #include <linux/irq.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/input.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/workqueue.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Mark Brown | 87b2c7d | 2011-02-11 08:53:33 -0800 | [diff] [blame] | 21 | #include <linux/pm.h> |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 22 | |
| 23 | #define DRIVER_NAME "synaptics_i2c" |
| 24 | /* maximum product id is 15 characters */ |
| 25 | #define PRODUCT_ID_LENGTH 15 |
| 26 | #define REGISTER_LENGTH 8 |
| 27 | |
| 28 | /* |
| 29 | * after soft reset, we should wait for 1 ms |
| 30 | * before the device becomes operational |
| 31 | */ |
| 32 | #define SOFT_RESET_DELAY_MS 3 |
| 33 | /* and after hard reset, we should wait for max 500ms */ |
| 34 | #define HARD_RESET_DELAY_MS 500 |
| 35 | |
| 36 | /* Registers by SMBus address */ |
| 37 | #define PAGE_SEL_REG 0xff |
| 38 | #define DEVICE_STATUS_REG 0x09 |
| 39 | |
| 40 | /* Registers by RMI address */ |
| 41 | #define DEV_CONTROL_REG 0x0000 |
| 42 | #define INTERRUPT_EN_REG 0x0001 |
| 43 | #define ERR_STAT_REG 0x0002 |
| 44 | #define INT_REQ_STAT_REG 0x0003 |
| 45 | #define DEV_COMMAND_REG 0x0004 |
| 46 | |
| 47 | #define RMI_PROT_VER_REG 0x0200 |
| 48 | #define MANUFACT_ID_REG 0x0201 |
| 49 | #define PHYS_INT_VER_REG 0x0202 |
| 50 | #define PROD_PROPERTY_REG 0x0203 |
| 51 | #define INFO_QUERY_REG0 0x0204 |
| 52 | #define INFO_QUERY_REG1 (INFO_QUERY_REG0 + 1) |
| 53 | #define INFO_QUERY_REG2 (INFO_QUERY_REG0 + 2) |
| 54 | #define INFO_QUERY_REG3 (INFO_QUERY_REG0 + 3) |
| 55 | |
| 56 | #define PRODUCT_ID_REG0 0x0210 |
| 57 | #define PRODUCT_ID_REG1 (PRODUCT_ID_REG0 + 1) |
| 58 | #define PRODUCT_ID_REG2 (PRODUCT_ID_REG0 + 2) |
| 59 | #define PRODUCT_ID_REG3 (PRODUCT_ID_REG0 + 3) |
| 60 | #define PRODUCT_ID_REG4 (PRODUCT_ID_REG0 + 4) |
| 61 | #define PRODUCT_ID_REG5 (PRODUCT_ID_REG0 + 5) |
| 62 | #define PRODUCT_ID_REG6 (PRODUCT_ID_REG0 + 6) |
| 63 | #define PRODUCT_ID_REG7 (PRODUCT_ID_REG0 + 7) |
| 64 | #define PRODUCT_ID_REG8 (PRODUCT_ID_REG0 + 8) |
| 65 | #define PRODUCT_ID_REG9 (PRODUCT_ID_REG0 + 9) |
| 66 | #define PRODUCT_ID_REG10 (PRODUCT_ID_REG0 + 10) |
| 67 | #define PRODUCT_ID_REG11 (PRODUCT_ID_REG0 + 11) |
| 68 | #define PRODUCT_ID_REG12 (PRODUCT_ID_REG0 + 12) |
| 69 | #define PRODUCT_ID_REG13 (PRODUCT_ID_REG0 + 13) |
| 70 | #define PRODUCT_ID_REG14 (PRODUCT_ID_REG0 + 14) |
| 71 | #define PRODUCT_ID_REG15 (PRODUCT_ID_REG0 + 15) |
| 72 | |
| 73 | #define DATA_REG0 0x0400 |
| 74 | #define ABS_PRESSURE_REG 0x0401 |
| 75 | #define ABS_MSB_X_REG 0x0402 |
| 76 | #define ABS_LSB_X_REG (ABS_MSB_X_REG + 1) |
| 77 | #define ABS_MSB_Y_REG 0x0404 |
| 78 | #define ABS_LSB_Y_REG (ABS_MSB_Y_REG + 1) |
| 79 | #define REL_X_REG 0x0406 |
| 80 | #define REL_Y_REG 0x0407 |
| 81 | |
| 82 | #define DEV_QUERY_REG0 0x1000 |
| 83 | #define DEV_QUERY_REG1 (DEV_QUERY_REG0 + 1) |
| 84 | #define DEV_QUERY_REG2 (DEV_QUERY_REG0 + 2) |
| 85 | #define DEV_QUERY_REG3 (DEV_QUERY_REG0 + 3) |
| 86 | #define DEV_QUERY_REG4 (DEV_QUERY_REG0 + 4) |
| 87 | #define DEV_QUERY_REG5 (DEV_QUERY_REG0 + 5) |
| 88 | #define DEV_QUERY_REG6 (DEV_QUERY_REG0 + 6) |
| 89 | #define DEV_QUERY_REG7 (DEV_QUERY_REG0 + 7) |
| 90 | #define DEV_QUERY_REG8 (DEV_QUERY_REG0 + 8) |
| 91 | |
| 92 | #define GENERAL_2D_CONTROL_REG 0x1041 |
| 93 | #define SENSOR_SENSITIVITY_REG 0x1044 |
| 94 | #define SENS_MAX_POS_MSB_REG 0x1046 |
| 95 | #define SENS_MAX_POS_LSB_REG (SENS_MAX_POS_UPPER_REG + 1) |
| 96 | |
| 97 | /* Register bits */ |
| 98 | /* Device Control Register Bits */ |
| 99 | #define REPORT_RATE_1ST_BIT 6 |
| 100 | |
| 101 | /* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */ |
| 102 | #define F10_ABS_INT_ENA 0 |
| 103 | #define F10_REL_INT_ENA 1 |
