forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
173 lines
4.6 KiB
173 lines
4.6 KiB
/** |
|
* MAX8925 ONKEY driver |
|
* |
|
* Copyright (C) 2009 Marvell International Ltd. |
|
* Haojian Zhuang <[email protected]> |
|
* |
|
* 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 <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|