diff options
Diffstat (limited to 'drivers/input/touchscreen/edt-ft5x06.c')
| -rw-r--r-- | drivers/input/touchscreen/edt-ft5x06.c | 198 |
1 files changed, 166 insertions, 32 deletions
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index d2587724c52a..3a4f18d3450d 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -38,6 +38,9 @@ #define WORK_REGISTER_NUM_X 0x33 #define WORK_REGISTER_NUM_Y 0x34 +#define PMOD_REGISTER_ACTIVE 0x00 +#define PMOD_REGISTER_HIBERNATE 0x03 + #define M09_REGISTER_THRESHOLD 0x80 #define M09_REGISTER_GAIN 0x92 #define M09_REGISTER_OFFSET 0x93 @@ -53,6 +56,7 @@ #define WORK_REGISTER_OPMODE 0x3c #define FACTORY_REGISTER_OPMODE 0x01 +#define PMOD_REGISTER_OPMODE 0xa5 #define TOUCH_EVENT_DOWN 0x00 #define TOUCH_EVENT_UP 0x01 @@ -65,6 +69,12 @@ #define EDT_RAW_DATA_RETRIES 100 #define EDT_RAW_DATA_DELAY 1000 /* usec */ +enum edt_pmode { + EDT_PMODE_NOT_SUPPORTED, + EDT_PMODE_HIBERNATE, + EDT_PMODE_POWEROFF, +}; + enum edt_ver { EDT_M06, EDT_M09, @@ -103,6 +113,7 @@ struct edt_ft5x06_ts_data { struct mutex mutex; bool factory_mode; + enum edt_pmode suspend_mode; int threshold; int gain; int offset; @@ -527,6 +538,29 @@ static const struct attribute_group edt_ft5x06_attr_group = { .attrs = edt_ft5x06_attrs, }; +static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata) +{ + struct edt_reg_addr *reg_addr = &tsdata->reg_addr; + + edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, + tsdata->threshold); + edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, + tsdata->gain); + if (reg_addr->reg_offset != NO_REGISTER) + edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, + tsdata->offset); + if (reg_addr->reg_offset_x != NO_REGISTER) + edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, + tsdata->offset_x); + if (reg_addr->reg_offset_y != NO_REGISTER) + edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, + tsdata->offset_y); + if (reg_addr->reg_report_rate != NO_REGISTER) + edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate, + tsdata->report_rate); + +} + #ifdef CONFIG_DEBUG_FS static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata) { @@ -592,7 +626,6 @@ static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata) { struct i2c_client *client = tsdata->client; int retries = EDT_SWITCH_MODE_RETRIES; - struct edt_reg_addr *reg_addr = &tsdata->reg_addr; int ret; int error; @@ -624,24 +657,7 @@ static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata) kfree(tsdata->raw_buffer); tsdata->raw_buffer = NULL; - /* restore parameters */ - edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, - tsdata->threshold); - edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, - tsdata->gain); - if (reg_addr->reg_offset != NO_REGISTER) - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, - tsdata->offset); - if (reg_addr->reg_offset_x != NO_REGISTER) - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, - tsdata->offset_x); - if (reg_addr->reg_offset_y != NO_REGISTER) - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, - tsdata->offset_y); - if (reg_addr->reg_report_rate != NO_REGISTER) - edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate, - tsdata->report_rate); - + edt_ft5x06_restore_reg_parameters(tsdata); enable_irq(client->irq); return 0; @@ -762,9 +778,8 @@ static const struct file_operations debugfs_raw_data_fops = { .read = edt_ft5x06_debugfs_raw_data_read, }; -static void -edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, - const char *debugfs_name) +static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, + const char *debugfs_name) { tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL); @@ -777,8 +792,7 @@ edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, tsdata->debug_dir, tsdata, &debugfs_raw_data_fops); } -static void -edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) +static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) { debugfs_remove_recursive(tsdata->debug_dir); kfree(tsdata->raw_buffer); @@ -786,14 +800,17 @@ edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) #else -static inline void -edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, - const char *debugfs_name) +static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata) +{ + return -ENOSYS; +} + +static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, + const char *debugfs_name) { } -static inline void -edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) +static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) { } @@ -938,19 +955,25 @@ static void edt_ft5x06_ts_get_defaults(struct device *dev, error = device_property_read_u32(dev, "offset", &val); if (!error) { - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, val); + if (reg_addr->reg_offset != NO_REGISTER) + edt_ft5x06_register_write(tsdata, + reg_addr->reg_offset, val); tsdata->offset = val; } error = device_property_read_u32(dev, "offset-x", &val); if (!error) { - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, val); + if (reg_addr->reg_offset_x != NO_REGISTER) + edt_ft5x06_register_write(tsdata, + reg_addr->reg_offset_x, val); tsdata->offset_x = val; } error = device_property_read_u32(dev, "offset-y", &val); if (!error) { - edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, val); + if (reg_addr->reg_offset_y != NO_REGISTER) + edt_ft5x06_register_write(tsdata, + reg_addr->reg_offset_y, val); tsdata->offset_y = val; } } @@ -1114,6 +1137,19 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, return error; } + /* + * Check which sleep modes we can support. Power-off requieres the + * reset-pin to ensure correct power-down/power-up behaviour. Start with + * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep + * mode. + */ + if (tsdata->reset_gpio) + tsdata->suspend_mode = EDT_PMODE_POWEROFF; + else if (tsdata->wake_gpio) + tsdata->suspend_mode = EDT_PMODE_HIBERNATE; + else + tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED; + if (tsdata->wake_gpio) { usleep_range(5000, 6000); gpiod_set_value_cansleep(tsdata->wake_gpio, 1); @@ -1227,6 +1263,102 @@ static int edt_ft5x06_ts_remove(struct i2c_client *client) return 0; } +static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); + struct gpio_desc *reset_gpio = tsdata->reset_gpio; + int ret; + + if (device_may_wakeup(dev)) + return 0; + + if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED) + return 0; + + /* Enter hibernate mode. */ + ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE, + PMOD_REGISTER_HIBERNATE); + if (ret) + dev_warn(dev, "Failed to set hibernate mode\n"); + + if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE) + return 0; + + /* + * Power-off according the datasheet. Cut the power may leaf the irq + * line in an undefined state depending on the host pull resistor + * settings. Disable the irq to avoid adjusting each host till the + * device is back in a full functional state. + */ + disable_irq(tsdata->client->irq); + + gpiod_set_value_cansleep(reset_gpio, 1); + usleep_range(1000, 2000); + + ret = regulator_disable(tsdata->vcc); + if (ret) + dev_warn(dev, "Failed to disable vcc\n"); + + return 0; +} + +static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); + int ret = 0; + + if (device_may_wakeup(dev)) + return 0; + + if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED) + return 0; + + if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) { + struct gpio_desc *reset_gpio = tsdata->reset_gpio; + + /* + * We can't check if the regulator is a dummy or a real + * regulator. So we need to specify the 5ms reset time (T_rst) + * here instead of the 100us T_rtp time. We also need to wait + * 300ms in case it was a real supply and the power was cutted + * of. Toggle the reset pin is also a way to exit the hibernate + * mode. + */ + gpiod_set_value_cansleep(reset_gpio, 1); + usleep_range(5000, 6000); + + ret = regulator_enable(tsdata->vcc); + if (ret) { + dev_err(dev, "Failed to enable vcc\n"); + return ret; + } + + usleep_range(1000, 2000); + gpiod_set_value_cansleep(reset_gpio, 0); + msleep(300); + + edt_ft5x06_restore_reg_parameters(tsdata); + enable_irq(tsdata->client->irq); + + if (tsdata->factory_mode) + ret = edt_ft5x06_factory_mode(tsdata); + } else { + struct gpio_desc *wake_gpio = tsdata->wake_gpio; + + gpiod_set_value_cansleep(wake_gpio, 0); + usleep_range(5000, 6000); + gpiod_set_value_cansleep(wake_gpio, 1); + } + + + return ret; +} + +static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops, + edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume); + static const struct edt_i2c_chip_data edt_ft5x06_data = { .max_support_points = 5, }; @@ -1265,6 +1397,8 @@ static struct i2c_driver edt_ft5x06_ts_driver = { .driver = { .name = "edt_ft5x06", .of_match_table = edt_ft5x06_of_match, + .pm = &edt_ft5x06_ts_pm_ops, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, .id_table = edt_ft5x06_ts_id, .probe = edt_ft5x06_ts_probe, |