The GP2A002 is a I2C interfaced Sensor for Proximity/Ambient
This patch adds support the GP2A002 sensor
Signed-off-by: Minkyu Kang <mk7.kang@xxxxxxxxxxx>
Signed-off-by: Suchang Woo <suchang.woo@xxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 7 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/gp2ap002.c | 471 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/gp2ap002.h | 21 ++
4 files changed, 500 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/gp2ap002.c
create mode 100644 include/linux/gp2ap002.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 2d50166..cc4e200 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1017,6 +1017,13 @@ config SENSORS_APPLESMC
Say Y here if you have an applicable laptop and want to experience
the awesome power of applesmc.
+config SENSORS_GP2AP002
+ tristate "GP2AP002 series Proximity/Ambient Sensor"
+ depends on HWMON && I2C
+ help
+ This driver provides support for Proximity/Ambient Sensor.
+
+
config HWMON_DEBUG_CHIP
bool "Hardware Monitoring Chip debugging messages"
default n
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b793dce..5dd1671 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_SENSORS_FSCPOS) += fscpos.o
obj-$(CONFIG_SENSORS_G760A) += g760a.o
obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
+obj-$(CONFIG_SENSORS_GP2AP002) += gp2ap002.o
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
diff --git a/drivers/hwmon/gp2ap002.c b/drivers/hwmon/gp2ap002.c
new file mode 100644
index 0000000..6861584
--- /dev/null
+++ b/drivers/hwmon/gp2ap002.c
@@ -0,0 +1,471 @@
+/*
+ * gp2ap002.c - Proximity/Ambient light sensor
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@xxxxxxxxxxx>
+ * Suchang Woo <suchang.woo@xxxxxxxxxxx>
+ * Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/gp2ap002.h>
+
+#define GP2AP002_PROX 0x00 /* Read Only */
+#define GP2AP002_GAIN 0x01
+#define GP2AP002_HYS 0x02
+#define GP2AP002_CYCLE 0x03
+#define GP2AP002_OPMOD 0x04
+#define GP2AP002_CON 0x06
+
+#define PROX_VO_NO_DETECT (0 << 0)
+#define PROX_VO_DETECT (1 << 0)
+
+#define GAIN_LED0_SMALL (0 << 3)
+#define GAIN_LED0_LARGE (1 << 3)
+
+#define HYS_HYSD (1 << 7)
+#define HYS_HYSC1 (1 << 6)
+#define HYS_HYSC0 (1 << 5)
+#define HYS_HYSF3 (1 << 3)
+#define HYS_HYSF2 (1 << 2)
+#define HYS_HYSF1 (1 << 1)
+#define HYS_HYSF0 (1 << 0)
+
+#define OPMOD_SSD_SHUTDOWN (0 << 0)
+#define OPMOD_SSD_OPERATING (1 << 0)
+#define OPMOD_VCON_NORMAL (0 << 1)
+#define OPMOD_VCON_IRQ (1 << 1)
+
+#define CON_OCON1 (1 << 4)
+#define CON_OCON0 (1 << 3)
+
+#define GP2AP002_MAX_LUX 10
+
+static int lux_table[GP2AP002_MAX_LUX] = {
+ 1, 165, 288, 497, 869, 1532, 2692, 4692, 8280, 100000,
+};
+
+struct gp2ap002_chip {
+ struct i2c_client *client;
+ struct device *dev;
+ struct input_dev *idev;
+ struct work_struct work;
+ struct mutex lock;
+
+ void (*power_enable)(int onoff);
+ int (*get_adc)(void);
+ int vo_gpio;
+
+ /* Proximity */
+ int enable;
+ int mode;
+ int vo;
+ /* Ambient Light */
+ int adc;
+ int level;
+};
+
+static int gp2ap002_write_reg(struct i2c_client *client, int reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static int gp2ap002_read_reg(struct i2c_client *client, int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static void gp2ap002_get_vo(struct gp2ap002_chip *chip)
+{
+ if (chip->mode == OPMOD_VCON_IRQ) {
+ chip->vo = gp2ap002_read_reg(chip->client,
+ GP2AP002_PROX) & PROX_VO_DETECT;
+ } else {
+ chip->vo = !gpio_get_value(chip->vo_gpio);
+ }
+}
+
+static void gp2ap002_get_adc(struct gp2ap002_chip *chip)
+{
+ if (chip->get_adc)
+ chip->adc = chip->get_adc();
+}
+
+static void gp2ap002_get_level(struct gp2ap002_chip *chip)
+{
+ int i;
+
+ gp2ap002_get_adc(chip);
+
+ for (i = 0; i < GP2AP002_MAX_LUX; i++) {
+ if (lux_table[i] > chip->adc) {
+ chip->level = i;
+ break;
+ }
+ }
+}
+
+static void gp2ap002_set_mode(struct gp2ap002_chip *chip, int enable)
+{
+ if (enable == chip->enable)
+ return;
+
+ chip->enable = enable;
+ chip->vo = 0;
+
+ gp2ap002_write_reg(chip->client, GP2AP002_OPMOD, OPMOD_SSD_SHUTDOWN);
