input/mouse/synaptics_i2c.c

0001 /*
0002  * Synaptics touchpad with I2C interface
0003  *
0004  * Copyright (C) 2009 Compulab, Ltd.
0005  * Mike Rapoport <mike@compulab.co.il>
0006  * Igor Grinberg <grinberg@compulab.co.il>
0007  *
0008  * This file is subject to the terms and conditions of the GNU General Public
0009  * License.  See the file COPYING in the main directory of this archive for
0010  * more details.
0011  */
0012
0013 #include <linux/module.h>
0014 #include <linux/i2c.h>
0015 #include <linux/irq.h>
0016 #include <linux/interrupt.h>
0017 #include <linux/input.h>
0018 #include <linux/delay.h>
0019 #include <linux/workqueue.h>
0020 #include <linux/slab.h>
0021 #include <linux/pm.h>
0022
0023 #define DRIVER_NAME     "synaptics_i2c"
0024 /* maximum product id is 15 characters */
0025 #define PRODUCT_ID_LENGTH   15
0026 #define REGISTER_LENGTH     8
0027
0028 /*
0029  * after soft reset, we should wait for 1 ms
0030  * before the device becomes operational
0031  */
0032 #define SOFT_RESET_DELAY_US 3000
0033 /* and after hard reset, we should wait for max 500ms */
0034 #define HARD_RESET_DELAY_MS 500
0035
0036 /* Registers by SMBus address */
0037 #define PAGE_SEL_REG        0xff
0038 #define DEVICE_STATUS_REG   0x09
0039
0040 /* Registers by RMI address */
0041 #define DEV_CONTROL_REG     0x0000
0042 #define INTERRUPT_EN_REG    0x0001
0043 #define ERR_STAT_REG        0x0002
0044 #define INT_REQ_STAT_REG    0x0003
0045 #define DEV_COMMAND_REG     0x0004
0046
0047 #define RMI_PROT_VER_REG    0x0200
0048 #define MANUFACT_ID_REG     0x0201
0049 #define PHYS_INT_VER_REG    0x0202
0050 #define PROD_PROPERTY_REG   0x0203
0051 #define INFO_QUERY_REG0     0x0204
0052 #define INFO_QUERY_REG1     (INFO_QUERY_REG0 + 1)
0053 #define INFO_QUERY_REG2     (INFO_QUERY_REG0 + 2)
0054 #define INFO_QUERY_REG3     (INFO_QUERY_REG0 + 3)
0055
0056 #define PRODUCT_ID_REG0     0x0210
0057 #define PRODUCT_ID_REG1     (PRODUCT_ID_REG0 + 1)
0058 #define PRODUCT_ID_REG2     (PRODUCT_ID_REG0 + 2)
0059 #define PRODUCT_ID_REG3     (PRODUCT_ID_REG0 + 3)
0060 #define PRODUCT_ID_REG4     (PRODUCT_ID_REG0 + 4)
0061 #define PRODUCT_ID_REG5     (PRODUCT_ID_REG0 + 5)
0062 #define PRODUCT_ID_REG6     (PRODUCT_ID_REG0 + 6)
0063 #define PRODUCT_ID_REG7     (PRODUCT_ID_REG0 + 7)
0064 #define PRODUCT_ID_REG8     (PRODUCT_ID_REG0 + 8)
0065 #define PRODUCT_ID_REG9     (PRODUCT_ID_REG0 + 9)
0066 #define PRODUCT_ID_REG10    (PRODUCT_ID_REG0 + 10)
0067 #define PRODUCT_ID_REG11    (PRODUCT_ID_REG0 + 11)
0068 #define PRODUCT_ID_REG12    (PRODUCT_ID_REG0 + 12)
0069 #define PRODUCT_ID_REG13    (PRODUCT_ID_REG0 + 13)
0070 #define PRODUCT_ID_REG14    (PRODUCT_ID_REG0 + 14)
0071 #define PRODUCT_ID_REG15    (PRODUCT_ID_REG0 + 15)
0072
0073 #define DATA_REG0       0x0400
0074 #define ABS_PRESSURE_REG    0x0401
0075 #define ABS_MSB_X_REG       0x0402
0076 #define ABS_LSB_X_REG       (ABS_MSB_X_REG + 1)
