Input: add driver for Sharp gp2ap002a00f proximity sensor

This driver adds support for Sharp's GP2AP002A00F proximity sensor. The
proximity is measured as a binary switch, i.e. an object is either
detected or not detected. Hence, this driver is implemented as a switch
that reports SW_FRONT_PROXIMITY.

Reviewed-by: Datta Shubhrajyoti <shubhrajyoti@ti.com>
Signed-off-by: Courtney Cavin <courtney.cavin@sonyericsson.com>
Signed-off-by: Oskar Andero <oskar.andero@sonyericsson.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

4 files changed, 334 insertions, 1 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index e53b443d1e33..7b46781c30c9 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -179,6 +179,17 @@ config INPUT_APANEL
          To compile this driver as a module, choose M here: the module will
          be called apanel.
 
+config INPUT_GP2A
+        tristate "Sharp GP2AP002A00F I2C Proximity/Opto sensor driver"
+        depends on I2C
+        depends on GENERIC_GPIO
+        help
+          Say Y here if you have a Sharp GP2AP002A00F proximity/als combo-chip
+          hooked to an I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called gp2ap002a00f.
+
 config INPUT_GPIO_TILT_POLLED
         tristate "Polled GPIO tilt switch"
         depends on GENERIC_GPIO
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 90070c1a4ad3..46671a875b91 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -22,8 +22,9 @@ obj-$(CONFIG_INPUT_CMA3000)		+= cma3000_d0x.o
 obj-$(CONFIG_INPUT_CMA3000_I2C)         += cma3000_d0x_i2c.o
 obj-$(CONFIG_INPUT_COBALT_BTNS)         += cobalt_btns.o
 obj-$(CONFIG_INPUT_DM355EVM)            += dm355evm_keys.o
-obj-$(CONFIG_HP_SDC_RTC)                += hp_sdc_rtc.o
+obj-$(CONFIG_INPUT_GP2A)                += gp2ap002a00f.o
 obj-$(CONFIG_INPUT_GPIO_TILT_POLLED)    += gpio_tilt_polled.o
+obj-$(CONFIG_HP_SDC_RTC)                += hp_sdc_rtc.o
 obj-$(CONFIG_INPUT_IXP4XX_BEEPER)       += ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)      += keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)               += kxtj9.o
diff --git a/drivers/input/misc/gp2ap002a00f.c b/drivers/input/misc/gp2ap002a00f.c
new file mode 100644
index 000000000000..71fba8c2fc66
--- /dev/null
+++ b/drivers/input/misc/gp2ap002a00f.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
+ *
+ * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
+ * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
+ *
+ * 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/i2c.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/input/gp2ap002a00f.h>
+
+struct gp2a_data {
+        struct input_dev *input;
+        const struct gp2a_platform_data *pdata;
+        struct i2c_client *i2c_client;
+};
+
+enum gp2a_addr {
+        GP2A_ADDR_PROX  = 0x0,
+        GP2A_ADDR_GAIN  = 0x1,
+        GP2A_ADDR_HYS   = 0x2,
+        GP2A_ADDR_CYCLE = 0x3,
+        GP2A_ADDR_OPMOD = 0x4,
+        GP2A_ADDR_CON   = 0x6
+};
+
+enum gp2a_controls {
+        /* Software Shutdown control: 0 = shutdown, 1 = normal operation */
+        GP2A_CTRL_SSD   = 0x01
+};
+
+static int gp2a_report(struct gp2a_data *dt)
+{
+        int vo = gpio_get_value(dt->pdata->vout_gpio);
+
+        input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);
+        input_sync(dt->input);
+
+        return 0;
+}
+
+static irqreturn_t gp2a_irq(int irq, void *handle)
+{
+        struct gp2a_data *dt = handle;
+
+        gp2a_report(dt);
+
+        return IRQ_HANDLED;
+}
+
+static int gp2a_enable(struct gp2a_data *dt)
+{
+        return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
+                                         GP2A_CTRL_SSD);
+}
+
+static int gp2a_disable(struct gp2a_data *dt)
+{
+        return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
+                                         0x00);
+}
+
+static int gp2a_device_open(struct input_dev *dev)
+{
+        struct gp2a_data *dt = input_get_drvdata(dev);
+        int error;
+
+        error = gp2a_enable(dt);
+        if (error < 0) {
+                dev_err(&dt->i2c_client->dev,
+                        "unable to activate, err %d\n", error);
+                return error;
+        }
+
+        gp2a_report(dt);
+
+        return 0;
+}
+
+static void gp2a_device_close(struct input_dev *dev)
+{
+        struct gp2a_data *dt = input_get_drvdata(dev);
+        int error;
+
+        error = gp2a_disable(dt);
+        if (error < 0)
+                dev_err(&dt->i2c_client->dev,
+                        "unable to deactivate, err %d\n", error);
+}
+
+static int __devinit gp2a_initialize(struct gp2a_data *dt)
+{
+        int error;
+
+        error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN,
+                                          0x08);
+        if (error < 0)
+                return error;
+
+        error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS,
+                                          0xc2);
+        if (error < 0)
+                return error;
+
+        error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE,
+                                          0x04);
+        if (error < 0)
+                return error;
+
+        error = gp2a_disable(dt);
+
+        return error;
+}
+
+static int __devinit gp2a_probe(struct i2c_client *client,
+                                const struct i2c_device_id *id)
