xref: /linux/drivers/input/misc/max8925_onkey.c (revision cdc780f044a803aff8845b949f800f0f3d095d5f)
1a88638c4SRandy Dunlap /*
2104a5f3cSDmitry Torokhov  * MAX8925 ONKEY driver
33734574cSHaojian Zhuang  *
43734574cSHaojian Zhuang  * Copyright (C) 2009 Marvell International Ltd.
53734574cSHaojian Zhuang  *      Haojian Zhuang <haojian.zhuang@marvell.com>
63734574cSHaojian Zhuang  *
73734574cSHaojian Zhuang  * This file is subject to the terms and conditions of the GNU General
83734574cSHaojian Zhuang  * Public License. See the file "COPYING" in the main directory of this
93734574cSHaojian Zhuang  * archive for more details.
103734574cSHaojian Zhuang  *
113734574cSHaojian Zhuang  * This program is distributed in the hope that it will be useful,
123734574cSHaojian Zhuang  * but WITHOUT ANY WARRANTY; without even the implied warranty of
133734574cSHaojian Zhuang  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
143734574cSHaojian Zhuang  * GNU General Public License for more details.
153734574cSHaojian Zhuang  *
163734574cSHaojian Zhuang  * You should have received a copy of the GNU General Public License
173734574cSHaojian Zhuang  * along with this program; if not, write to the Free Software
183734574cSHaojian Zhuang  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
193734574cSHaojian Zhuang  */
203734574cSHaojian Zhuang 
213734574cSHaojian Zhuang #include <linux/kernel.h>
223734574cSHaojian Zhuang #include <linux/module.h>
233734574cSHaojian Zhuang #include <linux/platform_device.h>
243734574cSHaojian Zhuang #include <linux/i2c.h>
253734574cSHaojian Zhuang #include <linux/input.h>
263734574cSHaojian Zhuang #include <linux/interrupt.h>
273734574cSHaojian Zhuang #include <linux/mfd/max8925.h>
283734574cSHaojian Zhuang #include <linux/slab.h>
2904115e41SHimangi Saraogi #include <linux/device.h>
303734574cSHaojian Zhuang 
312d95ae3bSHaojian Zhuang #define SW_INPUT		(1 << 7)	/* 0/1 -- up/down */
323734574cSHaojian Zhuang #define HARDRESET_EN		(1 << 7)
333734574cSHaojian Zhuang #define PWREN_EN		(1 << 7)
343734574cSHaojian Zhuang 
353734574cSHaojian Zhuang struct max8925_onkey_info {
363734574cSHaojian Zhuang 	struct input_dev	*idev;
373734574cSHaojian Zhuang 	struct i2c_client	*i2c;
382d95ae3bSHaojian Zhuang 	struct device		*dev;
39104a5f3cSDmitry Torokhov 	unsigned int		irq[2];
403734574cSHaojian Zhuang };
413734574cSHaojian Zhuang 
423734574cSHaojian Zhuang /*
432d95ae3bSHaojian Zhuang  * MAX8925 gives us an interrupt when ONKEY is pressed or released.
443734574cSHaojian Zhuang  * max8925_set_bits() operates I2C bus and may sleep. So implement
453734574cSHaojian Zhuang  * it in thread IRQ handler.
