I2C device instantiation and reset logic for Atmel maXTouch touchscreen controller on Intel mid platforms.
Signed-off-by: Chris Leech <[email protected]> --- arch/x86/kernel/mrst.c | 72 +++++++++++++++++++++++++++++++ drivers/input/touchscreen/qt602240_ts.c | 1 2 files changed, 73 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c index 9ed9e6b..d1ebdc8 100644 --- a/arch/x86/kernel/mrst.c +++ b/arch/x86/kernel/mrst.c @@ -34,6 +34,7 @@ #include <linux/i2c/tc35894xbg.h> #include <linux/bh1770glc.h> #include <linux/leds-lp5523.h> +#include <linux/i2c/qt602240_ts.h> #include <asm/setup.h> #include <asm/mpspec_def.h> @@ -1032,6 +1033,76 @@ void *tc35894xbg_n_platform_data(void *info) &tc35894xbg_ncdk_data); } +static int qt602240_reset; +static int qt602240_intr; + +static int qt602240_hw_setup(struct i2c_client *client) +{ + int err; + int intr; + + err = gpio_request(qt602240_intr, "maXTouch-intr"); + if (err) { + dev_err(&client->dev, "GPIO-%d request failed (err %d)\n", + qt602240_intr, err); + goto err_request_intr; + } + + err = gpio_request(qt602240_reset, "maXTouch-reset"); + if (err) { + dev_err(&client->dev, "GPIO-%d request failed (err %d)\n", + qt602240_reset, err); + goto err_request_reset; + } + + err = gpio_direction_output(qt602240_reset, 0); + if (err) { + dev_err(&client->dev, "GPIO-%d direction set failed (err %d)\n", + qt602240_reset, err); + goto err_reset_direction; + } + + gpio_set_value(qt602240_reset, 1); + /* maXTouch wants 40mSec minimum after reset to get organized */ + /* double that to be safe as a maximum required delay */ + msleep(80); + return 0; + +err_reset_direction: + gpio_free(qt602240_reset); +err_request_reset: + gpio_free(qt602240_intr); +err_request_intr: + return -EIO; +} + +static void qt602240_hw_teardown(struct i2c_client *client) +{ + gpio_set_value(qt602240_reset, 0); + gpio_free(qt602240_reset); + gpio_free(qt602240_intr); +} + +static void *qt602240_platform_data(void *info) +{ + struct i2c_board_info *i2c_info = info; + static struct qt602240_platform_data pdata = { + .trust_nvm = 1, + .hw_setup = qt602240_hw_setup, + .hw_teardown = qt602240_hw_teardown, + }; + + qt602240_reset = get_gpio_by_name("TS0-reset"); + qt602240_intr = get_gpio_by_name("TS0-intr"); + if (qt602240_reset < 0 || qt602240_intr < 0) { + printk(KERN_ERR "Touchscreen-0 GPIOs not in SFI table\n"); + return NULL; + } + + i2c_info->irq = qt602240_intr + MRST_IRQ_OFFSET; + return &pdata; +} + static const struct devs_id device_ids[] = { {"pmic_gpio", SFI_DEV_TYPE_SPI, 1, &pmic_gpio_platform_data}, {"pmic_gpio", SFI_DEV_TYPE_IPC, 1, &pmic_gpio_platform_data}, @@ -1053,6 +1124,7 @@ static const struct devs_id device_ids[] = { {"pmic_audio", SFI_DEV_TYPE_IPC, 1, &no_platform_data}, {"msic_audio", SFI_DEV_TYPE_SPI, 1, &no_platform_data}, {"msic_audio", SFI_DEV_TYPE_IPC, 1, &no_platform_data}, + {"mXT224", SFI_DEV_TYPE_I2C, 0, &qt602240_platform_data}, {"i2c_TC35894-nEB1", SFI_DEV_TYPE_I2C, 0, &tc35894xbg_n_platform_data}, {"i2c_TC35894-i", SFI_DEV_TYPE_I2C, 0, &tc35894xbg_i_platform_data}, {"bh1770glc", SFI_DEV_TYPE_I2C, 0, &bh1770glc_platform_data_init}, diff --git a/drivers/input/touchscreen/qt602240_ts.c b/drivers/input/touchscreen/qt602240_ts.c index cc6ccf7..ff7b206 100644 --- a/drivers/input/touchscreen/qt602240_ts.c +++ b/drivers/input/touchscreen/qt602240_ts.c @@ -1435,6 +1435,7 @@ static int qt602240_resume(struct i2c_client *client) static const struct i2c_device_id qt602240_id[] = { { "qt602240_ts", 0 }, + { "mXT224", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, qt602240_id); _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
