diff options
Diffstat (limited to 'drivers/input/misc/max8925_onkey.c')
| -rw-r--r-- | drivers/input/misc/max8925_onkey.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/input/misc/max8925_onkey.c b/drivers/input/misc/max8925_onkey.c new file mode 100644 index 000000000000..80af44608018 --- /dev/null +++ b/drivers/input/misc/max8925_onkey.c @@ -0,0 +1,148 @@ +/** + * max8925_onkey.c - MAX8925 ONKEY driver + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang <haojian.zhuang@marvell.com> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/mfd/max8925.h> +#include <linux/slab.h> + +#define HARDRESET_EN (1 << 7) +#define PWREN_EN (1 << 7) + +struct max8925_onkey_info { + struct input_dev *idev; + struct i2c_client *i2c; + int irq; +}; + +/* + * MAX8925 gives us an interrupt when ONKEY is held for 3 seconds. + * max8925_set_bits() operates I2C bus and may sleep. So implement + * it in thread IRQ handler. + */ +static irqreturn_t max8925_onkey_handler(int irq, void *data) +{ + struct max8925_onkey_info *info = data; + + input_report_key(info->idev, KEY_POWER, 1); + input_sync(info->idev); + + /* Enable hardreset to halt if system isn't shutdown on time */ + max8925_set_bits(info->i2c, MAX8925_SYSENSEL, + HARDRESET_EN, HARDRESET_EN); + + return IRQ_HANDLED; +} + +static int __devinit max8925_onkey_probe(struct platform_device *pdev) +{ + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct max8925_onkey_info *info; + int error; + + info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->i2c = chip->i2c; + info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC; + + info->idev = input_allocate_device(); + if (!info->idev) { + dev_err(chip->dev, "Failed to allocate input dev\n"); + error = -ENOMEM; + goto out_input; + } + + info->idev->name = "max8925_on"; + info->idev->phys = "max8925_on/input0"; + info->idev->id.bustype = BUS_I2C; + info->idev->dev.parent = &pdev->dev; + info->idev->evbit[0] = BIT_MASK(EV_KEY); + info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER); + + error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler, + IRQF_ONESHOT, "onkey", info); + if (error < 0) { + dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", + info->irq, error); + goto out_irq; + } + + error = input_register_device(info->idev); + if (error) { + dev_err(chip->dev, "Can't register input device: %d\n", error); + goto out; + } + + platform_set_drvdata(pdev, info); + + return 0; + +out: + free_irq(info->irq, info); +out_irq: + input_free_device(info->idev); +out_input: + kfree(info); + return error; +} + +static int __devexit max8925_onkey_remove(struct platform_device *pdev) +{ + struct max8925_onkey_info *info = platform_get_drvdata(pdev); + + free_irq(info->irq, info); + input_unregister_device(info->idev); + kfree(info); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver max8925_onkey_driver = { + .driver = { + .name = "max8925-onkey", + .owner = THIS_MODULE, + }, + .probe = max8925_onkey_probe, + .remove = __devexit_p(max8925_onkey_remove), +}; + +static int __init max8925_onkey_init(void) +{ + return platform_driver_register(&max8925_onkey_driver); +} +module_init(max8925_onkey_init); + +static void __exit max8925_onkey_exit(void) +{ + platform_driver_unregister(&max8925_onkey_driver); +} +module_exit(max8925_onkey_exit); + +MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); +MODULE_LICENSE("GPL"); |