It is possible to bring the device into a deep sleep state. To exit this state the reset or wakeup pin must be toggeled as documented in [1]. Because of the poor documentation I used the several downstream kernels [2] and other applications notes [3] to indentify the related registers. [1] https://www.newhavendisplay.com/appnotes/datasheets/touchpanel/ \ FT5x26.pdf [2] https://github.com/linux-sunxi/linux-sunxi/blob/sunxi-3.4/drivers/ \ input/touchscreen/ft5x_ts.c https://github.com/Pablito2020/focaltech-touch-driver/blob/master/ \ ft5336_driver.c [3] https://www.newhavendisplay.com/appnotes/datasheets/touchpanel/ \ FT5x16_registers.pdf Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx> --- drivers/input/touchscreen/edt-ft5x06.c | 42 ++++++++++++++++++++++++-- 1 file changed, 39 insertions(+), 3 deletions(-) diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index aafb6f4e34d7..b95ce5a7482d 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -37,6 +37,9 @@ #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 @@ -52,6 +55,7 @@ #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 @@ -1204,19 +1208,51 @@ static int edt_ft5x06_ts_remove(struct i2c_client *client) 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); + int ret; - if (device_may_wakeup(dev)) + if (device_may_wakeup(dev)) { enable_irq_wake(client->irq); + return 0; + } - return 0; + /* + * Hibernate mode requires reset or wake signal to recover to active + * state. + */ + if (!tsdata->wake_gpio && !tsdata->reset_gpio) + return 0; + + ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE, + PMOD_REGISTER_HIBERNATE); + if (ret) + dev_err(dev, "Failed to set hibernate mode\n"); + + return ret; } 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); - if (device_may_wakeup(dev)) + if (device_may_wakeup(dev)) { disable_irq_wake(client->irq); + return 0; + } + + /* Recover from hibernate mode if hardware supports it */ + if (tsdata->wake_gpio) { + gpiod_set_value_cansleep(tsdata->wake_gpio, 0); + usleep_range(5000, 6000); + gpiod_set_value_cansleep(tsdata->wake_gpio, 1); + msleep(300); + } else if (tsdata->reset_gpio) { + gpiod_set_value_cansleep(tsdata->reset_gpio, 1); + usleep_range(5000, 6000); + gpiod_set_value_cansleep(tsdata->reset_gpio, 0); + msleep(300); + } return 0; } -- 2.20.1
