diff options
Diffstat (limited to 'drivers/input/misc/max8925_onkey.c')
| -rw-r--r-- | drivers/input/misc/max8925_onkey.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/input/misc/max8925_onkey.c b/drivers/input/misc/max8925_onkey.c new file mode 100644 index 000000000..ffab4a490 --- /dev/null +++ b/drivers/input/misc/max8925_onkey.c @@ -0,0 +1,173 @@ +/** + * 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> +#include <linux/device.h> + +#define SW_INPUT (1 << 7) /* 0/1 -- up/down */ +#define HARDRESET_EN (1 << 7) +#define PWREN_EN (1 << 7) + +struct max8925_onkey_info { + struct input_dev *idev; + struct i2c_client *i2c; + struct device *dev; + unsigned int irq[2]; +}; + +/* + * MAX8925 gives us an interrupt when ONKEY is pressed or released. + * 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; + int state; + + state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); + + input_report_key(info->idev, KEY_POWER, state & SW_INPUT); + input_sync(info->idev); + + dev_dbg(info->dev, "onkey state:%d\n", state); + + /* 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 max8925_onkey_probe(struct platform_device *pdev) +{ + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct max8925_onkey_info *info; + struct input_dev *input; + int irq[2], error; + + irq[0] = platform_get_irq(pdev, 0); + if (irq[0] < 0) + return -EINVAL; + + irq[1] = platform_get_irq(pdev, 1); + if (irq[1] < 0) + return -EINVAL; + + info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + input = devm_input_allocate_device(&pdev->dev); + if (!input) + return -ENOMEM; + + info->idev = input; + info->i2c = chip->i2c; + info->dev = &pdev->dev; + info->irq[0] = irq[0]; + info->irq[1] = irq[1]; + + input->name = "max8925_on"; + input->phys = "max8925_on/input0"; + input->id.bustype = BUS_I2C; + input->dev.parent = &pdev->dev; + input_set_capability(input, EV_KEY, KEY_POWER); + + error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL, + max8925_onkey_handler, IRQF_ONESHOT, + "onkey-down", info); + if (error < 0) { + dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", + irq[0], error); + return error; + } + + error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL, + max8925_onkey_handler, IRQF_ONESHOT, + "onkey-up", info); + if (error < 0) { + dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", + irq[1], error); + return error; + } + + error = input_register_device(info->idev); + if (error) { + dev_err(chip->dev, "Can't register input device: %d\n", error); + return error; + } + + platform_set_drvdata(pdev, info); + device_init_wakeup(&pdev->dev, 1); + + return 0; +} + +static int __maybe_unused max8925_onkey_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct max8925_onkey_info *info = platform_get_drvdata(pdev); + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + + if (device_may_wakeup(dev)) { + chip->wakeup_flag |= 1 << info->irq[0]; + chip->wakeup_flag |= 1 << info->irq[1]; + } + + return 0; +} + +static int __maybe_unused max8925_onkey_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct max8925_onkey_info *info = platform_get_drvdata(pdev); + struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); + + if (device_may_wakeup(dev)) { + chip->wakeup_flag &= ~(1 << info->irq[0]); + chip->wakeup_flag &= ~(1 << info->irq[1]); + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); + +static struct platform_driver max8925_onkey_driver = { + .driver = { + .name = "max8925-onkey", + .pm = &max8925_onkey_pm_ops, + }, + .probe = max8925_onkey_probe, +}; +module_platform_driver(max8925_onkey_driver); + +MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); +MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); +MODULE_LICENSE("GPL"); |