diff options
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 141 |
1 files changed, 130 insertions, 11 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 2875ddf..40b98dd 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -14,6 +14,8 @@ * */ +#include <linux/acpi.h> +#include <linux/dmi.h> #include <linux/module.h> #include <linux/init.h> #include <linux/completion.h> @@ -2371,7 +2373,7 @@ static void mxt_input_close(struct input_dev *dev) } #ifdef CONFIG_OF -static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) +static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) { struct mxt_platform_data *pdata; u32 *keymap; @@ -2379,7 +2381,7 @@ static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) int proplen, i, ret; if (!client->dev.of_node) - return ERR_PTR(-ENODEV); + return ERR_PTR(-ENOENT); pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) @@ -2410,25 +2412,132 @@ static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) return pdata; } #else -static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) +static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) { - dev_dbg(&client->dev, "No platform data specified\n"); - return ERR_PTR(-EINVAL); + return ERR_PTR(-ENOENT); +} +#endif + +#ifdef CONFIG_ACPI + +struct mxt_acpi_platform_data { + const char *hid; + struct mxt_platform_data pdata; +}; + +static unsigned int samus_touchpad_buttons[] = { + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + BTN_LEFT +}; + +static struct mxt_acpi_platform_data samus_platform_data[] = { + { + /* Touchpad */ + .hid = "ATML0000", + .pdata = { + .t19_num_keys = ARRAY_SIZE(samus_touchpad_buttons), + .t19_keymap = samus_touchpad_buttons, + }, + }, + { + /* 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, + }, + { } +}; + +static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client) +{ + struct acpi_device *adev; + const struct dmi_system_id *system_id; + const struct mxt_acpi_platform_data *acpi_pdata; + + /* + * Ignore ACPI devices representing bootloader mode. + * + * This is a bit of a hack: Google Chromebook BIOS creates ACPI + * devices for both application and bootloader modes, but we are + * interested in application mode only (if device is in bootloader + * mode we'll end up switching into application anyway). So far + * application mode addresses were all above 0x40, so we'll use it + * as a threshold. + */ + if (client->addr < 0x40) + return ERR_PTR(-ENXIO); + + adev = ACPI_COMPANION(&client->dev); + if (!adev) + return ERR_PTR(-ENOENT); + + system_id = dmi_first_match(mxt_dmi_table); + if (!system_id) + return ERR_PTR(-ENOENT); + + acpi_pdata = system_id->driver_data; + if (!acpi_pdata) + return ERR_PTR(-ENOENT); + + while (acpi_pdata->hid) { + if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid)) + return &acpi_pdata->pdata; + + acpi_pdata++; + } + + return ERR_PTR(-ENOENT); +} +#else +static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client) +{ + return ERR_PTR(-ENOENT); } #endif +static const struct mxt_platform_data * +mxt_get_platform_data(struct i2c_client *client) +{ + const struct mxt_platform_data *pdata; + + pdata = dev_get_platdata(&client->dev); + if (pdata) + return pdata; + + pdata = mxt_parse_dt(client); + if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT) + return pdata; + + pdata = mxt_parse_acpi(client); + if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT) + return pdata; + + dev_err(&client->dev, "No platform data specified\n"); + return ERR_PTR(-EINVAL); +} + static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mxt_data *data; const struct mxt_platform_data *pdata; int error; - pdata = dev_get_platdata(&client->dev); - if (!pdata) { - pdata = mxt_parse_dt(client); - if (IS_ERR(pdata)) - return PTR_ERR(pdata); - } + pdata = mxt_get_platform_data(client); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL); if (!data) { @@ -2536,6 +2645,15 @@ static const struct of_device_id mxt_of_match[] = { }; MODULE_DEVICE_TABLE(of, mxt_of_match); +#ifdef CONFIG_ACPI +static const struct acpi_device_id mxt_acpi_id[] = { + { "ATML0000", 0 }, /* Touchpad */ + { "ATML0001", 0 }, /* Touchscreen */ + { } +}; +MODULE_DEVICE_TABLE(acpi, mxt_acpi_id); +#endif + static const struct i2c_device_id mxt_id[] = { { "qt602240_ts", 0 }, { "atmel_mxt_ts", 0 }, @@ -2550,6 +2668,7 @@ static struct i2c_driver mxt_driver = { .name = "atmel_mxt_ts", .owner = THIS_MODULE, .of_match_table = of_match_ptr(mxt_of_match), + .acpi_match_table = ACPI_PTR(mxt_acpi_id), .pm = &mxt_pm_ops, }, .probe = mxt_probe, |
