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Message-ID: <20111115125352.GA23767@caracas.corpusers.net>
Date: Tue, 15 Nov 2011 13:53:52 +0100
From: <oskar.andero@...yericsson.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
CC: "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"jic23@....ac.uk" <jic23@....ac.uk>,
"aghayal@...eaurora.org" <aghayal@...eaurora.org>,
"Cavin, Courtney" <Courtney.Cavin@...yericsson.com>
Subject: Re: [PATCH v3] input: add driver support for Sharp gp2ap002a00f
proximity sensor
On 10:43 Tue 15 Nov , Dmitry Torokhov wrote:
> 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.
Of course! Thanks!
> > + 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.
Hmm.. why would one want to enable irq_wake when there are no users?
Wouldn't this cause the device to wakeup at every irq and report an
switch event that no one listens to?
> > + } 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
> >
-Oskar
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