0077 #define ABS_MSB_Y_REG       0x0404
0078 #define ABS_LSB_Y_REG       (ABS_MSB_Y_REG + 1)
0079 #define REL_X_REG       0x0406
0080 #define REL_Y_REG       0x0407
0081
0082 #define DEV_QUERY_REG0      0x1000
0083 #define DEV_QUERY_REG1      (DEV_QUERY_REG0 + 1)
0084 #define DEV_QUERY_REG2      (DEV_QUERY_REG0 + 2)
0085 #define DEV_QUERY_REG3      (DEV_QUERY_REG0 + 3)
0086 #define DEV_QUERY_REG4      (DEV_QUERY_REG0 + 4)
0087 #define DEV_QUERY_REG5      (DEV_QUERY_REG0 + 5)
0088 #define DEV_QUERY_REG6      (DEV_QUERY_REG0 + 6)
0089 #define DEV_QUERY_REG7      (DEV_QUERY_REG0 + 7)
0090 #define DEV_QUERY_REG8      (DEV_QUERY_REG0 + 8)
0091
0092 #define GENERAL_2D_CONTROL_REG  0x1041
0093 #define SENSOR_SENSITIVITY_REG  0x1044
0094 #define SENS_MAX_POS_MSB_REG    0x1046
0095 #define SENS_MAX_POS_LSB_REG    (SENS_MAX_POS_UPPER_REG + 1)
0096
0097 /* Register bits */
0098 /* Device Control Register Bits */
0099 #define REPORT_RATE_1ST_BIT 6
0100
0101 /* Interrupt Enable Register Bits (INTERRUPT_EN_REG) */
0102 #define F10_ABS_INT_ENA     0
0103 #define F10_REL_INT_ENA     1
0104 #define F20_INT_ENA     2
0105
0106 /* Interrupt Request Register Bits (INT_REQ_STAT_REG | DEVICE_STATUS_REG) */
0107 #define F10_ABS_INT_REQ     0
0108 #define F10_REL_INT_REQ     1
0109 #define F20_INT_REQ     2
0110 /* Device Status Register Bits (DEVICE_STATUS_REG) */
0111 #define STAT_CONFIGURED     6
0112 #define STAT_ERROR      7
0113
0114 /* Device Command Register Bits (DEV_COMMAND_REG) */
0115 #define RESET_COMMAND       0x01
0116 #define REZERO_COMMAND      0x02
0117
0118 /* Data Register 0 Bits (DATA_REG0) */
0119 #define GESTURE         3
0120
0121 /* Device Query Registers Bits */
0122 /* DEV_QUERY_REG3 */
0123 #define HAS_PALM_DETECT     1
0124 #define HAS_MULTI_FING      2
0125 #define HAS_SCROLLER        4
0126 #define HAS_2D_SCROLL       5
0127
0128 /* General 2D Control Register Bits (GENERAL_2D_CONTROL_REG) */
0129 #define NO_DECELERATION     1
0130 #define REDUCE_REPORTING    3
0131 #define NO_FILTER       5
0132
0133 /* Function Masks */
0134 /* Device Control Register Masks (DEV_CONTROL_REG) */
0135 #define REPORT_RATE_MSK     0xc0
0136 #define SLEEP_MODE_MSK      0x07
0137
0138 /* Device Sleep Modes */
0139 #define FULL_AWAKE      0x0
0140 #define NORMAL_OP       0x1
0141 #define LOW_PWR_OP      0x2
0142 #define VERY_LOW_PWR_OP     0x3
0143 #define SENS_SLEEP      0x4
0144 #define SLEEP_MOD       0x5
0145 #define DEEP_SLEEP      0x6
0146 #define HIBERNATE       0x7
0147
0148 /* Interrupt Register Mask */
0149 /* (INT_REQ_STAT_REG | DEVICE_STATUS_REG | INTERRUPT_EN_REG) */
0150 #define INT_ENA_REQ_MSK     0x07
0151 #define INT_ENA_ABS_MSK     0x01
0152 #define INT_ENA_REL_MSK     0x02
0153 #define INT_ENA_F20_MSK     0x04
0154
0155 /* Device Status Register Masks (DEVICE_STATUS_REG) */
0156 #define CONFIGURED_MSK      0x40
0157 #define ERROR_MSK       0x80
0158
0159 /* Data Register 0 Masks */
0160 #define FINGER_WIDTH_MSK    0xf0
0161 #define GESTURE_MSK     0x08
0162 #define SENSOR_STATUS_MSK   0x07
0163
0164 /*
0165  * MSB Position Register Masks
0166  * ABS_MSB_X_REG | ABS_MSB_Y_REG | SENS_MAX_POS_MSB_REG |
0167  * DEV_QUERY_REG3 | DEV_QUERY_REG5
0168  */
0169 #define MSB_POSITION_MSK    0x1f
0170
0171 /* Device Query Registers Masks */
0172
0173 /* DEV_QUERY_REG2 */
0174 #define NUM_EXTRA_POS_MSK   0x07
0175
0176 /* When in IRQ mode read the device every THREAD_IRQ_SLEEP_SECS */
0177 #define THREAD_IRQ_SLEEP_SECS   2
0178 #define THREAD_IRQ_SLEEP_MSECS  (THREAD_IRQ_SLEEP_SECS * MSEC_PER_SEC)
0179
0180 /*
0181  * When in Polling mode and no data received for NO_DATA_THRES msecs
0182  * reduce the polling rate to NO_DATA_SLEEP_MSECS
0183  */
0184 #define NO_DATA_THRES       (MSEC_PER_SEC)
0185 #define NO_DATA_SLEEP_MSECS (MSEC_PER_SEC / 4)
0186
0187 /* Control touchpad's No Deceleration option */
0188 static bool no_decel = true;
0189 module_param(no_decel, bool, 0644);
0190 MODULE_PARM_DESC(no_decel, "No Deceleration. Default = 1 (on)");
0191
0192 /* Control touchpad's Reduced Reporting option */
0193 static bool reduce_report;
0194 module_param(reduce_report, bool, 0644);
0195 MODULE_PARM_DESC(reduce_report, "Reduced Reporting. Default = 0 (off)");
0196
0197 /* Control touchpad's No Filter option */
0198 static bool no_filter;
0199 module_param(no_filter, bool, 0644);
0200 MODULE_PARM_DESC(no_filter, "No Filter. Default = 0 (off)");
0201
0202 /*
0203  * touchpad Attention line is Active Low and Open Drain,
0204  * therefore should be connected to pulled up line
0205  * and the irq configuration should be set to Falling Edge Trigger
0206  */
0207 /* Control IRQ / Polling option */
0208 static bool polling_req;
0209 module_param(polling_req, bool, 0444);
0210 MODULE_PARM_DESC(polling_req, "Request Polling. Default = 0 (use irq)");
0211
0212 /* Control Polling Rate */
0213 static int scan_rate = 80;
0214 module_param(scan_rate, int, 0644);
0215 MODULE_PARM_DESC(scan_rate, "Polling rate in times/sec. Default = 80");
0216
0217 /* The main device structure */
0218 struct synaptics_i2c {
0219     struct i2c_client   *client;
0220     struct input_dev    *input;
0221     struct delayed_work dwork;
0222     int         no_data_count;
0223     int         no_decel_param;
0224     int         reduce_report_param;
0225     int         no_filter_param;
0226     int         scan_rate_param;
0227     int         scan_ms;
0228 };
0229
0230 static inline void set_scan_rate(struct synaptics_i2c *touch, int scan_rate)
0231 {
0232     touch->scan_ms = MSEC_PER_SEC / scan_rate;
0233     touch->scan_rate_param = scan_rate;
0234 }
0235
0236 /*
0237  * Driver's initial design makes no race condition possible on i2c bus,
0238  * so there is no need in any locking.
