diff options
Diffstat (limited to 'drivers/input/touchscreen/atmel_mxt_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 170 |
1 files changed, 19 insertions, 151 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 09194721aed2..54fe190fd4bc 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -194,6 +194,8 @@ enum t100_type { /* Delay times */ #define MXT_BACKUP_TIME 50 /* msec */ +#define MXT_RESET_GPIO_TIME 20 /* msec */ +#define MXT_RESET_INVALID_CHG 100 /* msec */ #define MXT_RESET_TIME 200 /* msec */ #define MXT_RESET_TIMEOUT 3000 /* msec */ #define MXT_CRC_TIMEOUT 1000 /* msec */ @@ -1208,7 +1210,7 @@ static int mxt_soft_reset(struct mxt_data *data) return ret; /* Ignore CHG line for 100ms after reset */ - msleep(100); + msleep(MXT_RESET_INVALID_CHG); mxt_acquire_irq(data); @@ -2999,142 +3001,6 @@ static int mxt_parse_device_properties(struct mxt_data *data) return 0; } -#ifdef CONFIG_ACPI - -struct mxt_acpi_platform_data { - const char *hid; - const struct property_entry *props; -}; - -static unsigned int samus_touchpad_buttons[] = { - KEY_RESERVED, - KEY_RESERVED, - KEY_RESERVED, - BTN_LEFT -}; - -static const struct property_entry samus_touchpad_props[] = { - PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons), - { } -}; - -static struct mxt_acpi_platform_data samus_platform_data[] = { - { - /* Touchpad */ - .hid = "ATML0000", - .props = samus_touchpad_props, - }, - { - /* Touchscreen */ - .hid = "ATML0001", - }, - { } -}; - -static unsigned int chromebook_tp_buttons[] = { - KEY_RESERVED, - KEY_RESERVED, - KEY_RESERVED, - KEY_RESERVED, - KEY_RESERVED, - BTN_LEFT -}; - -static const struct property_entry chromebook_tp_props[] = { - PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_tp_buttons), - { } -}; - -static struct mxt_acpi_platform_data chromebook_platform_data[] = { - { - /* Touchpad */ - .hid = "ATML0000", - .props = chromebook_tp_props, - }, - { - /* Touchscreen */ - .hid = "ATML0001", - }, - { } -}; - -static const struct dmi_system_id mxt_dmi_table[] = { - { - /* 2015 Google Pixel */ - .ident = "Chromebook Pixel 2", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), - DMI_MATCH(DMI_PRODUCT_NAME, "Samus"), - }, - .driver_data = samus_platform_data, - }, - { - /* Samsung Chromebook Pro */ - .ident = "Samsung Chromebook Pro", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Google"), - DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"), - }, - .driver_data = samus_platform_data, - }, - { - /* Other Google Chromebooks */ - .ident = "Chromebook", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), - }, - .driver_data = chromebook_platform_data, - }, - { } -}; - -static int mxt_prepare_acpi_properties(struct i2c_client *client) -{ - struct acpi_device *adev; - const struct dmi_system_id *system_id; - const struct mxt_acpi_platform_data *acpi_pdata; - - adev = ACPI_COMPANION(&client->dev); - if (!adev) - return -ENOENT; - - system_id = dmi_first_match(mxt_dmi_table); - if (!system_id) - return -ENOENT; - - acpi_pdata = system_id->driver_data; - if (!acpi_pdata) - return -ENOENT; - - while (acpi_pdata->hid) { - if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid)) { - /* - * Remove previously installed properties if we - * are probing this device not for the very first - * time. - */ - device_remove_properties(&client->dev); - - /* - * Now install the platform-specific properties - * that are missing from ACPI. - */ - device_add_properties(&client->dev, acpi_pdata->props); - break; - } - - acpi_pdata++; - } - - return 0; -} -#else -static int mxt_prepare_acpi_properties(struct i2c_client *client) -{ - return -ENOENT; -} -#endif - static const struct dmi_system_id chromebook_T9_suspend_dmi[] = { { .matches = { @@ -3156,6 +3022,18 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) int error; /* + * Ignore devices that do not have device properties attached to + * them, as we need help determining whether we are dealing with + * touch screen or touchpad. + * + * So far on x86 the only users of Atmel touch controllers are + * Chromebooks, and chromeos_laptop driver will ensure that + * necessary properties are provided (if firmware does not do that). + */ + if (!device_property_present(&client->dev, "compatible")) + return -ENXIO; + + /* * Ignore ACPI devices representing bootloader mode. * * This is a bit of a hack: Google Chromebook BIOS creates ACPI @@ -3186,10 +3064,6 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) data->suspend_mode = dmi_check_system(chromebook_T9_suspend_dmi) ? MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP; - error = mxt_prepare_acpi_properties(client); - if (error && error != -ENOENT) - return error; - error = mxt_parse_device_properties(data); if (error) return error; @@ -3210,20 +3084,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return error; } + disable_irq(client->irq); + if (data->reset_gpio) { - data->in_bootloader = true; - msleep(MXT_RESET_TIME); - reinit_completion(&data->bl_completion); + msleep(MXT_RESET_GPIO_TIME); gpiod_set_value(data->reset_gpio, 1); - error = mxt_wait_for_completion(data, &data->bl_completion, - MXT_RESET_TIMEOUT); - if (error) - return error; - data->in_bootloader = false; + msleep(MXT_RESET_INVALID_CHG); } - disable_irq(client->irq); - error = mxt_initialize(data); if (error) return error; |