input: ti_am33x_tsc: Add DT support
This patch adds DT support to touch driver. It also provides a binding document which is used by the MFD and IIO part of the device. This patch also renames steps_to_configure to coordinate_readouts because the original name misleads the purpose of the variable. Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com> Signed-off-by: Patil, Rachna <rachna@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Patil, Rachna
Sebastian Andrzej Siewior
parent
af9c2fe374
commit
0396310b0e
|
|
@ -0,0 +1,44 @@
|
|||
* TI - TSC ADC (Touschscreen and analog digital converter)
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Required properties:
|
||||
- child "tsc"
|
||||
ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen
|
||||
support on the platform.
|
||||
ti,x-plate-resistance: X plate resistance
|
||||
ti,coordiante-readouts: The sequencer supports a total of 16
|
||||
programmable steps each step is used to
|
||||
read a single coordinate. A single
|
||||
readout is enough but multiple reads can
|
||||
increase the quality.
|
||||
A value of 5 means, 5 reads for X, 5 for
|
||||
Y and 2 for Z (always). This utilises 12
|
||||
of the 16 software steps available. The
|
||||
remaining 4 can be used by the ADC.
|
||||
ti,wire-config: Different boards could have a different order for
|
||||
connecting wires on touchscreen. We need to provide an
|
||||
8 bit number where in the 1st four bits represent the
|
||||
analog lines and the next 4 bits represent positive/
|
||||
negative terminal on that input line. Notations to
|
||||
represent the input lines and terminals resoectively
|
||||
is as follows:
|
||||
AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
|
||||
XP = 0, XN = 1, YP = 2, YN = 3.
|
||||
- child "adc"
|
||||
ti,adc-channels: List of analog inputs available for ADC.
|
||||
AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
|
||||
|
||||
Example:
|
||||
tscadc: tscadc@44e0d000 {
|
||||
compatible = "ti,am3359-tscadc";
|
||||
tsc {
|
||||
ti,wires = <4>;
|
||||
ti,x-plate-resistance = <200>;
|
||||
ti,coordiante-readouts = <5>;
|
||||
ti,wire-config = <0x00 0x11 0x22 0x33>;
|
||||
};
|
||||
|
||||
adc {
|
||||
ti,adc-channels = <4 5 6 7>;
|
||||
};
|
||||
}
|
||||
|
|
@ -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);
|
||||
|
|
|
|||
|
|
@ -203,6 +203,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
|
|||
/* TSC Cell */
|
||||
cell = &tscadc->cells[TSC_CELL];
|
||||
cell->name = "tsc";
|
||||
cell->of_compatible = "ti,am3359-tsc";
|
||||
cell->platform_data = &tscadc;
|
||||
cell->pdata_size = sizeof(tscadc);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue