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path: root/drivers/input/touchscreen/ads7846.c
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Diffstat (limited to 'drivers/input/touchscreen/ads7846.c')
-rw-r--r--drivers/input/touchscreen/ads7846.c123
1 files changed, 108 insertions, 15 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 84ccf140c1b..ea195360747 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -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>
@@ -961,9 +964,9 @@ static int ads7846_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume);
static int ads7846_setup_pendown(struct spi_device *spi,
- struct ads7846 *ts)
+ struct ads7846 *ts,
+ const struct ads7846_platform_data *pdata)
{
- struct ads7846_platform_data *pdata = spi->dev.platform_data;
int err;
/*
@@ -1003,7 +1006,7 @@ static int ads7846_setup_pendown(struct spi_device *spi,
* use formula #2 for pressure, not #3.
*/
static void ads7846_setup_spi_msg(struct ads7846 *ts,
- const struct ads7846_platform_data *pdata)
+ const struct ads7846_platform_data *pdata)
{
struct spi_message *m = &ts->msg[0];
struct spi_transfer *x = ts->xfer;
@@ -1201,33 +1204,107 @@ 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;
struct ads7846 *ts;
struct ads7846_packet *packet;
struct input_dev *input_dev;
- struct ads7846_platform_data *pdata = spi->dev.platform_data;
unsigned long irq_flags;
int err;
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);
@@ -1281,7 +1366,7 @@ static int ads7846_probe(struct spi_device *spi)
ts->filter = ads7846_no_filter;
}
- err = ads7846_setup_pendown(spi, ts);
+ err = ads7846_setup_pendown(spi, ts, pdata);
if (err)
goto err_cleanup_filter;
@@ -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,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 03:04:18 +0000