| 104 | #define F20_INT_ENA 2 |
| 105 | |
| 106 | /* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */ |
| 107 | #define F10_ABS_INT_REQ 0 |
| 108 | #define F10_REL_INT_REQ 1 |
| 109 | #define F20_INT_REQ 2 |
| 110 | /* Device Status Register Bits (DEVICE_STATUS_REG) */ |
| 111 | #define STAT_CONFIGURED 6 |
| 112 | #define STAT_ERROR 7 |
| 113 | |
| 114 | /* Device Command Register Bits (DEV_COMMAND_REG) */ |
| 115 | #define RESET_COMMAND 0x01 |
| 116 | #define REZERO_COMMAND 0x02 |
| 117 | |
| 118 | /* Data Register 0 Bits (DATA_REG0) */ |
| 119 | #define GESTURE 3 |
| 120 | |
| 121 | /* Device Query Registers Bits */ |
| 122 | /* DEV_QUERY_REG3 */ |
| 123 | #define HAS_PALM_DETECT 1 |
| 124 | #define HAS_MULTI_FING 2 |
| 125 | #define HAS_SCROLLER 4 |
| 126 | #define HAS_2D_SCROLL 5 |
| 127 | |
| 128 | /* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */ |
| 129 | #define NO_DECELERATION 1 |
| 130 | #define REDUCE_REPORTING 3 |
| 131 | #define NO_FILTER 5 |
| 132 | |
| 133 | /* Function Masks */ |
| 134 | /* Device Control Register Masks (DEV_CONTROL_REG) */ |
| 135 | #define REPORT_RATE_MSK 0xc0 |
| 136 | #define SLEEP_MODE_MSK 0x07 |
| 137 | |
| 138 | /* Device Sleep Modes */ |
| 139 | #define FULL_AWAKE 0x0 |
| 140 | #define NORMAL_OP 0x1 |
| 141 | #define LOW_PWR_OP 0x2 |
| 142 | #define VERY_LOW_PWR_OP 0x3 |
| 143 | #define SENS_SLEEP 0x4 |
| 144 | #define SLEEP_MOD 0x5 |
| 145 | #define DEEP_SLEEP 0x6 |
| 146 | #define HIBERNATE 0x7 |
| 147 | |
| 148 | /* Interrupt Register Mask */ |
| 149 | /* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */ |
| 150 | #define INT_ENA_REQ_MSK 0x07 |
| 151 | #define INT_ENA_ABS_MSK 0x01 |
| 152 | #define INT_ENA_REL_MSK 0x02 |
| 153 | #define INT_ENA_F20_MSK 0x04 |
| 154 | |
| 155 | /* Device Status Register Masks (DEVICE_STATUS_REG) */ |
| 156 | #define CONFIGURED_MSK 0x40 |
| 157 | #define ERROR_MSK 0x80 |
| 158 | |
| 159 | /* Data Register 0 Masks */ |
| 160 | #define FINGER_WIDTH_MSK 0xf0 |
| 161 | #define GESTURE_MSK 0x08 |
| 162 | #define SENSOR_STATUS_MSK 0x07 |
| 163 | |
| 164 | /* |
| 165 | * MSB Position Register Masks |
| 166 | * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG | |
| 167 | * DEV_QUERY_REG3 | DEV_QUERY_REG5 |
| 168 | */ |
| 169 | #define MSB_POSITION_MSK 0x1f |
| 170 | |
| 171 | /* Device Query Registers Masks */ |
| 172 | |
| 173 | /* DEV_QUERY_REG2 */ |
| 174 | #define NUM_EXTRA_POS_MSK 0x07 |
| 175 | |
| 176 | /* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */ |
| 177 | #define THREAD_IRQ_SLEEP_SECS 2 |
| 178 | #define THREAD_IRQ_SLEEP_MSECS (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC) |
| 179 | |
| 180 | /* |
| 181 | * When in Polling mode and no data received for NO_DATA_THRES msecs |
| 182 | * reduce the polling rate to NO_DATA_SLEEP_MSECS |
| 183 | */ |
| 184 | #define NO_DATA_THRES (MSEC_PER_SEC) |
| 185 | #define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4) |
| 186 | |
| 187 | /* Control touchpad's No Deceleration option */ |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 188 | static bool no_decel = 1; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 189 | module_param(no_decel, bool, 0644); |
| 190 | MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)"); |
| 191 | |
| 192 | /* Control touchpad's Reduced Reporting option */ |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 193 | static bool reduce_report; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 194 | module_param(reduce_report, bool, 0644); |
| 195 | MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)"); |
| 196 | |
| 197 | /* Control touchpad's No Filter option */ |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 198 | static bool no_filter; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 199 | module_param(no_filter, bool, 0644); |
