Re: [PATCH 6/6] Input: pixcir_i2c_ts - use standard OF touchscreen parsing code

From: Roger Quadros
Date: Tue Jul 07 2015 - 07:47:40 EST

On 07/07/15 03:30, Dmitry Torokhov wrote:
Let's switch to using standard touchscreen device properties parsing module
instead of doing it by hand in the driver.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

Acked-by: Roger Quadros <rogerq@xxxxxx>

cheers,
-roger

---
drivers/input/touchscreen/pixcir_i2c_ts.c | 95 ++++++++++++++-----------------
1 file changed, 44 insertions(+), 51 deletions(-)

diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 043d219..31f1c7d 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -24,9 +24,10 @@
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
-#include <linux/of.h>
+/*#include <linux/of.h>*/
#include <linux/of_device.h>
#include <linux/platform_data/pixcir_i2c_ts.h>

@@ -37,9 +38,9 @@ struct pixcir_i2c_ts_data {
struct input_dev *input;
struct gpio_desc *gpio_attb;
struct gpio_desc *gpio_reset;
- const struct pixcir_ts_platform_data *pdata;
- bool running;
+ const struct pixcir_i2c_chip_data *chip;
int max_fingers; /* Max fingers supported in this instance */
+ bool running;
};

struct pixcir_touch {
@@ -62,7 +63,7 @@ static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
u8 touch;
int ret, i;
int readsize;
- const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
+ const struct pixcir_i2c_chip_data *chip = tsdata->chip;

memset(report, 0, sizeof(struct pixcir_report_data));

@@ -115,13 +116,13 @@ static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
struct pixcir_touch *touch;
int n, i, slot;
struct device *dev = &ts->client->dev;
- const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
+ const struct pixcir_i2c_chip_data *chip = ts->chip;

n = report->num_touches;
if (n > PIXCIR_MAX_SLOTS)
n = PIXCIR_MAX_SLOTS;

- if (!chip->has_hw_ids) {
+ if (!ts->chip->has_hw_ids) {
for (i = 0; i < n; i++) {
touch = &report->touches[i];
pos[i].x = touch->x;
@@ -423,77 +424,59 @@ static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
#ifdef CONFIG_OF
static const struct of_device_id pixcir_of_match[];

-static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
+static int pixcir_parse_dt(struct device *dev,
+ struct pixcir_i2c_ts_data *tsdata)
{
- struct pixcir_ts_platform_data *pdata;
- struct device_node *np = dev->of_node;
const struct of_device_id *match;

match = of_match_device(of_match_ptr(pixcir_of_match), dev);
if (!match)
- return ERR_PTR(-EINVAL);
-
- pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return ERR_PTR(-ENOMEM);
-
- pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
-
- if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
- dev_err(dev, "Failed to get touchscreen-size-x property\n");
- return ERR_PTR(-EINVAL);
- }
- pdata->x_max -= 1;
-
- if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
- dev_err(dev, "Failed to get touchscreen-size-y property\n");
- return ERR_PTR(-EINVAL);
- }
- pdata->y_max -= 1;
+ return -EINVAL;

- dev_dbg(dev, "%s: x %d, y %d\n", __func__,
- pdata->x_max + 1, pdata->y_max + 1);
+ tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
+ if (!tsdata->chip)
+ return -EINVAL;

- return pdata;
+ return 0;
}
#else
-static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
+static int pixcir_parse_dt(struct device *dev,
+ struct pixcir_i2c_ts_data *tsdata)
{
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}
#endif

static int pixcir_i2c_ts_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+ const struct i2c_device_id *id)
{
const struct pixcir_ts_platform_data *pdata =
dev_get_platdata(&client->dev);
struct device *dev = &client->dev;
- struct device_node *np = dev->of_node;
struct pixcir_i2c_ts_data *tsdata;
struct input_dev *input;
int error;

- if (np && !pdata) {
- pdata = pixcir_parse_dt(dev);
- if (IS_ERR(pdata))
- return PTR_ERR(pdata);
- }
+ tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
+ if (!tsdata)
+ return -ENOMEM;

- if (!pdata) {
+ if (pdata) {
+ tsdata->chip = &pdata->chip;
+ } else if (dev->of_node) {
+ error = pixcir_parse_dt(dev, tsdata);
+ if (error)
+ return error;
+ } else {
dev_err(&client->dev, "platform data not defined\n");
return -EINVAL;
}

- if (!pdata->chip.max_fingers) {
- dev_err(dev, "Invalid max_fingers in pdata\n");
+ if (!tsdata->chip->max_fingers) {
+ dev_err(dev, "Invalid max_fingers in chip data\n");
return -EINVAL;
}

- tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
- if (!tsdata)
- return -ENOMEM;
-
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "Failed to allocate input device\n");
@@ -502,7 +485,6 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,

tsdata->client = client;
tsdata->input = input;
- tsdata->pdata = pdata;

input->name = client->name;
input->id.bustype = BUS_I2C;
@@ -510,10 +492,21 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
input->close = pixcir_input_close;
input->dev.parent = &client->dev;

- input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
- input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
+ if (pdata) {
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
+ } else {
+ input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
+ input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
+ touchscreen_parse_properties(input, true);
+ if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
+ !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
+ dev_err(dev, "Touchscreen size is not specified\n");
+ return -EINVAL;
+ }
+ }

- tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
+ tsdata->max_fingers = tsdata->chip->max_fingers;
if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
tsdata->max_fingers = PIXCIR_MAX_SLOTS;
dev_info(dev, "Limiting maximum fingers to %d\n",

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