1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/input.h>
18 #include <linux/interrupt.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
21 #include <linux/log2.h>
24 #define PON_CNTL_1 0x1C
25 #define PON_CNTL_PULL_UP BIT(7)
26 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
29 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
30 * @key_press_irq: key press irq number
32 struct pmic8xxx_pwrkey
{
36 static irqreturn_t
pwrkey_press_irq(int irq
, void *_pwr
)
38 struct input_dev
*pwr
= _pwr
;
40 input_report_key(pwr
, KEY_POWER
, 1);
46 static irqreturn_t
pwrkey_release_irq(int irq
, void *_pwr
)
48 struct input_dev
*pwr
= _pwr
;
50 input_report_key(pwr
, KEY_POWER
, 0);
56 static int __maybe_unused
pmic8xxx_pwrkey_suspend(struct device
*dev
)
58 struct pmic8xxx_pwrkey
*pwrkey
= dev_get_drvdata(dev
);
60 if (device_may_wakeup(dev
))
61 enable_irq_wake(pwrkey
->key_press_irq
);
66 static int __maybe_unused
pmic8xxx_pwrkey_resume(struct device
*dev
)
68 struct pmic8xxx_pwrkey
*pwrkey
= dev_get_drvdata(dev
);
70 if (device_may_wakeup(dev
))
71 disable_irq_wake(pwrkey
->key_press_irq
);
76 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops
,
77 pmic8xxx_pwrkey_suspend
, pmic8xxx_pwrkey_resume
);
79 static int pmic8xxx_pwrkey_probe(struct platform_device
*pdev
)
81 struct input_dev
*pwr
;
82 int key_release_irq
= platform_get_irq(pdev
, 0);
83 int key_press_irq
= platform_get_irq(pdev
, 1);
86 unsigned int pon_cntl
;
87 struct regmap
*regmap
;
88 struct pmic8xxx_pwrkey
*pwrkey
;
92 if (of_property_read_u32(pdev
->dev
.of_node
, "debounce", &kpd_delay
))
95 if (kpd_delay
> 62500 || kpd_delay
== 0) {
96 dev_err(&pdev
->dev
, "invalid power key trigger delay\n");
100 pull_up
= of_property_read_bool(pdev
->dev
.of_node
, "pull-up");
102 regmap
= dev_get_regmap(pdev
->dev
.parent
, NULL
);
104 dev_err(&pdev
->dev
, "failed to locate regmap for the device\n");
108 pwrkey
= devm_kzalloc(&pdev
->dev
, sizeof(*pwrkey
), GFP_KERNEL
);
112 pwrkey
->key_press_irq
= key_press_irq
;
114 pwr
= devm_input_allocate_device(&pdev
->dev
);
116 dev_dbg(&pdev
->dev
, "Can't allocate power button\n");
120 input_set_capability(pwr
, EV_KEY
, KEY_POWER
);
122 pwr
->name
= "pmic8xxx_pwrkey";
123 pwr
->phys
= "pmic8xxx_pwrkey/input0";
125 delay
= (kpd_delay
<< 10) / USEC_PER_SEC
;
126 delay
= 1 + ilog2(delay
);
128 err
= regmap_read(regmap
, PON_CNTL_1
, &pon_cntl
);
130 dev_err(&pdev
->dev
, "failed reading PON_CNTL_1 err=%d\n", err
);
134 pon_cntl
&= ~PON_CNTL_TRIG_DELAY_MASK
;
135 pon_cntl
|= (delay
& PON_CNTL_TRIG_DELAY_MASK
);
137 pon_cntl
|= PON_CNTL_PULL_UP
;
139 pon_cntl
&= ~PON_CNTL_PULL_UP
;
141 err
= regmap_write(regmap
, PON_CNTL_1
, pon_cntl
);
143 dev_err(&pdev
->dev
, "failed writing PON_CNTL_1 err=%d\n", err
);
147 err
= devm_request_irq(&pdev
->dev
, key_press_irq
, pwrkey_press_irq
,
149 "pmic8xxx_pwrkey_press", pwr
);
151 dev_err(&pdev
->dev
, "Can't get %d IRQ for pwrkey: %d\n",
156 err
= devm_request_irq(&pdev
->dev
, key_release_irq
, pwrkey_release_irq
,
158 "pmic8xxx_pwrkey_release", pwr
);
160 dev_err(&pdev
->dev
, "Can't get %d IRQ for pwrkey: %d\n",
161 key_release_irq
, err
);
165 err
= input_register_device(pwr
);
167 dev_err(&pdev
->dev
, "Can't register power key: %d\n", err
);
171 platform_set_drvdata(pdev
, pwrkey
);
172 device_init_wakeup(&pdev
->dev
, 1);
177 static int pmic8xxx_pwrkey_remove(struct platform_device
*pdev
)
179 device_init_wakeup(&pdev
->dev
, 0);
184 static const struct of_device_id pm8xxx_pwr_key_id_table
[] = {
185 { .compatible
= "qcom,pm8058-pwrkey" },
186 { .compatible
= "qcom,pm8921-pwrkey" },
189 MODULE_DEVICE_TABLE(of
, pm8xxx_pwr_key_id_table
);
191 static struct platform_driver pmic8xxx_pwrkey_driver
= {
192 .probe
= pmic8xxx_pwrkey_probe
,
193 .remove
= pmic8xxx_pwrkey_remove
,
195 .name
= "pm8xxx-pwrkey",
196 .owner
= THIS_MODULE
,
197 .pm
= &pm8xxx_pwr_key_pm_ops
,
198 .of_match_table
= pm8xxx_pwr_key_id_table
,
201 module_platform_driver(pmic8xxx_pwrkey_driver
);
203 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
204 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
205 MODULE_LICENSE("GPL v2");
206 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");