+
+ if (enable) {
+ gp2ap002_write_reg(chip->client, GP2AP002_OPMOD,
+ OPMOD_SSD_OPERATING | chip->mode);
+ gp2ap002_get_vo(chip);
+ }
+}
+
+static void gp2ap002_set_enable(struct gp2ap002_chip *chip, const char *buf)
+{
+ if (!strncmp(buf, "1", 1))
+ gp2ap002_set_mode(chip, 1);
+ else if (!strncmp(buf, "0", 1))
+ gp2ap002_set_mode(chip, 0);
+}
+
+static void gp2ap002_update_data(struct gp2ap002_chip *chip)
+{
+ gp2ap002_get_vo(chip);
+ enable_irq(chip->client->irq);
+}
+
+static void gp2ap002_work(struct work_struct *work)
+{
+ struct gp2ap002_chip *chip = container_of(work,
+ struct gp2ap002_chip, work);
+
+ mutex_lock(&chip->lock);
+
+ gp2ap002_update_data(chip);
+
+ input_report_abs(chip->idev, ABS_DISTANCE, chip->vo);
+ input_sync(chip->idev);
+
+ mutex_unlock(&chip->lock);
+}
+
+static irqreturn_t gp2ap002_irq(int irq, void *data)
+{
+ struct gp2ap002_chip *chip = data;
+
+ if (!work_pending(&chip->work)) {
+ disable_irq_nosync(irq);
+ schedule_work(&chip->work);
+ } else {
+ dev_err(&chip->client->dev, "work pending\n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+#define GP2AP002_OUTPUT(name, field) \
+static ssize_t gp2ap002_show_##name(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct gp2ap002_chip *chip = dev_get_drvdata(dev); \
+ gp2ap002_get_##name(chip); \
+ return sprintf(buf, "%d\n", chip->field); \
+} \
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, gp2ap002_show_##name, NULL, 0);
+
+#define GP2AP002_INPUT(name, field) \
+static ssize_t gp2ap002_store_##name(struct device *dev, \
+ struct device_attribute *attr, const char *buf, size_t count) \
+{ \
+ struct gp2ap002_chip *chip = dev_get_drvdata(dev); \
+ if (!count) \
+ return -EINVAL; \
+ gp2ap002_set_##name(chip, buf); \
+ return count; \
+} \
+static ssize_t gp2ap002_show_##name(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct gp2ap002_chip *chip = dev_get_drvdata(dev); \
+ return sprintf(buf, "%d\n", chip->field); \
+} \
+static SENSOR_DEVICE_ATTR(name, S_IRUGO | S_IWUSR, \
+ gp2ap002_show_##name, gp2ap002_store_##name, 0);
+
+GP2AP002_OUTPUT(vo, vo);
+GP2AP002_INPUT(enable, enable);
+GP2AP002_OUTPUT(adc, adc);
+GP2AP002_OUTPUT(level, level);
+
+static struct attribute *proximity_attributes[] = {
+ &sensor_dev_attr_vo.dev_attr.attr,
+ &sensor_dev_attr_enable.dev_attr.attr,
+ NULL
+};
+
+static struct attribute *ambient_attributes[] = {
+ &sensor_dev_attr_adc.dev_attr.attr,
+ &sensor_dev_attr_level.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group proximity_group = {
+ .name = "proximity",
+ .attrs = proximity_attributes,
+};
+
+static const struct attribute_group ambient_group = {
+ .name = "ambient",
+ .attrs = ambient_attributes,
+};
+
+static void gp2ap002_unregister_input_device(struct gp2ap002_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+
+ if (client->irq > 0)
+ free_irq(client->irq, chip);
+
+ input_unregister_device(chip->idev);
+ input_free_device(chip->idev);
+}
+
+static int gp2ap002_register_input_device(struct gp2ap002_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ struct input_dev *idev;
+ int ret;
+
+ idev = chip->idev = input_allocate_device();
+ if (!idev) {
+ dev_err(&client->dev, "allocating input device is failed\n");
+ ret = -ENOMEM;
+ goto error_alloc;
+ }
+
+ idev->name = "GP2AP002 OpticalSensor";
+ idev->id.bustype = BUS_I2C;
+ idev->dev.parent = &client->dev;
+ idev->evbit[0] = BIT_MASK(EV_ABS);
+
+ input_set_abs_params(idev, ABS_DISTANCE, 0, 1, 0, 0);
+
+ input_set_drvdata(idev, chip);
+
+ ret = input_register_device(idev);
+ if (ret) {
+ dev_err(&client->dev, "registering input device is failed\n");
+ goto error_reg;
+ }
+
+ if (client->irq > 0) {
+ unsigned long irq_flag = IRQF_DISABLED;
+
+ if (chip->mode == OPMOD_VCON_IRQ)
+ irq_flag |= IRQF_TRIGGER_FALLING;
+ else
+ irq_flag |= IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
+
+ ret = request_irq(client->irq, gp2ap002_irq, irq_flag,
+ "GP2AP002 OpticalSensor", chip);
+ if (ret) {
+ dev_err(&client->dev, "can't get IRQ %d, ret %d\n",
