diff options
Diffstat (limited to 'arch/arm/boards/guf-santaro/board.c')
| -rw-r--r-- | arch/arm/boards/guf-santaro/board.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/arm/boards/guf-santaro/board.c b/arch/arm/boards/guf-santaro/board.c index b9a52ee258..e54110886b 100644 --- a/arch/arm/boards/guf-santaro/board.c +++ b/arch/arm/boards/guf-santaro/board.c @@ -11,6 +11,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ +#define pr_fmt(fmt) "Santaro: " fmt #include <common.h> #include <init.h> @@ -25,6 +26,105 @@ #include <bbu.h> #include <mach/bbu.h> #include <mach/imx6.h> +#include <i2c/i2c.h> +#include <gpio.h> + +static int i2c_device_present(struct i2c_adapter *adapter, int addr) +{ + struct i2c_client client = {}; + u8 reg; + + client.adapter = adapter; + client.addr = addr; + + return i2c_write_reg(&client, 0x00, ®, 0) < 0 ? false : true; +} + +#define TOUCH_RESET_GPIO IMX_GPIO_NR(1, 20) + +static int edt_present, egalax_present; + +static int santaro_touch_fixup(struct device_node *root, void *unused) +{ + struct device_node *i2cnp, *np; + + i2cnp = of_find_node_by_alias(root, "i2c2"); + if (!i2cnp) { + pr_err("Cannot find node i2c2\n"); + return -EINVAL; + } + + for_each_child_of_node(i2cnp, np) { + int present; + + if (of_device_is_compatible(np, "edt,edt-ft5206")) + present = edt_present; + else if (of_device_is_compatible(np, "eeti,egalax_ts")) + present = egalax_present; + else + continue; + + if (present) + of_device_enable(np); + else + of_device_disable(np); + } + + return 0; +} + +static int santaro_detect_touch(void) +{ + struct device_node *np; + struct i2c_adapter *adapter; + const char *model = NULL; + + if (!of_machine_is_compatible("guf,imx6q-santaro")) + return 0; + + /* + * The Santaro has two different possible Touchscreen + * controllers. Both are on different I2C addresses. + * Let's probe both of them and enable in the device tree + * the one that's actually found on the hardware. + */ + + np = of_find_node_by_alias(NULL, "i2c2"); + if (!np) { + pr_err("Cannot find node i2c2\n"); + return -EINVAL; + } + + adapter = of_find_i2c_adapter_by_node(np); + if (!adapter) { + pr_err("Cannot find i2c2 adapter\n"); + return -EINVAL; + } + + gpio_direction_output(TOUCH_RESET_GPIO, 0); + mdelay(10); + gpio_set_value(TOUCH_RESET_GPIO, 1); + mdelay(10); + + edt_present = i2c_device_present(adapter, 0x38); + + gpio_set_value(TOUCH_RESET_GPIO, 0); + mdelay(10); + + egalax_present = i2c_device_present(adapter, 0x4); + + if (edt_present) + model = "edt,edt-ft5206"; + if (egalax_present) + model = "eeti,egalax_ts"; + + pr_info("Found %s Touchscreen controller\n", model); + + of_register_fixup(santaro_touch_fixup, NULL); + + return 0; +} +late_initcall(santaro_detect_touch); static int santaro_device_init(void) { |