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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/input.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21#include <linux/log2.h>
22
23#include <linux/mfd/pm8xxx/core.h>
24#include <linux/input/pmic8xxx-pwrkey.h>
25
26#define PON_CNTL_1 0x1C
27#define PON_CNTL_PULL_UP BIT(7)
28#define PON_CNTL_TRIG_DELAY_MASK (0x7)
29
30
31
32
33
34struct pmic8xxx_pwrkey {
35 struct input_dev *pwr;
36 int key_press_irq;
37};
38
39static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
40{
41 struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
42
43 input_report_key(pwrkey->pwr, KEY_POWER, 1);
44 input_sync(pwrkey->pwr);
45
46 return IRQ_HANDLED;
47}
48
49static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
50{
51 struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
52
53 input_report_key(pwrkey->pwr, KEY_POWER, 0);
54 input_sync(pwrkey->pwr);
55
56 return IRQ_HANDLED;
57}
58
59#ifdef CONFIG_PM_SLEEP
60static int pmic8xxx_pwrkey_suspend(struct device *dev)
61{
62 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
63
64 if (device_may_wakeup(dev))
65 enable_irq_wake(pwrkey->key_press_irq);
66
67 return 0;
68}
69
70static int pmic8xxx_pwrkey_resume(struct device *dev)
71{
72 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
73
74 if (device_may_wakeup(dev))
75 disable_irq_wake(pwrkey->key_press_irq);
76
77 return 0;
78}
79#endif
80
81static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
82 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
83
84static int __devinit pmic8xxx_pwrkey_probe(struct platform_device *pdev)
85{
86 struct input_dev *pwr;
87 int key_release_irq = platform_get_irq(pdev, 0);
88 int key_press_irq = platform_get_irq(pdev, 1);
89 int err;
90 unsigned int delay;
91 u8 pon_cntl;
92 struct pmic8xxx_pwrkey *pwrkey;
93 const struct pm8xxx_pwrkey_platform_data *pdata =
94 dev_get_platdata(&pdev->dev);
95
96 if (!pdata) {
97 dev_err(&pdev->dev, "power key platform data not supplied\n");
98 return -EINVAL;
99 }
100
101 if (pdata->kpd_trigger_delay_us > 62500) {
102 dev_err(&pdev->dev, "invalid power key trigger delay\n");
103 return -EINVAL;
104 }
105
106 pwrkey = kzalloc(sizeof(*pwrkey), GFP_KERNEL);
107 if (!pwrkey)
108 return -ENOMEM;
109
110 pwr = input_allocate_device();
111 if (!pwr) {
112 dev_dbg(&pdev->dev, "Can't allocate power button\n");
113 err = -ENOMEM;
114 goto free_pwrkey;
115 }
116
117 input_set_capability(pwr, EV_KEY, KEY_POWER);
118
119 pwr->name = "pmic8xxx_pwrkey";
120 pwr->phys = "pmic8xxx_pwrkey/input0";
121 pwr->dev.parent = &pdev->dev;
122
123 delay = (pdata->kpd_trigger_delay_us << 10) / USEC_PER_SEC;
124 delay = 1 + ilog2(delay);
125
126 err = pm8xxx_readb(pdev->dev.parent, PON_CNTL_1, &pon_cntl);
127 if (err < 0) {
128 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
129 goto free_input_dev;
130 }
131
132 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
133 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
134 if (pdata->pull_up)
135 pon_cntl |= PON_CNTL_PULL_UP;
136 else
137 pon_cntl &= ~PON_CNTL_PULL_UP;
138
139 err = pm8xxx_writeb(pdev->dev.parent, PON_CNTL_1, pon_cntl);
140 if (err < 0) {
141 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
142 goto free_input_dev;
143 }
144
145 err = input_register_device(pwr);
146 if (err) {
147 dev_dbg(&pdev->dev, "Can't register power key: %d\n", err);
148 goto free_input_dev;
149 }
150
151 pwrkey->key_press_irq = key_press_irq;
152 pwrkey->pwr = pwr;
153
154 platform_set_drvdata(pdev, pwrkey);
155
156 err = request_irq(key_press_irq, pwrkey_press_irq,
157 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
158 if (err < 0) {
159 dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
160 key_press_irq, err);
161 goto unreg_input_dev;
162 }
163
164 err = request_irq(key_release_irq, pwrkey_release_irq,
165 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
166 if (err < 0) {
167 dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
168 key_release_irq, err);
169
170 goto free_press_irq;
171 }
172
173 device_init_wakeup(&pdev->dev, pdata->wakeup);
174
175 return 0;
176
177free_press_irq:
178 free_irq(key_press_irq, NULL);
179unreg_input_dev:
180 platform_set_drvdata(pdev, NULL);
181 input_unregister_device(pwr);
182 pwr = NULL;
183free_input_dev:
184 input_free_device(pwr);
185free_pwrkey:
186 kfree(pwrkey);
187 return err;
188}
189
190static int __devexit pmic8xxx_pwrkey_remove(struct platform_device *pdev)
191{
192 struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
193 int key_release_irq = platform_get_irq(pdev, 0);
194 int key_press_irq = platform_get_irq(pdev, 1);
195
196 device_init_wakeup(&pdev->dev, 0);
197
198 free_irq(key_press_irq, pwrkey);
199 free_irq(key_release_irq, pwrkey);
200 input_unregister_device(pwrkey->pwr);
201 platform_set_drvdata(pdev, NULL);
202 kfree(pwrkey);
203
204 return 0;
205}
206
207static struct platform_driver pmic8xxx_pwrkey_driver = {
208 .probe = pmic8xxx_pwrkey_probe,
209 .remove = __devexit_p(pmic8xxx_pwrkey_remove),
210 .driver = {
211 .name = PM8XXX_PWRKEY_DEV_NAME,
212 .owner = THIS_MODULE,
213 .pm = &pm8xxx_pwr_key_pm_ops,
214 },
215};
216
217static int __init pmic8xxx_pwrkey_init(void)
218{
219 return platform_driver_register(&pmic8xxx_pwrkey_driver);
220}
221module_init(pmic8xxx_pwrkey_init);
222
223static void __exit pmic8xxx_pwrkey_exit(void)
224{
225 platform_driver_unregister(&pmic8xxx_pwrkey_driver);
226}
227module_exit(pmic8xxx_pwrkey_exit);
228
229MODULE_ALIAS("platform:pmic8xxx_pwrkey");
230MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
231MODULE_LICENSE("GPL v2");
232MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
233
