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Message-Id: <20190125175045.22576-3-pawel.mikolaj.chmiel@gmail.com>
Date: Fri, 25 Jan 2019 18:50:43 +0100
From: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To: dmitry.torokhov@...il.com
Cc: robh+dt@...nel.org, mark.rutland@....com,
mchehab+samsung@...nel.org, colyli@...e.de,
ckeepax@...nsource.wolfsonmicro.com, andrew.smirnov@...il.com,
arnd@...db.de, xiaotong.lu@...eadtrum.com, xc-racer2@...e.ca,
pawel.mikolaj.chmiel@...il.com, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 2/4] input: misc: gp2a: Add support for light sensor
From: Jonathan Bakker <xc-racer2@...e.ca>
The gp2a driver previously only supported the proximity part of the
sensor while the hardware supports both.
Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
---
drivers/input/misc/Kconfig | 2 +
drivers/input/misc/gp2ap002a00f.c | 71 +++++++++++++++++++++++++++++-
include/linux/input/gp2ap002a00f.h | 4 ++
3 files changed, 76 insertions(+), 1 deletion(-)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index ca59a2be9bc5..a532efb4e6d8 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -252,6 +252,8 @@ config INPUT_GP2A
tristate "Sharp GP2AP002A00F I2C Proximity/Opto sensor driver"
depends on I2C
depends on GPIOLIB || COMPILE_TEST
+ depends on IIO
+ select INPUT_POLLDEV
help
Say Y here if you have a Sharp GP2AP002A00F proximity/als combo-chip
hooked to an I2C bus.
diff --git a/drivers/input/misc/gp2ap002a00f.c b/drivers/input/misc/gp2ap002a00f.c
index 79c8c4c56d1a..090c8c313295 100644
--- a/drivers/input/misc/gp2ap002a00f.c
+++ b/drivers/input/misc/gp2ap002a00f.c
@@ -10,9 +10,12 @@
*/
#include <linux/i2c.h>
+#include <linux/iio/consumer.h>
+#include <linux/iio/iio.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/input.h>
+#include <linux/input-polldev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
@@ -20,7 +23,9 @@
#include <linux/input/gp2ap002a00f.h>
struct gp2a_data {
+ struct iio_channel *channel;
struct input_dev *input;
+ struct input_polled_dev *poll_dev;
const struct gp2a_platform_data *pdata;
struct i2c_client *i2c_client;
};
@@ -58,6 +63,19 @@ static irqreturn_t gp2a_irq(int irq, void *handle)
return IRQ_HANDLED;
}
+static void gp2a_poll(struct input_polled_dev *dev)
+{
+ struct gp2a_data *dt = dev->private;
+ int ret, value;
+
+ ret = iio_read_channel_processed(dt->channel, &value);
+ if (ret < 0)
+ dev_err(&dt->i2c_client->dev, "failed to read value!");
+
+ input_report_abs(dev->input, ABS_MISC, value);
+ input_sync(dev->input);
+}
+
static int gp2a_enable(struct gp2a_data *dt)
{
return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
@@ -127,7 +145,7 @@ static int gp2a_probe(struct i2c_client *client,
{
const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev);
struct gp2a_data *dt;
- int error;
+ int error, value;
if (!pdata)
return -EINVAL;
@@ -152,6 +170,49 @@ static int gp2a_probe(struct i2c_client *client,
dt->pdata = pdata;
dt->i2c_client = client;
+ dt->channel = devm_iio_channel_get(&client->dev, "light");
+ if (!IS_ERR(dt->channel)) {
+ if (!dt->channel->indio_dev) {
+ error = -ENXIO;
+ goto err_hw_shutdown;
+ }
+
+ if (dt->pdata->light_adc_max <= 0 ||
+ dt->pdata->light_adc_fuzz <= 0) {
+ error = -EINVAL;
+ goto err_hw_shutdown;
+ }
+
+ dt->poll_dev = devm_input_allocate_polled_device(&client->dev);
+ if (!dt->poll_dev) {
+ dev_err(&client->dev,
+ "failed to allocate polled input device");
+ error = -ENOMEM;
+ goto err_hw_shutdown;
+ }
+
+ if (!device_property_read_u32(&client->dev, "poll-interval",
+ &value))
+ dt->poll_dev->poll_interval = value;
+
+ dt->poll_dev->poll = gp2a_poll;
+ dt->poll_dev->private = dt;
+
+ dt->poll_dev->input->name = GP2A_I2C_NAME;
+
+ input_set_capability(dt->poll_dev->input, EV_ABS, ABS_MISC);
+ input_set_abs_params(dt->poll_dev->input, ABS_MISC, 0,
+ dt->pdata->light_adc_max,
+ dt->pdata->light_adc_fuzz, 0);
+
+ error = input_register_polled_device(dt->poll_dev);
+ if (error)
+ goto err_hw_shutdown;
+ } else if (PTR_ERR(dt->channel) == -EPROBE_DEFER) {
+ error = -EPROBE_DEFER;
+ goto err_hw_shutdown;
+ }
+
error = gp2a_initialize(dt);
if (error < 0)
goto err_hw_shutdown;
@@ -203,6 +264,8 @@ static int gp2a_remove(struct i2c_client *client)
const struct gp2a_platform_data *pdata = dt->pdata;
input_unregister_device(dt->input);
+ if (dt->poll_dev)
+ input_unregister_polled_device(dt->poll_dev);
if (pdata->hw_shutdown)
pdata->hw_shutdown(client);
@@ -243,6 +306,12 @@ static int __maybe_unused gp2a_resume(struct device *dev)
mutex_unlock(&dt->input->mutex);
}
+ if (dt->poll_dev) {
+ /* Out of range value so real value goes through next */
+ input_abs_set_val(dt->poll_dev->input, ABS_MISC,
+ -dt->pdata->light_adc_max);
+ }
+
return retval;
}
diff --git a/include/linux/input/gp2ap002a00f.h b/include/linux/input/gp2ap002a00f.h
index 3614a13a8297..0212948897b4 100644
--- a/include/linux/input/gp2ap002a00f.h
+++ b/include/linux/input/gp2ap002a00f.h
@@ -12,12 +12,16 @@
* @wakeup: Set to true if the proximity can wake the device from suspend
* @hw_setup: Callback for setting up hardware such as gpios and vregs
* @hw_shutdown: Callback for properly shutting down hardware
+ * @light_adc_max: Maximum adc value the light sensor will read
+ * @light_adc_fuzz: Fuzz value for light adc sensor
*/
struct gp2a_platform_data {
int vout_gpio;
bool wakeup;
int (*hw_setup)(struct i2c_client *client);
int (*hw_shutdown)(struct i2c_client *client);
+ int light_adc_max;
+ int light_adc_fuzz;
};
#endif
--
2.17.1
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