| 200 | MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)"); |
| 201 | |
| 202 | /* |
| 203 | * touchpad Attention line is Active Low and Open Drain, |
| 204 | * therefore should be connected to pulled up line |
| 205 | * and the irq configuration should be set to Falling Edge Trigger |
| 206 | */ |
| 207 | /* Control IRQ / Polling option */ |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 208 | static bool polling_req; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 209 | module_param(polling_req, bool, 0444); |
| 210 | MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)"); |
| 211 | |
| 212 | /* Control Polling Rate */ |
| 213 | static int scan_rate = 80; |
| 214 | module_param(scan_rate, int, 0644); |
| 215 | MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80"); |
| 216 | |
| 217 | /* The main device structure */ |
| 218 | struct synaptics_i2c { |
| 219 | struct i2c_client *client; |
| 220 | struct input_dev *input; |
| 221 | struct delayed_work dwork; |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 222 | spinlock_t lock; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 223 | int no_data_count; |
| 224 | int no_decel_param; |
| 225 | int reduce_report_param; |
| 226 | int no_filter_param; |
| 227 | int scan_rate_param; |
| 228 | int scan_ms; |
| 229 | }; |
| 230 | |
| 231 | static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate) |
| 232 | { |
| 233 | touch->scan_ms = MSEC_PER_SEC / scan_rate; |
| 234 | touch->scan_rate_param = scan_rate; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Driver's initial design makes no race condition possible on i2c bus, |
| 239 | * so there is no need in any locking. |
| 240 | * Keep it in mind, while playing with the code. |
| 241 | */ |
| 242 | static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg) |
| 243 | { |
| 244 | int ret; |
| 245 | |
| 246 | ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); |
| 247 | if (ret == 0) |
| 248 | ret = i2c_smbus_read_byte_data(client, reg & 0xff); |
| 249 | |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val) |
| 254 | { |
| 255 | int ret; |
| 256 | |
| 257 | ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); |
| 258 | if (ret == 0) |
| 259 | ret = i2c_smbus_write_byte_data(client, reg & 0xff, val); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg) |
| 265 | { |
| 266 | int ret; |
| 267 | |
| 268 | ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8); |
| 269 | if (ret == 0) |
| 270 | ret = i2c_smbus_read_word_data(client, reg & 0xff); |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static int synaptics_i2c_config(struct i2c_client *client) |
| 276 | { |
| 277 | int ret, control; |
| 278 | u8 int_en; |
| 279 | |
| 280 | /* set Report Rate to Device Highest (>=80) and Sleep to normal */ |
| 281 | ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1); |
| 282 | if (ret) |
| 283 | return ret; |
| 284 | |
| 285 | /* set Interrupt Disable to Func20 / Enable to Func10) */ |
| 286 | int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK; |
| 287 | ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en); |
| 288 | if (ret) |
| 289 | return ret; |
| 290 | |
| 291 | control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG); |
| 292 | /* No Deceleration */ |
| 293 | control |= no_decel ? 1 << NO_DECELERATION : 0; |
| 294 | /* Reduced Reporting */ |
| 295 | control |= reduce_report ? 1 << REDUCE_REPORTING : 0; |
| 296 | /* No Filter */ |
| 297 | control |= no_filter ? 1 << NO_FILTER : 0; |
| 298 | ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control); |
| 299 | if (ret) |
