| Message ID | 1399374372-29123-3-git-send-email-rogerq@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, May 06, 2014 at 02:06:07PM +0300, Roger Quadros wrote: > 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> Applied, thank you. > --- > drivers/input/touchscreen/pixcir_i2c_ts.c | 182 ++++++++++++++++++++++++++++-- > include/linux/input/pixcir_ts.h | 42 +++++++ > 2 files changed, 216 insertions(+), 8 deletions(-) > > diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c > index 8a083bd..96a1b1e 100644 > --- a/drivers/input/touchscreen/pixcir_i2c_ts.c > +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c > @@ -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) > @@ -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()) > @@ -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) > { > @@ -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); > @@ -176,11 +336,22 @@ 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; > @@ -188,13 +359,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, > > 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; > } > > diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h > index 7163d91..7942804 100644 > --- a/include/linux/input/pixcir_ts.h > +++ b/include/linux/input/pixcir_ts.h > @@ -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; > -- > 1.8.3.2 >
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c index 8a083bd..96a1b1e 100644 --- a/drivers/input/touchscreen/pixcir_i2c_ts.c +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c @@ -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) @@ -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()) @@ -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) { @@ -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); @@ -176,11 +336,22 @@ 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; @@ -188,13 +359,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, 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; } diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h index 7163d91..7942804 100644 --- a/include/linux/input/pixcir_ts.h +++ b/include/linux/input/pixcir_ts.h @@ -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;