463734574cSHaojian Zhuang  */
max8925_onkey_handler(int irq,void * data)473734574cSHaojian Zhuang static irqreturn_t max8925_onkey_handler(int irq, void *data)
483734574cSHaojian Zhuang {
493734574cSHaojian Zhuang 	struct max8925_onkey_info *info = data;
50104a5f3cSDmitry Torokhov 	int state;
513734574cSHaojian Zhuang 
52104a5f3cSDmitry Torokhov 	state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
53104a5f3cSDmitry Torokhov 
54104a5f3cSDmitry Torokhov 	input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
553734574cSHaojian Zhuang 	input_sync(info->idev);
563734574cSHaojian Zhuang 
57104a5f3cSDmitry Torokhov 	dev_dbg(info->dev, "onkey state:%d\n", state);
582d95ae3bSHaojian Zhuang 
593734574cSHaojian Zhuang 	/* Enable hardreset to halt if system isn't shutdown on time */
603734574cSHaojian Zhuang 	max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
613734574cSHaojian Zhuang 			 HARDRESET_EN, HARDRESET_EN);
623734574cSHaojian Zhuang 
633734574cSHaojian Zhuang 	return IRQ_HANDLED;
643734574cSHaojian Zhuang }
653734574cSHaojian Zhuang 
max8925_onkey_probe(struct platform_device * pdev)665298cc4cSBill Pemberton static int max8925_onkey_probe(struct platform_device *pdev)
673734574cSHaojian Zhuang {
683734574cSHaojian Zhuang 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
693734574cSHaojian Zhuang 	struct max8925_onkey_info *info;
70104a5f3cSDmitry Torokhov 	struct input_dev *input;
712d95ae3bSHaojian Zhuang 	int irq[2], error;
722d95ae3bSHaojian Zhuang 
732d95ae3bSHaojian Zhuang 	irq[0] = platform_get_irq(pdev, 0);
740bec8b7eSStephen Boyd 	if (irq[0] < 0)
752d95ae3bSHaojian Zhuang 		return -EINVAL;
76104a5f3cSDmitry Torokhov 
772d95ae3bSHaojian Zhuang 	irq[1] = platform_get_irq(pdev, 1);
780bec8b7eSStephen Boyd 	if (irq[1] < 0)
792d95ae3bSHaojian Zhuang 		return -EINVAL;
803734574cSHaojian Zhuang 
8104115e41SHimangi Saraogi 	info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
8204115e41SHimangi Saraogi 			    GFP_KERNEL);
8304115e41SHimangi Saraogi 	if (!info)
8404115e41SHimangi Saraogi 		return -ENOMEM;
8504115e41SHimangi Saraogi 
8604115e41SHimangi Saraogi 	input = devm_input_allocate_device(&pdev->dev);
8704115e41SHimangi Saraogi 	if (!input)
8804115e41SHimangi Saraogi 		return -ENOMEM;
893734574cSHaojian Zhuang 
90104a5f3cSDmitry Torokhov 	info->idev = input;
913734574cSHaojian Zhuang 	info->i2c = chip->i2c;
922d95ae3bSHaojian Zhuang 	info->dev = &pdev->dev;
93104a5f3cSDmitry Torokhov 	info->irq[0] = irq[0];
94104a5f3cSDmitry Torokhov 	info->irq[1] = irq[1];
95104a5f3cSDmitry Torokhov 
96104a5f3cSDmitry Torokhov 	input->name = "max8925_on";
97104a5f3cSDmitry Torokhov 	input->phys = "max8925_on/input0";
98104a5f3cSDmitry Torokhov 	input->id.bustype = BUS_I2C;
99104a5f3cSDmitry Torokhov 	input->dev.parent = &pdev->dev;
100104a5f3cSDmitry Torokhov 	input_set_capability(input, EV_KEY, KEY_POWER);
101104a5f3cSDmitry Torokhov 
10204115e41SHimangi Saraogi 	error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
10304115e41SHimangi Saraogi 					  max8925_onkey_handler, IRQF_ONESHOT,
10404115e41SHimangi Saraogi 					  "onkey-down", info);
1052d95ae3bSHaojian Zhuang 	if (error < 0) {
1062d95ae3bSHaojian Zhuang 		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
1072d95ae3bSHaojian Zhuang 			irq[0], error);
10804115e41SHimangi Saraogi 		return error;
1092d95ae3bSHaojian Zhuang 	}