| 300 | return ret; |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static int synaptics_i2c_reset_config(struct i2c_client *client) |
| 306 | { |
| 307 | int ret; |
| 308 | |
| 309 | /* Reset the Touchpad */ |
| 310 | ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND); |
| 311 | if (ret) { |
| 312 | dev_err(&client->dev, "Unable to reset device\n"); |
| 313 | } else { |
| 314 | msleep(SOFT_RESET_DELAY_MS); |
| 315 | ret = synaptics_i2c_config(client); |
| 316 | if (ret) |
| 317 | dev_err(&client->dev, "Unable to config device\n"); |
| 318 | } |
| 319 | |
| 320 | return ret; |
| 321 | } |
| 322 | |
| 323 | static int synaptics_i2c_check_error(struct i2c_client *client) |
| 324 | { |
| 325 | int status, ret = 0; |
| 326 | |
| 327 | status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) & |
| 328 | (CONFIGURED_MSK | ERROR_MSK); |
| 329 | |
| 330 | if (status != CONFIGURED_MSK) |
| 331 | ret = synaptics_i2c_reset_config(client); |
| 332 | |
| 333 | return ret; |
| 334 | } |
| 335 | |
| 336 | static bool synaptics_i2c_get_input(struct synaptics_i2c *touch) |
| 337 | { |
| 338 | struct input_dev *input = touch->input; |
| 339 | int xy_delta, gesture; |
| 340 | s32 data; |
| 341 | s8 x_delta, y_delta; |
| 342 | |
| 343 | /* Deal with spontanious resets and errors */ |
| 344 | if (synaptics_i2c_check_error(touch->client)) |
| 345 | return 0; |
| 346 | |
| 347 | /* Get Gesture Bit */ |
| 348 | data = synaptics_i2c_reg_get(touch->client, DATA_REG0); |
| 349 | gesture = (data >> GESTURE) & 0x1; |
| 350 | |
| 351 | /* |
| 352 | * Get Relative axes. we have to get them in one shot, |
| 353 | * so we get 2 bytes starting from REL_X_REG. |
| 354 | */ |
| 355 | xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff; |
| 356 | |
| 357 | /* Separate X from Y */ |
| 358 | x_delta = xy_delta & 0xff; |
| 359 | y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff; |
| 360 | |
| 361 | /* Report the button event */ |
| 362 | input_report_key(input, BTN_LEFT, gesture); |
| 363 | |
| 364 | /* Report the deltas */ |
| 365 | input_report_rel(input, REL_X, x_delta); |
| 366 | input_report_rel(input, REL_Y, -y_delta); |
| 367 | input_sync(input); |
| 368 | |
| 369 | return xy_delta || gesture; |
| 370 | } |
| 371 | |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 372 | static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch, |
| 373 | unsigned long delay) |
| 374 | { |
| 375 | unsigned long flags; |
| 376 | |
| 377 | spin_lock_irqsave(&touch->lock, flags); |
| 378 | |
Tejun Heo | e7c2f96 | 2012-08-21 13:18:24 -0700 | [diff] [blame] | 379 | mod_delayed_work(system_wq, &touch->dwork, delay); |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 380 | |
| 381 | spin_unlock_irqrestore(&touch->lock, flags); |
| 382 | } |
| 383 | |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 384 | static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id) |
| 385 | { |
| 386 | struct synaptics_i2c *touch = dev_id; |
| 387 | |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 388 | synaptics_i2c_reschedule_work(touch, 0); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 389 | |
| 390 | return IRQ_HANDLED; |
| 391 | } |
| 392 | |
| 393 | static void synaptics_i2c_check_params(struct synaptics_i2c *touch) |
| 394 | { |
| 395 | bool reset = false; |
| 396 | |
| 397 | if (scan_rate != touch->scan_rate_param) |
| 398 | set_scan_rate(touch, scan_rate); |
| 399 | |
| 400 | if (no_decel != touch->no_decel_param) { |
| 401 | touch->no_decel_param = no_decel; |
| 402 | reset = true; |
| 403 | } |
| 404 | |
| 405 | if (no_filter != touch->no_filter_param) { |
| 406 | touch->no_filter_param = no_filter; |
| 407 | reset = true; |
| 408 | } |
| 409 | |
| 410 | if (reduce_report != touch->reduce_report_param) { |
