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 #ifdef CONFIG_PM_SLEEP
57 static int pmic8xxx_pwrkey_suspend(struct device *dev)
59 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
61 if (device_may_wakeup(dev))
62 enable_irq_wake(pwrkey->key_press_irq);
67 static int pmic8xxx_pwrkey_resume(struct device *dev)
69 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
71 if (device_may_wakeup(dev))
72 disable_irq_wake(pwrkey->key_press_irq);
78 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
79 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
81 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
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);
88 unsigned int pon_cntl;
89 struct regmap *regmap;
90 struct pmic8xxx_pwrkey *pwrkey;
94 if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
97 pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
99 if (kpd_delay > 62500) {
100 dev_err(&pdev->dev, "invalid power key trigger delay\n");
104 regmap = dev_get_regmap(pdev->dev.parent, NULL);
106 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
110 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
114 pwrkey->key_press_irq = key_press_irq;
116 pwr = devm_input_allocate_device(&pdev->dev);
118 dev_dbg(&pdev->dev, "Can't allocate power button\n");
122 input_set_capability(pwr, EV_KEY, KEY_POWER);
124 pwr->name = "pmic8xxx_pwrkey";
125 pwr->phys = "pmic8xxx_pwrkey/input0";
127 delay = (kpd_delay << 10) / USEC_PER_SEC;
128 delay = 1 + ilog2(delay);
130 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
132 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
136 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
137 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
139 pon_cntl |= PON_CNTL_PULL_UP;
141 pon_cntl &= ~PON_CNTL_PULL_UP;
143 err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
145 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
149 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
151 "pmic8xxx_pwrkey_press", pwr);
153 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
158 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
160 "pmic8xxx_pwrkey_release", pwr);
162 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
163 key_release_irq, err);
167 err = input_register_device(pwr);
169 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
173 platform_set_drvdata(pdev, pwrkey);
174 device_init_wakeup(&pdev->dev, 1);
179 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
181 device_init_wakeup(&pdev->dev, 0);
186 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
187 { .compatible = "qcom,pm8058-pwrkey" },
188 { .compatible = "qcom,pm8921-pwrkey" },
191 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
193 static struct platform_driver pmic8xxx_pwrkey_driver = {
194 .probe = pmic8xxx_pwrkey_probe,
195 .remove = pmic8xxx_pwrkey_remove,
197 .name = "pm8xxx-pwrkey",
198 .owner = THIS_MODULE,
199 .pm = &pm8xxx_pwr_key_pm_ops,
200 .of_match_table = pm8xxx_pwr_key_id_table,
203 module_platform_driver(pmic8xxx_pwrkey_driver);
205 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
206 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
207 MODULE_LICENSE("GPL v2");
208 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");