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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 static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
 57 {
 58         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 59 
 60         if (device_may_wakeup(dev))
 61                 enable_irq_wake(pwrkey->key_press_irq);
 62 
 63         return 0;
 64 }
 65 
 66 static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
 67 {
 68         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 69 
 70         if (device_may_wakeup(dev))
 71                 disable_irq_wake(pwrkey->key_press_irq);
 72 
 73         return 0;
 74 }
 75 
 76 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
 77                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
 78 
 79 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
 80 {
 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);
 84         int err;
 85         unsigned int delay;
 86         unsigned int pon_cntl;
 87         struct regmap *regmap;
 88         struct pmic8xxx_pwrkey *pwrkey;
 89         u32 kpd_delay;
 90         bool pull_up;
 91 
 92         if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
 93                 kpd_delay = 15625;
 94 
 95         if (kpd_delay > 62500 || kpd_delay == 0) {
 96                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 97                 return -EINVAL;
 98         }
 99 
100         pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
101 
102         regmap = dev_get_regmap(pdev->dev.parent, NULL);
103         if (!regmap) {
104                 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
105                 return -ENODEV;
106         }
107 
108         pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
109         if (!pwrkey)
110                 return -ENOMEM;
111 
112         pwrkey->key_press_irq = key_press_irq;
113 
114         pwr = devm_input_allocate_device(&pdev->dev);
115         if (!pwr) {
116                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
117                 return -ENOMEM;
118         }
119 
120         input_set_capability(pwr, EV_KEY, KEY_POWER);
121 
122         pwr->name = "pmic8xxx_pwrkey";
123         pwr->phys = "pmic8xxx_pwrkey/input0";
124 
125         delay = (kpd_delay << 10) / USEC_PER_SEC;
126         delay = 1 + ilog2(delay);
127 
128         err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
129         if (err < 0) {
130                 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
131                 return err;
132         }
133 
134         pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
135         pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
136         if (pull_up)
137                 pon_cntl |= PON_CNTL_PULL_UP;
138         else
139                 pon_cntl &= ~PON_CNTL_PULL_UP;
140 
141         err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
142         if (err < 0) {
143                 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
144                 return err;
145         }
146 
147         err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
148                                IRQF_TRIGGER_RISING,
149                                "pmic8xxx_pwrkey_press", pwr);
150         if (err) {
151                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
152                         key_press_irq, err);
153                 return err;
154         }
155 
156         err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
157                                IRQF_TRIGGER_RISING,
158                                "pmic8xxx_pwrkey_release", pwr);
159         if (err) {
160                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
161                         key_release_irq, err);
162                 return err;
163         }
164 
165         err = input_register_device(pwr);
166         if (err) {
167                 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
168                 return err;
169         }
170 
171         platform_set_drvdata(pdev, pwrkey);
172         device_init_wakeup(&pdev->dev, 1);
173 
174         return 0;
175 }
176 
177 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
178 {
179         device_init_wakeup(&pdev->dev, 0);
180 
181         return 0;
182 }
183 
184 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
185         { .compatible = "qcom,pm8058-pwrkey" },
186         { .compatible = "qcom,pm8921-pwrkey" },
187         { }
188 };
189 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
190 
191 static struct platform_driver pmic8xxx_pwrkey_driver = {
192         .probe          = pmic8xxx_pwrkey_probe,
193         .remove         = pmic8xxx_pwrkey_remove,
194         .driver         = {
195                 .name   = "pm8xxx-pwrkey",
196                 .pm     = &pm8xxx_pwr_key_pm_ops,
197                 .of_match_table = pm8xxx_pwr_key_id_table,
198         },
199 };
200 module_platform_driver(pmic8xxx_pwrkey_driver);
201 
202 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
203 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
204 MODULE_LICENSE("GPL v2");
205 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
206 

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