| 411 | touch->reduce_report_param = reduce_report; |
| 412 | reset = true; |
| 413 | } |
| 414 | |
| 415 | if (reset) |
| 416 | synaptics_i2c_reset_config(touch->client); |
| 417 | } |
| 418 | |
| 419 | /* Control the Device polling rate / Work Handler sleep time */ |
Dmitry Torokhov | f5ba350 | 2009-11-02 21:57:40 -0800 | [diff] [blame] | 420 | static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch, |
| 421 | bool have_data) |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 422 | { |
| 423 | unsigned long delay, nodata_count_thres; |
| 424 | |
| 425 | if (polling_req) { |
| 426 | delay = touch->scan_ms; |
| 427 | if (have_data) { |
| 428 | touch->no_data_count = 0; |
| 429 | } else { |
| 430 | nodata_count_thres = NO_DATA_THRES / touch->scan_ms; |
| 431 | if (touch->no_data_count < nodata_count_thres) |
| 432 | touch->no_data_count++; |
| 433 | else |
| 434 | delay = NO_DATA_SLEEP_MSECS; |
| 435 | } |
| 436 | return msecs_to_jiffies(delay); |
| 437 | } else { |
| 438 | delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS); |
| 439 | return round_jiffies_relative(delay); |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | /* Work Handler */ |
| 444 | static void synaptics_i2c_work_handler(struct work_struct *work) |
| 445 | { |
| 446 | bool have_data; |
| 447 | struct synaptics_i2c *touch = |
| 448 | container_of(work, struct synaptics_i2c, dwork.work); |
| 449 | unsigned long delay; |
| 450 | |
| 451 | synaptics_i2c_check_params(touch); |
| 452 | |
| 453 | have_data = synaptics_i2c_get_input(touch); |
| 454 | delay = synaptics_i2c_adjust_delay(touch, have_data); |
| 455 | |
| 456 | /* |
| 457 | * While interrupt driven, there is no real need to poll the device. |
| 458 | * But touchpads are very sensitive, so there could be errors |
| 459 | * related to physical environment and the attention line isn't |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 460 | * necessarily asserted. In such case we can lose the touchpad. |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 461 | * We poll the device once in THREAD_IRQ_SLEEP_SECS and |
| 462 | * if error is detected, we try to reset and reconfigure the touchpad. |
| 463 | */ |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 464 | synaptics_i2c_reschedule_work(touch, delay); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | static int synaptics_i2c_open(struct input_dev *input) |
| 468 | { |
| 469 | struct synaptics_i2c *touch = input_get_drvdata(input); |
| 470 | int ret; |
| 471 | |
| 472 | ret = synaptics_i2c_reset_config(touch->client); |
| 473 | if (ret) |
| 474 | return ret; |
| 475 | |
| 476 | if (polling_req) |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 477 | synaptics_i2c_reschedule_work(touch, |
| 478 | msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static void synaptics_i2c_close(struct input_dev *input) |
| 484 | { |
| 485 | struct synaptics_i2c *touch = input_get_drvdata(input); |
| 486 | |
| 487 | if (!polling_req) |
| 488 | synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0); |
| 489 | |
| 490 | cancel_delayed_work_sync(&touch->dwork); |
| 491 | |
| 492 | /* Save some power */ |
| 493 | synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); |
| 494 | } |
| 495 | |
| 496 | static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch) |
| 497 | { |
| 498 | struct input_dev *input = touch->input; |
| 499 | |
| 500 | input->name = touch->client->name; |
| 501 | input->phys = touch->client->adapter->name; |
| 502 | input->id.bustype = BUS_I2C; |
| 503 | input->id.version = synaptics_i2c_word_get(touch->client, |
| 504 | INFO_QUERY_REG0); |
| 505 | input->dev.parent = &touch->client->dev; |
| 506 | input->open = synaptics_i2c_open; |