0239  * Keep it in mind, while playing with the code.
0240  */
0241 static s32 synaptics_i2c_reg_get(struct i2c_client *client, u16 reg)
0242 {
0243     int ret;
0244
0245     ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
0246     if (ret == 0)
0247         ret = i2c_smbus_read_byte_data(client, reg & 0xff);
0248
0249     return ret;
0250 }
0251
0252 static s32 synaptics_i2c_reg_set(struct i2c_client *client, u16 reg, u8 val)
0253 {
0254     int ret;
0255
0256     ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
0257     if (ret == 0)
0258         ret = i2c_smbus_write_byte_data(client, reg & 0xff, val);
0259
0260     return ret;
0261 }
0262
0263 static s32 synaptics_i2c_word_get(struct i2c_client *client, u16 reg)
0264 {
0265     int ret;
0266
0267     ret = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
0268     if (ret == 0)
0269         ret = i2c_smbus_read_word_data(client, reg & 0xff);
0270
0271     return ret;
0272 }
0273
0274 static int synaptics_i2c_config(struct i2c_client *client)
0275 {
0276     int ret, control;
0277     u8 int_en;
0278
0279     /* set Report Rate to Device Highest (>=80) and Sleep to normal */
0280     ret = synaptics_i2c_reg_set(client, DEV_CONTROL_REG, 0xc1);
0281     if (ret)
0282         return ret;
0283
0284     /* set Interrupt Disable to Func20 / Enable to Func10) */
0285     int_en = (polling_req) ? 0 : INT_ENA_ABS_MSK | INT_ENA_REL_MSK;
0286     ret = synaptics_i2c_reg_set(client, INTERRUPT_EN_REG, int_en);
0287     if (ret)
0288         return ret;
0289
0290     control = synaptics_i2c_reg_get(client, GENERAL_2D_CONTROL_REG);
0291     /* No Deceleration */
0292     control |= no_decel ? 1 << NO_DECELERATION : 0;
0293     /* Reduced Reporting */
0294     control |= reduce_report ? 1 << REDUCE_REPORTING : 0;
0295     /* No Filter */
0296     control |= no_filter ? 1 << NO_FILTER : 0;
0297     ret = synaptics_i2c_reg_set(client, GENERAL_2D_CONTROL_REG, control);
0298     if (ret)
0299         return ret;
0300
0301     return 0;
0302 }
0303
0304 static int synaptics_i2c_reset_config(struct i2c_client *client)
0305 {
0306     int ret;
0307
0308     /* Reset the Touchpad */
0309     ret = synaptics_i2c_reg_set(client, DEV_COMMAND_REG, RESET_COMMAND);
0310     if (ret) {
0311         dev_err(&client->dev, "Unable to reset device\n");
0312     } else {
0313         usleep_range(SOFT_RESET_DELAY_US, SOFT_RESET_DELAY_US + 100);
0314         ret = synaptics_i2c_config(client);
0315         if (ret)
0316             dev_err(&client->dev, "Unable to config device\n");
0317     }
0318
0319     return ret;
0320 }
0321
0322 static int synaptics_i2c_check_error(struct i2c_client *client)
0323 {
0324     int status, ret = 0;
0325
0326     status = i2c_smbus_read_byte_data(client, DEVICE_STATUS_REG) &
0327         (CONFIGURED_MSK | ERROR_MSK);
0328
0329     if (status != CONFIGURED_MSK)
0330         ret = synaptics_i2c_reset_config(client);
0331
0332     return ret;
0333 }
0334
0335 static bool synaptics_i2c_get_input(struct synaptics_i2c *touch)
0336 {
0337     struct input_dev *input = touch->input;
0338     int xy_delta, gesture;
0339     s32 data;
0340     s8 x_delta, y_delta;
0341
0342     /* Deal with spontaneous resets and errors */
0343     if (synaptics_i2c_check_error(touch->client))
0344         return false;
0345
0346     /* Get Gesture Bit */
0347     data = synaptics_i2c_reg_get(touch->client, DATA_REG0);
0348     gesture = (data >> GESTURE) & 0x1;
0349
0350     /*
0351      * Get Relative axes. we have to get them in one shot,
0352      * so we get 2 bytes starting from REL_X_REG.
