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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 #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 
 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 
 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
 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 
 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 
 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         if (kpd_delay > 62500 || kpd_delay == 0) {
 98                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 99                 return -EINVAL;
100         }
101 
102         pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
103 
104         regmap = dev_get_regmap(pdev->dev.parent, NULL);
105         if (!regmap) {
106                 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
107                 return -ENODEV;
108         }
109 
110         pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
111         if (!pwrkey)
112                 return -ENOMEM;
113 
114         pwrkey->key_press_irq = key_press_irq;
115 
116         pwr = devm_input_allocate_device(&pdev->dev);
117         if (!pwr) {
118                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
119                 return -ENOMEM;
120         }
121 
122         input_set_capability(pwr, EV_KEY, KEY_POWER);
123 
124         pwr->name = "pmic8xxx_pwrkey";
125         pwr->phys = "pmic8xxx_pwrkey/input0";
126 
127         delay = (kpd_delay << 10) / USEC_PER_SEC;
128         delay = 1 + ilog2(delay);
129 
130         err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
131         if (err < 0) {
132                 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
133                 return err;
134         }
135 
136         pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
137         pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
138         if (pull_up)
139                 pon_cntl |= PON_CNTL_PULL_UP;
140         else
141                 pon_cntl &= ~PON_CNTL_PULL_UP;
142 
143         err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
144         if (err < 0) {
145                 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
146                 return err;
147         }
148 
149         err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
150                                IRQF_TRIGGER_RISING,
151                                "pmic8xxx_pwrkey_press", pwr);
152         if (err) {
153                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
154                         key_press_irq, err);
155                 return err;
156         }
157 
158         err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
159                                IRQF_TRIGGER_RISING,
160                                "pmic8xxx_pwrkey_release", pwr);
161         if (err) {
162                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
163                         key_release_irq, err);
164                 return err;
165         }
166 
167         err = input_register_device(pwr);
168         if (err) {
169                 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
170                 return err;
171         }
172 
173         platform_set_drvdata(pdev, pwrkey);
174         device_init_wakeup(&pdev->dev, 1);
175 
176         return 0;
177 }
178 
179 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
180 {
181         device_init_wakeup(&pdev->dev, 0);
182 
183         return 0;
184 }
185 
186 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
187         { .compatible = "qcom,pm8058-pwrkey" },
188         { .compatible = "qcom,pm8921-pwrkey" },
189         { }
190 };
191 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
192 
193 static struct platform_driver pmic8xxx_pwrkey_driver = {
194         .probe          = pmic8xxx_pwrkey_probe,
195         .remove         = pmic8xxx_pwrkey_remove,
196         .driver         = {
197                 .name   = "pm8xxx-pwrkey",
198                 .owner  = THIS_MODULE,
199                 .pm     = &pm8xxx_pwr_key_pm_ops,
200                 .of_match_table = pm8xxx_pwr_key_id_table,
201         },
202 };
203 module_platform_driver(pmic8xxx_pwrkey_driver);
204 
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>");
209 

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