+{
+        const struct gp2a_platform_data *pdata = client->dev.platform_data;
+        struct gp2a_data *dt;
+        int error;
+
+        if (!pdata)
+                return -EINVAL;
+
+        if (pdata->hw_setup) {
+                error = pdata->hw_setup(client);
+                if (error < 0)
+                        return error;
+        }
+
+        error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME);
+        if (error)
+                goto err_hw_shutdown;
+
+        dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
+        if (!dt) {
+                error = -ENOMEM;
+                goto err_free_gpio;
+        }
+
+        dt->pdata = pdata;
+        dt->i2c_client = client;
+
+        error = gp2a_initialize(dt);
+        if (error < 0)
+                goto err_free_mem;
+
+        dt->input = input_allocate_device();
+        if (!dt->input) {
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        input_set_drvdata(dt->input, dt);
+
+        dt->input->open = gp2a_device_open;
+        dt->input->close = gp2a_device_close;
+        dt->input->name = GP2A_I2C_NAME;
+        dt->input->id.bustype = BUS_I2C;
+        dt->input->dev.parent = &client->dev;
+
+        input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY);
+
+        error = request_threaded_irq(client->irq, NULL, gp2a_irq,
+                        IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                                IRQF_ONESHOT,
+                        GP2A_I2C_NAME, dt);
+        if (error) {
+                dev_err(&client->dev, "irq request failed\n");
+                goto err_free_input_dev;
+        }
+
+        error = input_register_device(dt->input);
+        if (error) {
+                dev_err(&client->dev, "device registration failed\n");
+                goto err_free_irq;
+        }
+
+        device_init_wakeup(&client->dev, pdata->wakeup);
+        i2c_set_clientdata(client, dt);
+
+        return 0;
+
+err_free_irq:
+        free_irq(client->irq, dt);
+err_free_input_dev:
+        input_free_device(dt->input);
+err_free_mem:
+        kfree(dt);
+err_free_gpio:
+        gpio_free(pdata->vout_gpio);
+err_hw_shutdown:
+        if (pdata->hw_shutdown)
+                pdata->hw_shutdown(client);
+        return error;
+}
+
+static int __devexit gp2a_remove(struct i2c_client *client)
+{
+        struct gp2a_data *dt = i2c_get_clientdata(client);
+        const struct gp2a_platform_data *pdata = dt->pdata;
+
+        device_init_wakeup(&client->dev, false);
+
+        free_irq(client->irq, dt);
+
+        input_unregister_device(dt->input);
+        kfree(dt);
+
+        gpio_free(pdata->vout_gpio);
+
+        if (pdata->hw_shutdown)
+                pdata->hw_shutdown(client);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int gp2a_suspend(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct gp2a_data *dt = i2c_get_clientdata(client);
+        int retval = 0;
+
+        if (device_may_wakeup(&client->dev)) {
+                enable_irq_wake(client->irq);
+        } else {
+                mutex_lock(&dt->input->mutex);
+                if (dt->input->users)
+                        retval = gp2a_disable(dt);
+                mutex_unlock(&dt->input->mutex);
+        }
+
+        return retval;
+}
+
+static int gp2a_resume(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct gp2a_data *dt = i2c_get_clientdata(client);
+        int retval = 0;
+
+        if (device_may_wakeup(&client->dev)) {
+                disable_irq_wake(client->irq);
+        } else {
+                mutex_lock(&dt->input->mutex);
+                if (dt->input->users)
+                        retval = gp2a_enable(dt);
+                mutex_unlock(&dt->input->mutex);
+        }
+
+        return retval;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
+
+static const struct i2c_device_id gp2a_i2c_id[] = {
+        { GP2A_I2C_NAME, 0 },
+        { }
+};
+
+static struct i2c_driver gp2a_i2c_driver = {
+        .driver = {
+                .name   = GP2A_I2C_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &gp2a_pm,
+        },
+        .probe          = gp2a_probe,
+        .remove         = __devexit_p(gp2a_remove),
+        .id_table       = gp2a_i2c_id,
+};
+
+static int __init gp2a_init(void)
+{
+        return i2c_add_driver(&gp2a_i2c_driver);
+}
+
+static void __exit gp2a_exit(void)
+{
+        i2c_del_driver(&gp2a_i2c_driver);
+}
+
+module_init(gp2a_init);
+module_exit(gp2a_exit);
+
+MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
+MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/input/gp2ap002a00f.h b/include/linux/input/gp2ap002a00f.h
new file mode 100644
index 000000000000..aad2fd44a61a
--- /dev/null
+++ b/include/linux/input/gp2ap002a00f.h
@@ -0,0 +1,22 @@
+#ifndef _GP2AP002A00F_H_
+#define _GP2AP002A00F_H_
+
+#include <linux/i2c.h>
+
+#define GP2A_I2C_NAME "gp2ap002a00f"
+
+/**
+ * struct gp2a_platform_data - Sharp gp2ap002a00f proximity platform data
+ * @vout_gpio: The gpio connected to the object detected pin (VOUT)
+ * @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
+ */
+struct gp2a_platform_data {
+        int vout_gpio;
+        bool wakeup;
+        int (*hw_setup)(struct i2c_client *client);
+        int (*hw_shutdown)(struct i2c_client *client);
+};
+
+#endif