0353      */
0354     xy_delta = synaptics_i2c_word_get(touch->client, REL_X_REG) & 0xffff;
0355
0356     /* Separate X from Y */
0357     x_delta = xy_delta & 0xff;
0358     y_delta = (xy_delta >> REGISTER_LENGTH) & 0xff;
0359
0360     /* Report the button event */
0361     input_report_key(input, BTN_LEFT, gesture);
0362
0363     /* Report the deltas */
0364     input_report_rel(input, REL_X, x_delta);
0365     input_report_rel(input, REL_Y, -y_delta);
0366     input_sync(input);
0367
0368     return xy_delta || gesture;
0369 }
0370
0371 static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
0372 {
0373     struct synaptics_i2c *touch = dev_id;
0374
0375     mod_delayed_work(system_wq, &touch->dwork, 0);
0376
0377     return IRQ_HANDLED;
0378 }
0379
0380 static void synaptics_i2c_check_params(struct synaptics_i2c *touch)
0381 {
0382     bool reset = false;
0383
0384     if (scan_rate != touch->scan_rate_param)
0385         set_scan_rate(touch, scan_rate);
0386
0387     if (no_decel != touch->no_decel_param) {
0388         touch->no_decel_param = no_decel;
0389         reset = true;
0390     }
0391
0392     if (no_filter != touch->no_filter_param) {
0393         touch->no_filter_param = no_filter;
0394         reset = true;
0395     }
0396
0397     if (reduce_report != touch->reduce_report_param) {
0398         touch->reduce_report_param = reduce_report;
0399         reset = true;
0400     }
0401
0402     if (reset)
0403         synaptics_i2c_reset_config(touch->client);
0404 }
0405
0406 /* Control the Device polling rate / Work Handler sleep time */
0407 static unsigned long synaptics_i2c_adjust_delay(struct synaptics_i2c *touch,
0408                         bool have_data)
0409 {
0410     unsigned long delay, nodata_count_thres;
0411
0412     if (polling_req) {
0413         delay = touch->scan_ms;
0414         if (have_data) {
0415             touch->no_data_count = 0;
0416         } else {
0417             nodata_count_thres = NO_DATA_THRES / touch->scan_ms;
0418             if (touch->no_data_count < nodata_count_thres)
0419                 touch->no_data_count++;
0420             else
0421                 delay = NO_DATA_SLEEP_MSECS;
0422         }
0423         return msecs_to_jiffies(delay);
0424     } else {
0425         delay = msecs_to_jiffies(THREAD_IRQ_SLEEP_MSECS);
0426         return round_jiffies_relative(delay);
0427     }
0428 }
0429
0430 /* Work Handler */
0431 static void synaptics_i2c_work_handler(struct work_struct *work)
0432 {
0433     bool have_data;
0434     struct synaptics_i2c *touch =
0435             container_of(work, struct synaptics_i2c, dwork.work);
0436     unsigned long delay;
0437
0438     synaptics_i2c_check_params(touch);
0439
0440     have_data = synaptics_i2c_get_input(touch);
0441     delay = synaptics_i2c_adjust_delay(touch, have_data);
0442
0443     /*
0444      * While interrupt driven, there is no real need to poll the device.
0445      * But touchpads are very sensitive, so there could be errors
0446      * related to physical environment and the attention line isn't
0447      * necessarily asserted. In such case we can lose the touchpad.