110104a5f3cSDmitry Torokhov 
11104115e41SHimangi Saraogi 	error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
11204115e41SHimangi Saraogi 					  max8925_onkey_handler, IRQF_ONESHOT,
11304115e41SHimangi Saraogi 					  "onkey-up", info);
1142d95ae3bSHaojian Zhuang 	if (error < 0) {
1152d95ae3bSHaojian Zhuang 		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
1162d95ae3bSHaojian Zhuang 			irq[1], error);
11704115e41SHimangi Saraogi 		return error;
1182d95ae3bSHaojian Zhuang 	}
1193734574cSHaojian Zhuang 
1203734574cSHaojian Zhuang 	error = input_register_device(info->idev);
1213734574cSHaojian Zhuang 	if (error) {
1223734574cSHaojian Zhuang 		dev_err(chip->dev, "Can't register input device: %d\n", error);
12304115e41SHimangi Saraogi 		return error;
1243734574cSHaojian Zhuang 	}
1253734574cSHaojian Zhuang 
1263734574cSHaojian Zhuang 	platform_set_drvdata(pdev, info);
127104a5f3cSDmitry Torokhov 	device_init_wakeup(&pdev->dev, 1);
1283734574cSHaojian Zhuang 
1293734574cSHaojian Zhuang 	return 0;
1303734574cSHaojian Zhuang }
1313734574cSHaojian Zhuang 
max8925_onkey_suspend(struct device * dev)132*1bf94844SJonathan Cameron static int max8925_onkey_suspend(struct device *dev)
133adab30d7SKevin Liu {
134adab30d7SKevin Liu 	struct platform_device *pdev = to_platform_device(dev);
135adab30d7SKevin Liu 	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
136adab30d7SKevin Liu 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
137adab30d7SKevin Liu 
138adab30d7SKevin Liu 	if (device_may_wakeup(dev)) {
139104a5f3cSDmitry Torokhov 		chip->wakeup_flag |= 1 << info->irq[0];
140104a5f3cSDmitry Torokhov 		chip->wakeup_flag |= 1 << info->irq[1];
141adab30d7SKevin Liu 	}
142adab30d7SKevin Liu 
143adab30d7SKevin Liu 	return 0;
144adab30d7SKevin Liu }
145adab30d7SKevin Liu 
max8925_onkey_resume(struct device * dev)146*1bf94844SJonathan Cameron static int max8925_onkey_resume(struct device *dev)
147adab30d7SKevin Liu {
148adab30d7SKevin Liu 	struct platform_device *pdev = to_platform_device(dev);
149adab30d7SKevin Liu 	struct max8925_onkey_info *info = platform_get_drvdata(pdev);
150adab30d7SKevin Liu 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
151adab30d7SKevin Liu 
152adab30d7SKevin Liu 	if (device_may_wakeup(dev)) {
153104a5f3cSDmitry Torokhov 		chip->wakeup_flag &= ~(1 << info->irq[0]);
154104a5f3cSDmitry Torokhov 		chip->wakeup_flag &= ~(1 << info->irq[1]);
155adab30d7SKevin Liu 	}
156adab30d7SKevin Liu 
157adab30d7SKevin Liu 	return 0;
158adab30d7SKevin Liu }
159adab30d7SKevin Liu 
160*1bf94844SJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops,
161*1bf94844SJonathan Cameron 				max8925_onkey_suspend, max8925_onkey_resume);
162adab30d7SKevin Liu 
1633734574cSHaojian Zhuang static struct platform_driver max8925_onkey_driver = {
1643734574cSHaojian Zhuang 	.driver		= {
1653734574cSHaojian Zhuang 		.name	= "max8925-onkey",
166*1bf94844SJonathan Cameron 		.pm	= pm_sleep_ptr(&max8925_onkey_pm_ops),
1673734574cSHaojian Zhuang 	},
1683734574cSHaojian Zhuang 	.probe		= max8925_onkey_probe,
1693734574cSHaojian Zhuang };
170840a746bSJJ Ding module_platform_driver(max8925_onkey_driver);
1713734574cSHaojian Zhuang 
1723734574cSHaojian Zhuang MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
1733734574cSHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
1743734574cSHaojian Zhuang MODULE_LICENSE("GPL");
175