xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Input: ads7846 - add device tree bindings

Browse Source 
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Daniel Mack
2013-06-27 23:42:17 -07:00
committed by Dmitry Torokhov
parent 57691a1e27
commit a608026eac
2 changed files with 195 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

115
drivers/input/touchscreen/ads7846.c
View File

@@ -27,6 +27,9 @@
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
@@ -1201,9 +1204,87 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
spi_message_add_tail(x, m);
}
#ifdef CONFIG_OF
static const struct of_device_id ads7846_dt_ids[] = {
{ .compatible = "ti,tsc2046", .data = (void *) 7846 },
{ .compatible = "ti,ads7843", .data = (void *) 7843 },
{ .compatible = "ti,ads7845", .data = (void *) 7845 },
{ .compatible = "ti,ads7846", .data = (void *) 7846 },
{ .compatible = "ti,ads7873", .data = (void *) 7873 },
{ }
};
MODULE_DEVICE_TABLE(of, ads7846_dt_ids);
static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
{
struct ads7846_platform_data *pdata;
struct device_node *node = dev->of_node;
const struct of_device_id *match;
if (!node) {
dev_err(dev, "Device does not have associated DT data\n");
return ERR_PTR(-EINVAL);
}
match = of_match_device(ads7846_dt_ids, dev);
if (!match) {
dev_err(dev, "Unknown device model\n");
return ERR_PTR(-EINVAL);
}
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->model = (unsigned long)match->data;
of_property_read_u16(node, "ti,vref-delay-usecs",
&pdata->vref_delay_usecs);
of_property_read_u16(node, "ti,vref-mv", &pdata->vref_mv);
pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on");
pdata->swap_xy = of_property_read_bool(node, "ti,swap-xy");
of_property_read_u16(node, "ti,settle-delay-usec",
&pdata->settle_delay_usecs);
of_property_read_u16(node, "ti,penirq-recheck-delay-usecs",
&pdata->penirq_recheck_delay_usecs);
of_property_read_u16(node, "ti,x-plate-ohms", &pdata->x_plate_ohms);
of_property_read_u16(node, "ti,y-plate-ohms", &pdata->y_plate_ohms);
of_property_read_u16(node, "ti,x-min", &pdata->x_min);
of_property_read_u16(node, "ti,y-min", &pdata->y_min);
of_property_read_u16(node, "ti,x-max", &pdata->x_max);
of_property_read_u16(node, "ti,y-max", &pdata->y_max);
of_property_read_u16(node, "ti,pressure-min", &pdata->pressure_min);
of_property_read_u16(node, "ti,pressure-max", &pdata->pressure_max);
of_property_read_u16(node, "ti,debounce-max", &pdata->debounce_max);
of_property_read_u16(node, "ti,debounce-tol", &pdata->debounce_tol);
of_property_read_u16(node, "ti,debounce-rep", &pdata->debounce_rep);
of_property_read_u32(node, "ti,pendown-gpio-debounce",
&pdata->gpio_pendown_debounce);
pdata->wakeup = of_property_read_bool(node, "linux,wakeup");
pdata->gpio_pendown = of_get_named_gpio(dev->of_node, "pendown-gpio", 0);
return pdata;
}
#else
static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
{
dev_err(dev, "no platform data defined\n");
return ERR_PTR(-EINVAL);
}
#endif
static int ads7846_probe(struct spi_device *spi)
{
const struct ads7846_platform_data *pdata = dev_get_platdata(&spi->dev);
const struct ads7846_platform_data *pdata;
struct ads7846 *ts;
struct ads7846_packet *packet;
struct input_dev *input_dev;
@@ -1212,22 +1293,18 @@ static int ads7846_probe(struct spi_device *spi)
if (!spi->irq) {
dev_dbg(&spi->dev, "no IRQ?\n");
return -ENODEV;
}
if (!pdata) {
dev_dbg(&spi->dev, "no platform data?\n");
return -ENODEV;
return -EINVAL;
}
/* don't exceed max specified sample rate */
if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
dev_err(&spi->dev, "f(sample) %d KHz?\n",
(spi->max_speed_hz/SAMPLE_BITS)/1000);
return -EINVAL;
}
/* We'd set TX word size 8 bits and RX word size to 13 bits ... except
/*
* We'd set TX word size 8 bits and RX word size to 13 bits ... except
* that even if the hardware can do that, the SPI controller driver
* may not. So we stick to very-portable 8 bit words, both RX and TX.
*/
@@ -1250,17 +1327,25 @@ static int ads7846_probe(struct spi_device *spi)
ts->packet = packet;
ts->spi = spi;
ts->input = input_dev;
ts->vref_mv = pdata->vref_mv;
ts->swap_xy = pdata->swap_xy;
mutex_init(&ts->lock);
init_waitqueue_head(&ts->wait);
pdata = dev_get_platdata(&spi->dev);
if (!pdata) {
pdata = ads7846_probe_dt(&spi->dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
ts->model = pdata->model ? : 7846;
ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
ts->pressure_max = pdata->pressure_max ? : ~0;
ts->vref_mv = pdata->vref_mv;
ts->swap_xy = pdata->swap_xy;
if (pdata->filter != NULL) {
if (pdata->filter_init != NULL) {
err = pdata->filter_init(pdata, &ts->filter_data);
@@ -1370,6 +1455,13 @@ static int ads7846_probe(struct spi_device *spi)
device_init_wakeup(&spi->dev, pdata->wakeup);
/*
* If device does not carry platform data we must have allocated it
* when parsing DT data.
*/
if (!dev_get_platdata(&spi->dev))
devm_kfree(&spi->dev, (void *)pdata);
return 0;
err_remove_attr_group:
@@ -1437,6 +1529,7 @@ static struct spi_driver ads7846_driver = {
.name = "ads7846",
.owner = THIS_MODULE,
.pm = &ads7846_pm,
.of_match_table = of_match_ptr(ads7846_dt_ids),
},
.probe = ads7846_probe,
.remove = ads7846_remove,