0448      * We poll the device once in THREAD_IRQ_SLEEP_SECS and
0449      * if error is detected, we try to reset and reconfigure the touchpad.
0450      */
0451     mod_delayed_work(system_wq, &touch->dwork, delay);
0452 }
0453
0454 static int synaptics_i2c_open(struct input_dev *input)
0455 {
0456     struct synaptics_i2c *touch = input_get_drvdata(input);
0457     int ret;
0458
0459     ret = synaptics_i2c_reset_config(touch->client);
0460     if (ret)
0461         return ret;
0462
0463     if (polling_req)
0464         mod_delayed_work(system_wq, &touch->dwork,
0465                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
0466
0467     return 0;
0468 }
0469
0470 static void synaptics_i2c_close(struct input_dev *input)
0471 {
0472     struct synaptics_i2c *touch = input_get_drvdata(input);
0473
0474     if (!polling_req)
0475         synaptics_i2c_reg_set(touch->client, INTERRUPT_EN_REG, 0);
0476
0477     cancel_delayed_work_sync(&touch->dwork);
0478
0479     /* Save some power */
0480     synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
0481 }
0482
0483 static void synaptics_i2c_set_input_params(struct synaptics_i2c *touch)
0484 {
0485     struct input_dev *input = touch->input;
0486
0487     input->name = touch->client->name;
0488     input->phys = touch->client->adapter->name;
0489     input->id.bustype = BUS_I2C;
0490     input->id.version = synaptics_i2c_word_get(touch->client,
0491                            INFO_QUERY_REG0);
0492     input->dev.parent = &touch->client->dev;
0493     input->open = synaptics_i2c_open;
0494     input->close = synaptics_i2c_close;
0495     input_set_drvdata(input, touch);
0496
0497     /* Register the device as mouse */
0498     __set_bit(EV_REL, input->evbit);
0499     __set_bit(REL_X, input->relbit);
0500     __set_bit(REL_Y, input->relbit);
0501
0502     /* Register device's buttons and keys */
0503     __set_bit(EV_KEY, input->evbit);
0504     __set_bit(BTN_LEFT, input->keybit);
0505 }
0506
0507 static struct synaptics_i2c *synaptics_i2c_touch_create(struct i2c_client *client)
0508 {
0509     struct synaptics_i2c *touch;
0510
0511     touch = kzalloc(sizeof(struct synaptics_i2c), GFP_KERNEL);
0512     if (!touch)
0513         return NULL;
0514
0515     touch->client = client;
0516     touch->no_decel_param = no_decel;
0517     touch->scan_rate_param = scan_rate;
0518     set_scan_rate(touch, scan_rate);
0519     INIT_DELAYED_WORK(&touch->dwork, synaptics_i2c_work_handler);
0520
0521     return touch;
0522 }
0523
0524 static int synaptics_i2c_probe(struct i2c_client *client,
0525                    const struct i2c_device_id *dev_id)
0526 {
0527     int ret;
0528     struct synaptics_i2c *touch;
0529
0530     touch = synaptics_i2c_touch_create(client);
0531     if (!touch)
0532         return -ENOMEM;
0533
0534     ret = synaptics_i2c_reset_config(client);
0535     if (ret)
0536         goto err_mem_free;
0537
0538     if (client->irq < 1)
0539         polling_req = true;
0540
0541     touch->input = input_allocate_device();
0542     if (!touch->input) {
0543         ret = -ENOMEM;
0544         goto err_mem_free;
0545     }
0546
0547     synaptics_i2c_set_input_params(touch);
0548
0549     if (!polling_req) {
0550         dev_dbg(&touch->client->dev,
0551              "Requesting IRQ: %d\n", touch->client->irq);
0552
0553         ret = request_irq(touch->client->irq, synaptics_i2c_irq,
