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Input: pixcir_i2c_ts - initialize interrupt mode and power mode
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Introduce helper functions to configure power and interrupt registers.
Default to IDLE mode on probe as device supports auto wakeup to ACVIE mode
on detecting finger touch.

Configure interrupt mode and polarity on start up.  Power down on device
closure or module removal.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Roger Quadros authored and Dmitry Torokhov committed May 19, 2014
1 parent e9d4718 commit 3b36fbb
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Showing 2 changed files with 216 additions and 8 deletions.
182 changes: 174 additions & 8 deletions drivers/input/touchscreen/pixcir_i2c_ts.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ struct pixcir_i2c_ts_data {
struct i2c_client *client;
struct input_dev *input;
const struct pixcir_ts_platform_data *chip;
bool exiting;
bool running;
};

static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
Expand Down Expand Up @@ -88,7 +88,7 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
struct pixcir_i2c_ts_data *tsdata = dev_id;

while (!tsdata->exiting) {
while (tsdata->running) {
pixcir_ts_poscheck(tsdata);

if (tsdata->chip->attb_read_val())
Expand All @@ -100,6 +100,164 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}

static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
enum pixcir_power_mode mode)
{
struct device *dev = &ts->client->dev;
int ret;

ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
if (ret < 0) {
dev_err(dev, "%s: can't read reg 0x%x : %d\n",
__func__, PIXCIR_REG_POWER_MODE, ret);
return ret;
}

ret &= ~PIXCIR_POWER_MODE_MASK;
ret |= mode;

/* Always AUTO_IDLE */
ret |= PIXCIR_POWER_ALLOW_IDLE;

ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
if (ret < 0) {
dev_err(dev, "%s: can't write reg 0x%x : %d\n",
__func__, PIXCIR_REG_POWER_MODE, ret);
return ret;
}

return 0;
}

/*
* Set the interrupt mode for the device i.e. ATTB line behaviour
*
* @polarity : 1 for active high, 0 for active low.
*/
static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
enum pixcir_int_mode mode, bool polarity)
{
struct device *dev = &ts->client->dev;
int ret;

ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
if (ret < 0) {
dev_err(dev, "%s: can't read reg 0x%x : %d\n",
__func__, PIXCIR_REG_INT_MODE, ret);
return ret;
}

ret &= ~PIXCIR_INT_MODE_MASK;
ret |= mode;

if (polarity)
ret |= PIXCIR_INT_POL_HIGH;
else
ret &= ~PIXCIR_INT_POL_HIGH;

ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
if (ret < 0) {
dev_err(dev, "%s: can't write reg 0x%x : %d\n",
__func__, PIXCIR_REG_INT_MODE, ret);
return ret;
}

return 0;
}

/*
* Enable/disable interrupt generation
*/
static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
{
struct device *dev = &ts->client->dev;
int ret;

ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
if (ret < 0) {
dev_err(dev, "%s: can't read reg 0x%x : %d\n",
__func__, PIXCIR_REG_INT_MODE, ret);
return ret;
}

if (enable)
ret |= PIXCIR_INT_ENABLE;
else
ret &= ~PIXCIR_INT_ENABLE;

ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
if (ret < 0) {
dev_err(dev, "%s: can't write reg 0x%x : %d\n",
__func__, PIXCIR_REG_INT_MODE, ret);
return ret;
}

return 0;
}

static int pixcir_start(struct pixcir_i2c_ts_data *ts)
{
struct device *dev = &ts->client->dev;
int error;

/* LEVEL_TOUCH interrupt with active low polarity */
error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
if (error) {
dev_err(dev, "Failed to set interrupt mode: %d\n", error);
return error;
}

ts->running = true;
mb(); /* Update status before IRQ can fire */

/* enable interrupt generation */
error = pixcir_int_enable(ts, true);
if (error) {
dev_err(dev, "Failed to enable interrupt generation: %d\n",
error);
return error;
}

return 0;
}

static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
{
int error;

/* Disable interrupt generation */
error = pixcir_int_enable(ts, false);
if (error) {
dev_err(&ts->client->dev,
"Failed to disable interrupt generation: %d\n",
error);
return error;
}

/* Exit ISR if running, no more report parsing */
ts->running = false;
mb(); /* update status before we synchronize irq */

/* Wait till running ISR is complete */
synchronize_irq(ts->client->irq);

return 0;
}

static int pixcir_input_open(struct input_dev *dev)
{
struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

return pixcir_start(ts);
}

static void pixcir_input_close(struct input_dev *dev)
{
struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

pixcir_stop(ts);
}

#ifdef CONFIG_PM_SLEEP
static int pixcir_i2c_ts_suspend(struct device *dev)
{
Expand Down Expand Up @@ -156,6 +314,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,

input->name = client->name;
input->id.bustype = BUS_I2C;
input->open = pixcir_input_open;
input->close = pixcir_input_close;
input->dev.parent = &client->dev;

__set_bit(EV_KEY, input->evbit);
Expand All @@ -176,25 +336,31 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
return error;
}

/* Always be in IDLE mode to save power, device supports auto wake */
error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
if (error) {
dev_err(dev, "Failed to set IDLE mode\n");
return error;
}

/* Stop device till opened */
error = pixcir_stop(tsdata);
if (error)
return error;

error = input_register_device(input);
if (error)
return error;

i2c_set_clientdata(client, tsdata);
device_init_wakeup(&client->dev, 1);

return 0;
}

static int pixcir_i2c_ts_remove(struct i2c_client *client)
{
struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);

device_init_wakeup(&client->dev, 0);

tsdata->exiting = true;
mb();

return 0;
}

Expand Down
42 changes: 42 additions & 0 deletions include/linux/input/pixcir_ts.h
View file
Original file line number Diff line number Diff line change
@@ -1,6 +1,48 @@
#ifndef _PIXCIR_I2C_TS_H
#define _PIXCIR_I2C_TS_H

/*
* Register map
*/
#define PIXCIR_REG_POWER_MODE 51
#define PIXCIR_REG_INT_MODE 52

/*
* Power modes:
* active: max scan speed
* idle: lower scan speed with automatic transition to active on touch
* halt: datasheet says sleep but this is more like halt as the chip
* clocks are cut and it can only be brought out of this mode
* using the RESET pin.
*/
enum pixcir_power_mode {
PIXCIR_POWER_ACTIVE,
PIXCIR_POWER_IDLE,
PIXCIR_POWER_HALT,
};

#define PIXCIR_POWER_MODE_MASK 0x03
#define PIXCIR_POWER_ALLOW_IDLE (1UL << 2)

/*
* Interrupt modes:
* periodical: interrupt is asserted periodicaly
* diff coordinates: interrupt is asserted when coordinates change
* level on touch: interrupt level asserted during touch
* pulse on touch: interrupt pulse asserted druing touch
*
*/
enum pixcir_int_mode {
PIXCIR_INT_PERIODICAL,
PIXCIR_INT_DIFF_COORD,
PIXCIR_INT_LEVEL_TOUCH,
PIXCIR_INT_PULSE_TOUCH,
};

#define PIXCIR_INT_MODE_MASK 0x03
#define PIXCIR_INT_ENABLE (1UL << 3)
#define PIXCIR_INT_POL_HIGH (1UL << 2)

struct pixcir_ts_platform_data {
int (*attb_read_val)(void);
int x_max;
Expand Down

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