+ client->irq, ret);
+ goto error_irq;
+ }
+ }
+
+ return 0;
+
+error_irq:
+ input_unregister_device(idev);
+error_reg:
+ input_free_device(idev);
+error_alloc:
+ return ret;
+}
+
+
+static int gp2ap002_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct gp2ap002_chip *chip;
+ struct gp2ap002_platform_data *pdata;
+ int ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ chip = kzalloc(sizeof(struct gp2ap002_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ pdata = client->dev.platform_data;
+
+ chip->client = client;
+ i2c_set_clientdata(client, chip);
+
+ chip->dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(chip->dev)) {
+ dev_err(&client->dev,
+ "Registering to hwmon device is failed\n");
+ ret = PTR_ERR(chip->dev);
+ goto error_hwmon;
+ }
+
+ ret = sysfs_create_group(&client->dev.kobj, &proximity_group);
+ if (ret) {
+ dev_err(&client->dev,
+ "Creating proximity attribute group failed\n");
+ goto error_sysfs1;
+ }
+
+ ret = sysfs_create_group(&client->dev.kobj, &ambient_group);
+ if (ret) {
+ dev_err(&client->dev,
+ "Creating light attribute group failed\n");
+ goto error_sysfs2;
+ }
+
+ ret = gp2ap002_register_input_device(chip);
+ if (ret) {
+ dev_err(&client->dev, "Registering input device is failed\n");
+ goto error_input;
+ }
+
+ chip->power_enable = pdata->power_enable;
+ chip->get_adc = pdata->get_adc;
+ chip->vo_gpio = pdata->vo_gpio;
+ chip->mode = pdata->prox_mode;
+
+ INIT_WORK(&chip->work, gp2ap002_work);
+ mutex_init(&chip->lock);
+
+ if (chip->power_enable)
+ chip->power_enable(0);
+
+ gp2ap002_set_mode(chip, pdata->enable);
+
+ return 0;
+
+error_input:
+ sysfs_remove_group(&client->dev.kobj, &ambient_group);
+error_sysfs2:
+ sysfs_remove_group(&client->dev.kobj, &proximity_group);
+error_sysfs1:
+ hwmon_device_unregister(chip->dev);
+error_hwmon:
+ i2c_set_clientdata(client, NULL);
+ kfree(chip);
+ return ret;
+}
+
+static int __exit gp2ap002_remove(struct i2c_client *client)
+{
+ struct gp2ap002_chip *chip = i2c_get_clientdata(client);
+
+ gp2ap002_unregister_input_device(chip);
+ hwmon_device_unregister(chip->dev);
+
+ sysfs_remove_group(&client->dev.kobj, &proximity_group);
+ sysfs_remove_group(&client->dev.kobj, &ambient_group);
+
+ i2c_set_clientdata(client, NULL);
+
+ if (chip->power_enable)
+ chip->power_enable(0);
+
+ kfree(chip);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int gp2ap002_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct gp2ap002_chip *chip = i2c_get_clientdata(client);
+ gp2ap002_set_mode(chip, 0);
+
+ return 0;
+}
+
+static int gp2ap002_resume(struct i2c_client *client)
+{
+ struct gp2ap002_chip *chip = i2c_get_clientdata(client);
+ gp2ap002_set_mode(chip, 1);
+
+ return 0;
+}
+
+#else
+
+#define gp2ap002_suspend NULL
+#define gp2ap002_resume NULL
+
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id gp2ap002_id[] = {
+ { "GP2AP002", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, gp2ap002_id);
+
+static struct i2c_driver gp2ap002_i2c_driver = {
+ .driver = {
+ .name = "GP2AP002",
+ },
+ .probe = gp2ap002_probe,
+ .remove = __exit_p(gp2ap002_remove),
+ .suspend = gp2ap002_suspend,
+ .resume = gp2ap002_resume,
+ .id_table = gp2ap002_id,
+};
+
+static int __init gp2ap002_init(void)
+{
+ return i2c_add_driver(&gp2ap002_i2c_driver);
+}
+module_init(gp2ap002_init);
+
+static void __exit gp2ap002_exit(void)
+{
+ i2c_del_driver(&gp2ap002_i2c_driver);
+}
+module_exit(gp2ap002_exit);
+
+MODULE_AUTHOR("Minkyu Kang <mk7.kang@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("GP2AP002 Proximity/Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/gp2ap002.h b/include/linux/gp2ap002.h
new file mode 100644
index 0000000..b6a950b
--- /dev/null
+++ b/include/linux/gp2ap002.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __GP2AP002_H_
+#define __GP2AP002_H_
+
+struct gp2ap002_platform_data {
+ int (*get_adc)(void);
+ void (*power_enable)(int);
+ int vo_gpio;
+ int prox_mode;
+ int enable;
+};
+
+#endif
--
1.5.4.3
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