0554                   IRQ_TYPE_EDGE_FALLING,
0555                   DRIVER_NAME, touch);
0556         if (ret) {
0557             dev_warn(&touch->client->dev,
0558                   "IRQ request failed: %d, "
0559                   "falling back to polling\n", ret);
0560             polling_req = true;
0561             synaptics_i2c_reg_set(touch->client,
0562                           INTERRUPT_EN_REG, 0);
0563         }
0564     }
0565
0566     if (polling_req)
0567         dev_dbg(&touch->client->dev,
0568              "Using polling at rate: %d times/sec\n", scan_rate);
0569
0570     /* Register the device in input subsystem */
0571     ret = input_register_device(touch->input);
0572     if (ret) {
0573         dev_err(&client->dev,
0574              "Input device register failed: %d\n", ret);
0575         goto err_input_free;
0576     }
0577
0578     i2c_set_clientdata(client, touch);
0579
0580     return 0;
0581
0582 err_input_free:
0583     input_free_device(touch->input);
0584 err_mem_free:
0585     kfree(touch);
0586
0587     return ret;
0588 }
0589
0590 static int synaptics_i2c_remove(struct i2c_client *client)
0591 {
0592     struct synaptics_i2c *touch = i2c_get_clientdata(client);
0593
0594     if (!polling_req)
0595         free_irq(client->irq, touch);
0596
0597     input_unregister_device(touch->input);
0598     kfree(touch);
0599
0600     return 0;
0601 }
0602
0603 static int __maybe_unused synaptics_i2c_suspend(struct device *dev)
0604 {
0605     struct i2c_client *client = to_i2c_client(dev);
0606     struct synaptics_i2c *touch = i2c_get_clientdata(client);
0607
0608     cancel_delayed_work_sync(&touch->dwork);
0609
0610     /* Save some power */
0611     synaptics_i2c_reg_set(touch->client, DEV_CONTROL_REG, DEEP_SLEEP);
0612
0613     return 0;
0614 }
0615
0616 static int __maybe_unused synaptics_i2c_resume(struct device *dev)
0617 {
0618     int ret;
0619     struct i2c_client *client = to_i2c_client(dev);
0620     struct synaptics_i2c *touch = i2c_get_clientdata(client);
0621
0622     ret = synaptics_i2c_reset_config(client);
0623     if (ret)
0624         return ret;
0625
0626     mod_delayed_work(system_wq, &touch->dwork,
0627                 msecs_to_jiffies(NO_DATA_SLEEP_MSECS));
0628
0629     return 0;
0630 }
0631
0632 static SIMPLE_DEV_PM_OPS(synaptics_i2c_pm, synaptics_i2c_suspend,
0633              synaptics_i2c_resume);
0634
0635 static const struct i2c_device_id synaptics_i2c_id_table[] = {
0636     { "synaptics_i2c", 0 },
0637     { },
0638 };
0639 MODULE_DEVICE_TABLE(i2c, synaptics_i2c_id_table);
0640
0641 #ifdef CONFIG_OF
0642 static const struct of_device_id synaptics_i2c_of_match[] = {
0643     { .compatible = "synaptics,synaptics_i2c", },
0644     { },
0645 };
0646 MODULE_DEVICE_TABLE(of, synaptics_i2c_of_match);
0647 #endif
0648
0649 static struct i2c_driver synaptics_i2c_driver = {
0650     .driver = {
0651         .name   = DRIVER_NAME,
0652         .of_match_table = of_match_ptr(synaptics_i2c_of_match),
0653         .pm = &synaptics_i2c_pm,
0654     },
0655
0656     .probe      = synaptics_i2c_probe,
0657     .remove     = synaptics_i2c_remove,
0658
0659     .id_table   = synaptics_i2c_id_table,
0660 };
0661
0662 module_i2c_driver(synaptics_i2c_driver);
0663
0664 MODULE_DESCRIPTION("Synaptics I2C touchpad driver");
0665 MODULE_AUTHOR("Mike Rapoport, Igor Grinberg, Compulab");
0666 MODULE_LICENSE("GPL");
0667