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path: root/drivers/input/touchscreen/ti_am335x_tsc.c
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Diffstat (limited to 'drivers/input/touchscreen/ti_am335x_tsc.c')
-rw-r--r--drivers/input/touchscreen/ti_am335x_tsc.c105
1 files changed, 82 insertions, 23 deletions
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 7b7de6035af..449c0fbbe1d 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -26,6 +26,8 @@
#include <linux/io.h>
#include <linux/input/ti_am335x_tsc.h>
#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/mfd/ti_am335x_tscadc.h>
@@ -47,7 +49,7 @@ struct titsc {
unsigned int wires;
unsigned int x_plate_resistance;
bool pen_down;
- int steps_to_configure;
+ int coordinate_readouts;
u32 config_inp[4];
u32 bit_xp, bit_xn, bit_yp, bit_yn;
u32 inp_xp, inp_xn, inp_yp, inp_yn;
@@ -123,7 +125,7 @@ static void titsc_step_config(struct titsc *ts_dev)
int i, total_steps;
/* Configure the Step registers */
- total_steps = 2 * ts_dev->steps_to_configure;
+ total_steps = 2 * ts_dev->coordinate_readouts;
config = STEPCONFIG_MODE_HWSYNC |
STEPCONFIG_AVG_16 | ts_dev->bit_xp;
@@ -141,7 +143,7 @@ static void titsc_step_config(struct titsc *ts_dev)
break;
}
- for (i = 1; i <= ts_dev->steps_to_configure; i++) {
+ for (i = 1; i <= ts_dev->coordinate_readouts; i++) {
titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
}
@@ -163,7 +165,7 @@ static void titsc_step_config(struct titsc *ts_dev)
break;
}
- for (i = (ts_dev->steps_to_configure + 1); i <= total_steps; i++) {
+ for (i = (ts_dev->coordinate_readouts + 1); i <= total_steps; i++) {
titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
}
@@ -218,7 +220,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
read = titsc_readl(ts_dev, REG_FIFO0);
channel = read & 0xf0000;
channel = channel >> 0x10;
- if ((channel >= 0) && (channel < ts_dev->steps_to_configure)) {
+ if ((channel >= 0) && (channel < ts_dev->coordinate_readouts)) {
read &= 0xfff;
diff = abs(read - prev_val_x);
if (diff < prev_diff_x) {
@@ -231,8 +233,8 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
read = titsc_readl(ts_dev, REG_FIFO1);
channel = read & 0xf0000;
channel = channel >> 0x10;
- if ((channel >= ts_dev->steps_to_configure) &&
- (channel < (2 * ts_dev->steps_to_configure - 1))) {
+ if ((channel >= ts_dev->coordinate_readouts) &&
+ (channel < (2 * ts_dev->coordinate_readouts - 1))) {
read &= 0xfff;
diff = abs(read - prev_val_y);
if (diff < prev_diff_y) {
@@ -310,6 +312,59 @@ static irqreturn_t titsc_irq(int irq, void *dev)
return IRQ_HANDLED;
}
+static int titsc_parse_dt(struct platform_device *pdev,
+ struct titsc *ts_dev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ int err;
+
+ if (!node)
+ return -EINVAL;
+
+ err = of_property_read_u32(node, "ti,wires", &ts_dev->wires);
+ if (err < 0)
+ return err;
+ switch (ts_dev->wires) {
+ case 4:
+ case 5:
+ case 8:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ err = of_property_read_u32(node, "ti,x-plate-resistance",
+ &ts_dev->x_plate_resistance);
+ if (err < 0)
+ return err;
+
+ err = of_property_read_u32(node, "ti,coordiante-readouts",
+ &ts_dev->coordinate_readouts);
+ if (err < 0)
+ return err;
+
+ return of_property_read_u32_array(node, "ti,wire-config",
+ ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
+}
+
+static int titsc_parse_pdata(struct ti_tscadc_dev *tscadc_dev,
+ struct titsc *ts_dev)
+{
+ struct mfd_tscadc_board *pdata = tscadc_dev->dev->platform_data;
+
+ if (!pdata)
+ return -EINVAL;
+
+ ts_dev->wires = pdata->tsc_init->wires;
+ ts_dev->x_plate_resistance =
+ pdata->tsc_init->x_plate_resistance;
+ ts_dev->steps_to_configure =
+ pdata->tsc_init->steps_to_configure;
+ memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
+ sizeof(pdata->tsc_init->wire_config));
+ return 0;
+}
+
/*
* The functions for inserting/removing driver as a module.
*/
@@ -319,16 +374,8 @@ static int titsc_probe(struct platform_device *pdev)
struct titsc *ts_dev;
struct input_dev *input_dev;
struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
- struct mfd_tscadc_board *pdata;
int err;
- pdata = tscadc_dev->dev->platform_data;
-
- if (!pdata) {
- dev_err(&pdev->dev, "Could not find platform data\n");
- return -EINVAL;
- }
-
/* Allocate memory for device */
ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL);
input_dev = input_allocate_device();
@@ -342,11 +389,16 @@ static int titsc_probe(struct platform_device *pdev)
ts_dev->mfd_tscadc = tscadc_dev;
ts_dev->input = input_dev;
ts_dev->irq = tscadc_dev->irq;
- ts_dev->wires = pdata->tsc_init->wires;
- ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
- ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
- memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
- sizeof(pdata->tsc_init->wire_config));
+
+ if (tscadc_dev->dev->platform_data)
+ err = titsc_parse_pdata(tscadc_dev, ts_dev);
+ else
+ err = titsc_parse_dt(pdev, ts_dev);
+
+ if (err) {
+ dev_err(&pdev->dev, "Could not find valid DT data.\n");
+ goto err_free_mem;
+ }
err = request_irq(ts_dev->irq, titsc_irq,
0, pdev->dev.driver->name, ts_dev);
@@ -362,7 +414,7 @@ static int titsc_probe(struct platform_device *pdev)
goto err_free_irq;
}
titsc_step_config(ts_dev);
- titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
+ titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->coordinate_readouts);
input_dev->name = "ti-tsc";
input_dev->dev.parent = &pdev->dev;
@@ -398,7 +450,7 @@ static int titsc_remove(struct platform_device *pdev)
free_irq(ts_dev->irq, ts_dev);
/* total steps followed by the enable mask */
- steps = 2 * ts_dev->steps_to_configure + 2;
+ steps = 2 * ts_dev->coordinate_readouts + 2;
steps = (1 << steps) - 1;
am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps);
@@ -439,7 +491,7 @@ static int titsc_resume(struct device *dev)
}
titsc_step_config(ts_dev);
titsc_writel(ts_dev, REG_FIFO0THR,
- ts_dev->steps_to_configure);
+ ts_dev->coordinate_readouts);
return 0;
}
@@ -452,6 +504,12 @@ static const struct dev_pm_ops titsc_pm_ops = {
#define TITSC_PM_OPS NULL
#endif
+static const struct of_device_id ti_tsc_dt_ids[] = {
+ { .compatible = "ti,am3359-tsc", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids);
+
static struct platform_driver ti_tsc_driver = {
.probe = titsc_probe,
.remove = titsc_remove,
@@ -459,6 +517,7 @@ static struct platform_driver ti_tsc_driver = {
.name = "tsc",
.owner = THIS_MODULE,
.pm = TITSC_PM_OPS,
+ .of_match_table = of_match_ptr(ti_tsc_dt_ids),
},
};
module_platform_driver(ti_tsc_driver);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-16 12:39:59 +0000