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Message-ID: <20111115094342.GD13157@core.coreip.homeip.net>
Date: Tue, 15 Nov 2011 01:43:42 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: oskar.andero@...yericsson.com
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
jic23@....ac.uk, aghayal@...eaurora.org,
Courtney Cavin <courtney.cavin@...yericsson.com>
Subject: Re: [PATCH v3] input: add driver support for Sharp gp2ap002a00f
proximity sensor
On Tue, Nov 15, 2011 at 10:26:00AM +0100, oskar.andero@...yericsson.com wrote:
> From: Courtney Cavin <courtney.cavin@...yericsson.com>
>
> Signed-off-by: Courtney Cavin <courtney.cavin@...yericsson.com>
> Signed-off-by: Oskar Andero <oskar.andero@...yericsson.com>
> ---
> drivers/input/misc/Kconfig | 10 ++
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/gp2ap002a00f.c | 300 ++++++++++++++++++++++++++++++++++++
> include/linux/input/gp2ap002a00f.h | 22 +++
> 4 files changed, 333 insertions(+), 0 deletions(-)
> create mode 100644 drivers/input/misc/gp2ap002a00f.c
> create mode 100644 include/linux/input/gp2ap002a00f.h
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index c9104bb..3c15c52 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -527,4 +527,14 @@ config INPUT_XEN_KBDDEV_FRONTEND
> To compile this driver as a module, choose M here: the
> module will be called xen-kbdfront.
>
> +config INPUT_GP2A
> + tristate "Sharp GP2AP002A00F I2C Proximity/Opto sensor driver"
> + depends on I2C
> + 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.
> +
> endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 299ad5e..361cf49 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -22,6 +22,7 @@ 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-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
> obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
> obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
> obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
> diff --git a/drivers/input/misc/gp2ap002a00f.c b/drivers/input/misc/gp2ap002a00f.c
> new file mode 100644
> index 0000000..73f866b
> --- /dev/null
> +++ b/drivers/input/misc/gp2ap002a00f.c
> @@ -0,0 +1,300 @@
> +/*
> + * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
> + *
> + * Author: Courtney Cavin <courtney.cavin@...yericsson.com>
> + * Prepared for up-stream by: Oskar Andero <oskar.andero@...yericsson.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 *device;
> + 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_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 __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 gp2a_report(struct gp2a_data *dt)
> +{
> + int vo = gpio_get_value(dt->pdata->vout_gpio);
> +
> + input_report_switch(dt->device, SW_FRONT_PROXIMITY, !vo);
> + input_sync(dt->device);
> +
> + 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_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(&dev->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(&dev->dev, "unable to deactivate, err %d\n", error);
> +}
> +
> +static int __devinit gp2a_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + const struct gp2a_platform_data *pdata;
> + struct gp2a_data *dt;
> + int error;
> +
> + pdata = client->dev.platform_data;
> + if (!pdata)
> + return -EINVAL;
> +
> + if (pdata->hw_setup) {
> + error = pdata->hw_setup(client);
> + if (error < 0)
> + return error;
> + }
> +
> + error = gpio_direction_input(pdata->vout_gpio);
> + if (error < 0)
> + goto err_hw_shutdown;
> +
> + dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
> + if (!dt) {
> + error = -ENOMEM;
> + goto err_hw_shutdown;
> + }
> +
> + dt->pdata = pdata;
> + dt->i2c_client = client;
> + i2c_set_clientdata(client, dt);
> +
> + error = gp2a_initialize(dt);
> + if (error < 0)
> + goto err_free_mem;
> +
> + dt->device = input_allocate_device();
> + if (!dt->device) {
> + error = -ENOMEM;
> + goto err_free_mem;
> + }
> + input_set_drvdata(dt->device, dt);
> +
> + dt->device->open = gp2a_device_open;
> + dt->device->close = gp2a_device_close;
> + dt->device->name = GP2A_I2C_NAME;
> + dt->device->id.bustype = BUS_I2C;
> +
> + input_set_capability(dt->device, 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(&dt->device->dev, "irq request failed\n");
> + goto err_free_input_dev;
> + }
> +
> + error = input_register_device(dt->device);
> + if (error) {
> + dev_err(&dt->device->dev, "device registration failed\n");
> + input_free_device(dt->device);
Here you end up trying to free input device twice.
> + goto err_free_irq;
> + }
> +
> + device_init_wakeup(&client->dev, pdata->wakeup);
> +
> + return 0;
> +
> +err_free_irq:
> + free_irq(client->irq, dt);
> +err_free_input_dev:
> + input_free_device(dt->device);
> +err_free_mem:
> + kfree(dt);
> +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);
> +
> + device_init_wakeup(&client->dev, false);
> +
> + free_irq(client->irq, dt);
> + input_unregister_device(dt->device);
> + if (dt->pdata->hw_shutdown)
> + dt->pdata->hw_shutdown(client);
> + kfree(dt);
> +
> + 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 error;
> +
> + mutex_lock(&dt->device->mutex);
> +
> + if (dt->device->users) {
> + if (device_may_wakeup(&client->dev)) {
> + enable_irq_wake(client->irq);
I think this part should happen regardless of whether device has users,
only non wakeup source case needs it.
> + } else {
> + error = gp2a_disable(dt);
> + if (error < 0)
> + return error;
> + }
> + }
> +
> + mutex_unlock(&dt->device->mutex);
> +
> + return 0;
> +}
> +
> +static int gp2a_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct gp2a_data *dt = i2c_get_clientdata(client);
> + int error;
> +
> + mutex_lock(&dt->device->mutex);
> +
> + if (dt->device->users) {
> + if (device_may_wakeup(&client->dev)) {
> + disable_irq_wake(client->irq);
> + } else {
> + error = gp2a_enable(dt);
> + if (error < 0)
> + return error;
> + }
> + }
> +
> + mutex_unlock(&dt->device->mutex);
> +
> + return 0;
> +}
> +#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@...yericsson.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 0000000..aad2fd4
> --- /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
> --
> 1.7.7
>
--
Dmitry
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