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Linux/drivers/input/misc/pmic8xxx-pwrkey.c

  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 
 23 #include <linux/input/pmic8xxx-pwrkey.h>
 24 
 25 #define PON_CNTL_1 0x1C
 26 #define PON_CNTL_PULL_UP BIT(7)
 27 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
 28 
 29 /**
 30  * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
 31  * @key_press_irq: key press irq number
 32  */
 33 struct pmic8xxx_pwrkey {
 34         int key_press_irq;
 35 };
 36 
 37 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
 38 {
 39         struct input_dev *pwr = _pwr;
 40 
 41         input_report_key(pwr, KEY_POWER, 1);
 42         input_sync(pwr);
 43 
 44         return IRQ_HANDLED;
 45 }
 46 
 47 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
 48 {
 49         struct input_dev *pwr = _pwr;
 50 
 51         input_report_key(pwr, KEY_POWER, 0);
 52         input_sync(pwr);
 53 
 54         return IRQ_HANDLED;
 55 }
 56 
 57 #ifdef CONFIG_PM_SLEEP
 58 static int pmic8xxx_pwrkey_suspend(struct device *dev)
 59 {
 60         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 61 
 62         if (device_may_wakeup(dev))
 63                 enable_irq_wake(pwrkey->key_press_irq);
 64 
 65         return 0;
 66 }
 67 
 68 static int pmic8xxx_pwrkey_resume(struct device *dev)
 69 {
 70         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 71 
 72         if (device_may_wakeup(dev))
 73                 disable_irq_wake(pwrkey->key_press_irq);
 74 
 75         return 0;
 76 }
 77 #endif
 78 
 79 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
 80                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
 81 
 82 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
 83 {
 84         struct input_dev *pwr;
 85         int key_release_irq = platform_get_irq(pdev, 0);
 86         int key_press_irq = platform_get_irq(pdev, 1);
 87         int err;
 88         unsigned int delay;
 89         unsigned int pon_cntl;
 90         struct regmap *regmap;
 91         struct pmic8xxx_pwrkey *pwrkey;
 92         const struct pm8xxx_pwrkey_platform_data *pdata =
 93                                         dev_get_platdata(&pdev->dev);
 94 
 95         if (!pdata) {
 96                 dev_err(&pdev->dev, "power key platform data not supplied\n");
 97                 return -EINVAL;
 98         }
 99 
100         if (pdata->kpd_trigger_delay_us > 62500) {
101                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
102                 return -EINVAL;
103         }
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 = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
129         delay = 1 + 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 (pdata->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, pdata->wakeup);
176 
177         return 0;
178 }
179 
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 struct platform_driver pmic8xxx_pwrkey_driver = {
188         .probe          = pmic8xxx_pwrkey_probe,
189         .remove         = pmic8xxx_pwrkey_remove,
190         .driver         = {
191                 .name   = PM8XXX_PWRKEY_DEV_NAME,
192                 .owner  = THIS_MODULE,
193                 .pm     = &pm8xxx_pwr_key_pm_ops,
194         },
195 };
196 module_platform_driver(pmic8xxx_pwrkey_driver);
197 
198 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
199 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
200 MODULE_LICENSE("GPL v2");
201 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
202 

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