1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
2 *
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.
6 *
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.
11 */
12
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>
22 #include <linux/of.h>
23
24 #define PON_CNTL_1 0x1C
25 #define PON_CNTL_PULL_UP BIT(7)
26 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
27
28 /**
29 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
30 * @key_press_irq: key press irq number
31 */
32 struct pmic8xxx_pwrkey {
33 int key_press_irq;
34 };
35
pwrkey_press_irq(int irq,void * _pwr)36 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
37 {
38 struct input_dev *pwr = _pwr;
39
40 input_report_key(pwr, KEY_POWER, 1);
41 input_sync(pwr);
42
43 return IRQ_HANDLED;
44 }
45
pwrkey_release_irq(int irq,void * _pwr)46 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
47 {
48 struct input_dev *pwr = _pwr;
49
50 input_report_key(pwr, KEY_POWER, 0);
51 input_sync(pwr);
52
53 return IRQ_HANDLED;
54 }
55
56 #ifdef CONFIG_PM_SLEEP
pmic8xxx_pwrkey_suspend(struct device * dev)57 static int pmic8xxx_pwrkey_suspend(struct device *dev)
58 {
59 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
60
61 if (device_may_wakeup(dev))
62 enable_irq_wake(pwrkey->key_press_irq);
63
64 return 0;
65 }
66
pmic8xxx_pwrkey_resume(struct device * dev)67 static int pmic8xxx_pwrkey_resume(struct device *dev)
68 {
69 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
70
71 if (device_may_wakeup(dev))
72 disable_irq_wake(pwrkey->key_press_irq);
73
74 return 0;
75 }
76 #endif
77
78 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
79 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
80
pmic8xxx_pwrkey_probe(struct platform_device * pdev)81 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
82 {
83 struct input_dev *pwr;
84 int key_release_irq = platform_get_irq(pdev, 0);
85 int key_press_irq = platform_get_irq(pdev, 1);
86 int err;
87 unsigned int delay;
88 unsigned int pon_cntl;
89 struct regmap *regmap;
90 struct pmic8xxx_pwrkey *pwrkey;
91 u32 kpd_delay;
92 bool pull_up;
93
94 if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
95 kpd_delay = 15625;
96
97 /* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
98 if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
99 dev_err(&pdev->dev, "invalid power key trigger delay\n");
100 return -EINVAL;
101 }
102
103 pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
104
105 regmap = dev_get_regmap(pdev->dev.parent, NULL);
106 if (!regmap) {
107 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
108 return -ENODEV;
109 }
110
111 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
112 if (!pwrkey)
113 return -ENOMEM;
114
115 pwrkey->key_press_irq = key_press_irq;
116
117 pwr = devm_input_allocate_device(&pdev->dev);
118 if (!pwr) {
119 dev_dbg(&pdev->dev, "Can't allocate power button\n");
120 return -ENOMEM;
121 }
122
123 input_set_capability(pwr, EV_KEY, KEY_POWER);
124
125 pwr->name = "pmic8xxx_pwrkey";
126 pwr->phys = "pmic8xxx_pwrkey/input0";
127
128 delay = (kpd_delay << 6) / USEC_PER_SEC;
129 delay = ilog2(delay);
130
131 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
132 if (err < 0) {
133 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
134 return err;
135 }
136
137 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
138 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
139 if (pull_up)
140 pon_cntl |= PON_CNTL_PULL_UP;
141 else
142 pon_cntl &= ~PON_CNTL_PULL_UP;
143
144 err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
145 if (err < 0) {
146 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
147 return err;
148 }
149
150 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
151 IRQF_TRIGGER_RISING,
152 "pmic8xxx_pwrkey_press", pwr);
153 if (err) {
154 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
155 key_press_irq, err);
156 return err;
157 }
158
159 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
160 IRQF_TRIGGER_RISING,
161 "pmic8xxx_pwrkey_release", pwr);
162 if (err) {
163 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
164 key_release_irq, err);
165 return err;
166 }
167
168 err = input_register_device(pwr);
169 if (err) {
170 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
171 return err;
172 }
173
174 platform_set_drvdata(pdev, pwrkey);
175 device_init_wakeup(&pdev->dev, 1);
176
177 return 0;
178 }
179
pmic8xxx_pwrkey_remove(struct platform_device * pdev)180 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
181 {
182 device_init_wakeup(&pdev->dev, 0);
183
184 return 0;
185 }
186
187 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
188 { .compatible = "qcom,pm8058-pwrkey" },
189 { .compatible = "qcom,pm8921-pwrkey" },
190 { }
191 };
192 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
193
194 static struct platform_driver pmic8xxx_pwrkey_driver = {
195 .probe = pmic8xxx_pwrkey_probe,
196 .remove = pmic8xxx_pwrkey_remove,
197 .driver = {
198 .name = "pm8xxx-pwrkey",
199 .owner = THIS_MODULE,
200 .pm = &pm8xxx_pwr_key_pm_ops,
201 .of_match_table = pm8xxx_pwr_key_id_table,
202 },
203 };
204 module_platform_driver(pmic8xxx_pwrkey_driver);
205
206 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
207 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
208 MODULE_LICENSE("GPL v2");
209 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
210