| 507 | input->close = synaptics_i2c_close; |
| 508 | input_set_drvdata(input, touch); |
| 509 | |
| 510 | /* Register the device as mouse */ |
| 511 | __set_bit(EV_REL, input->evbit); |
| 512 | __set_bit(REL_X, input->relbit); |
| 513 | __set_bit(REL_Y, input->relbit); |
| 514 | |
| 515 | /* Register device's buttons and keys */ |
| 516 | __set_bit(EV_KEY, input->evbit); |
| 517 | __set_bit(BTN_LEFT, input->keybit); |
| 518 | } |
| 519 | |
Dmitry Torokhov | f5ba350 | 2009-11-02 21:57:40 -0800 | [diff] [blame] | 520 | static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client) |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 521 | { |
| 522 | struct synaptics_i2c *touch; |
| 523 | |
| 524 | touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL); |
| 525 | if (!touch) |
| 526 | return NULL; |
| 527 | |
| 528 | touch->client = client; |
| 529 | touch->no_decel_param = no_decel; |
| 530 | touch->scan_rate_param = scan_rate; |
| 531 | set_scan_rate(touch, scan_rate); |
| 532 | INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler); |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 533 | spin_lock_init(&touch->lock); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 534 | |
| 535 | return touch; |
| 536 | } |
| 537 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 538 | static int synaptics_i2c_probe(struct i2c_client *client, |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 539 | const struct i2c_device_id *dev_id) |
| 540 | { |
| 541 | int ret; |
| 542 | struct synaptics_i2c *touch; |
| 543 | |
| 544 | touch = synaptics_i2c_touch_create(client); |
| 545 | if (!touch) |
| 546 | return -ENOMEM; |
| 547 | |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 548 | ret = synaptics_i2c_reset_config(client); |
| 549 | if (ret) |
| 550 | goto err_mem_free; |
| 551 | |
| 552 | if (client->irq < 1) |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 553 | polling_req = true; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 554 | |
| 555 | touch->input = input_allocate_device(); |
| 556 | if (!touch->input) { |
| 557 | ret = -ENOMEM; |
| 558 | goto err_mem_free; |
| 559 | } |
| 560 | |
| 561 | synaptics_i2c_set_input_params(touch); |
| 562 | |
| 563 | if (!polling_req) { |
| 564 | dev_dbg(&touch->client->dev, |
| 565 | "Requesting IRQ: %d\n", touch->client->irq); |
| 566 | |
| 567 | ret = request_irq(touch->client->irq, synaptics_i2c_irq, |
Yong Zhang | ec4665c | 2011-09-07 14:04:16 -0700 | [diff] [blame] | 568 | IRQ_TYPE_EDGE_FALLING, |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 569 | DRIVER_NAME, touch); |
| 570 | if (ret) { |
| 571 | dev_warn(&touch->client->dev, |
| 572 | "IRQ request failed: %d, " |
| 573 | "falling back to polling\n", ret); |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 574 | polling_req = true; |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 575 | synaptics_i2c_reg_set(touch->client, |
| 576 | INTERRUPT_EN_REG, 0); |
| 577 | } |
| 578 | } |
| 579 | |
| 580 | if (polling_req) |
| 581 | dev_dbg(&touch->client->dev, |
| 582 | "Using polling at rate: %d times/sec\n", scan_rate); |
| 583 | |
| 584 | /* Register the device in input subsystem */ |
| 585 | ret = input_register_device(touch->input); |
| 586 | if (ret) { |
| 587 | dev_err(&client->dev, |
| 588 | "Input device register failed: %d\n", ret); |
| 589 | goto err_input_free; |
| 590 | } |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 591 | |
| 592 | i2c_set_clientdata(client, touch); |
| 593 | |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 594 | return 0; |
| 595 | |
| 596 | err_input_free: |
| 597 | input_free_device(touch->input); |
| 598 | err_mem_free: |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 599 | kfree(touch); |
| 600 | |
| 601 | return ret; |
| 602 | } |
| 603 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 604 | static int synaptics_i2c_remove(struct i2c_client *client) |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 605 | { |
| 606 | struct synaptics_i2c *touch = i2c_get_clientdata(client); |
| 607 | |
| 608 | if (!polling_req) |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 609 | free_irq(client->irq, touch); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 610 | |
| 611 | input_unregister_device(touch->input); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 612 | kfree(touch); |
| 613 | |
| 614 | return 0; |
| 615 | } |
| 616 | |
Jingoo Han | 572081a | 2014-11-02 00:03:37 -0700 | [diff] [blame] | 617 | static int __maybe_unused synaptics_i2c_suspend(struct device *dev) |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 618 | { |
Mark Brown | 87b2c7d | 2011-02-11 08:53:33 -0800 | [diff] [blame] | 619 | struct i2c_client *client = to_i2c_client(dev); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 620 | struct synaptics_i2c *touch = i2c_get_clientdata(client); |
| 621 | |
| 622 | cancel_delayed_work_sync(&touch->dwork); |
| 623 | |
| 624 | /* Save some power */ |
| 625 | synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP); |
| 626 | |
| 627 | return 0; |
| 628 | } |
| 629 | |
Jingoo Han | 572081a | 2014-11-02 00:03:37 -0700 | [diff] [blame] | 630 | static int __maybe_unused synaptics_i2c_resume(struct device *dev) |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 631 | { |
| 632 | int ret; |
Mark Brown | 87b2c7d | 2011-02-11 08:53:33 -0800 | [diff] [blame] | 633 | struct i2c_client *client = to_i2c_client(dev); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 634 | struct synaptics_i2c *touch = i2c_get_clientdata(client); |
| 635 | |
| 636 | ret = synaptics_i2c_reset_config(client); |
| 637 | if (ret) |
| 638 | return ret; |
| 639 | |
Dmitry Torokhov | 30b3713 | 2009-09-16 01:06:42 -0700 | [diff] [blame] | 640 | synaptics_i2c_reschedule_work(touch, |
| 641 | msecs_to_jiffies(NO_DATA_SLEEP_MSECS)); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 642 | |
| 643 | return 0; |
| 644 | } |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 645 | |
Mark Brown | 87b2c7d | 2011-02-11 08:53:33 -0800 | [diff] [blame] | 646 | static SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend, |
| 647 | synaptics_i2c_resume); |
| 648 | |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 649 | static const struct i2c_device_id synaptics_i2c_id_table[] = { |
| 650 | { "synaptics_i2c", 0 }, |
| 651 | { }, |
| 652 | }; |
| 653 | MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table); |
| 654 | |
| 655 | static struct i2c_driver synaptics_i2c_driver = { |
| 656 | .driver = { |
| 657 | .name = DRIVER_NAME, |
| 658 | .owner = THIS_MODULE, |
Mark Brown | 87b2c7d | 2011-02-11 08:53:33 -0800 | [diff] [blame] | 659 | .pm = &synaptics_i2c_pm, |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 660 | }, |
| 661 | |
| 662 | .probe = synaptics_i2c_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 663 | .remove = synaptics_i2c_remove, |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 664 | |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 665 | .id_table = synaptics_i2c_id_table, |
| 666 | }; |
| 667 | |
Axel Lin | 1b92c1c | 2012-03-16 23:05:41 -0700 | [diff] [blame] | 668 | module_i2c_driver(synaptics_i2c_driver); |
Mike Rapoport | eef3e4c | 2009-06-11 08:08:39 -0700 | [diff] [blame] | 669 | |
| 670 | MODULE_DESCRIPTION("Synaptics I2C touchpad driver"); |
| 671 | MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab"); |
| 672 | MODULE_LICENSE("GPL"); |
| 673 | |