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1 | /* |
2 | * Texas Instruments' Palmas Power Button Input Driver | |
3 | * | |
4 | * Copyright (C) 2012-2014 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * Girish S Ghongdemath | |
6 | * Nishanth Menon | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mfd/palmas.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #define PALMAS_LPK_TIME_MASK 0x0c | |
29 | #define PALMAS_PWRON_DEBOUNCE_MASK 0x03 | |
30 | #define PALMAS_PWR_KEY_Q_TIME_MS 20 | |
31 | ||
32 | /** | |
33 | * struct palmas_pwron - Palmas power on data | |
34 | * @palmas: pointer to palmas device | |
35 | * @input_dev: pointer to input device | |
36 | * @input_work: work for detecting release of key | |
37 | * @irq: irq that we are hooked on to | |
38 | */ | |
39 | struct palmas_pwron { | |
40 | struct palmas *palmas; | |
41 | struct input_dev *input_dev; | |
42 | struct delayed_work input_work; | |
43 | int irq; | |
44 | }; | |
45 | ||
46 | /** | |
47 | * struct palmas_pwron_config - configuration of palmas power on | |
48 | * @long_press_time_val: value for long press h/w shutdown event | |
49 | * @pwron_debounce_val: value for debounce of power button | |
50 | */ | |
51 | struct palmas_pwron_config { | |
52 | u8 long_press_time_val; | |
53 | u8 pwron_debounce_val; | |
54 | }; | |
55 | ||
56 | /** | |
57 | * palmas_power_button_work() - Detects the button release event | |
58 | * @work: work item to detect button release | |
59 | */ | |
60 | static void palmas_power_button_work(struct work_struct *work) | |
61 | { | |
62 | struct palmas_pwron *pwron = container_of(work, | |
63 | struct palmas_pwron, | |
64 | input_work.work); | |
65 | struct input_dev *input_dev = pwron->input_dev; | |
66 | unsigned int reg; | |
67 | int error; | |
68 | ||
69 | error = palmas_read(pwron->palmas, PALMAS_INTERRUPT_BASE, | |
70 | PALMAS_INT1_LINE_STATE, ®); | |
71 | if (error) { | |
72 | dev_err(input_dev->dev.parent, | |
73 | "Cannot read palmas PWRON status: %d\n", error); | |
74 | } else if (reg & BIT(1)) { | |
75 | /* The button is released, report event. */ | |
76 | input_report_key(input_dev, KEY_POWER, 0); | |
77 | input_sync(input_dev); | |
78 | } else { | |
79 | /* The button is still depressed, keep checking. */ | |
80 | schedule_delayed_work(&pwron->input_work, | |
81 | msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS)); | |
82 | } | |
83 | } | |
84 | ||
85 | /** | |
86 | * pwron_irq() - button press isr | |
87 | * @irq: irq | |
88 | * @palmas_pwron: pwron struct | |
89 | * | |
90 | * Return: IRQ_HANDLED | |
91 | */ | |
92 | static irqreturn_t pwron_irq(int irq, void *palmas_pwron) | |
93 | { | |
94 | struct palmas_pwron *pwron = palmas_pwron; | |
95 | struct input_dev *input_dev = pwron->input_dev; | |
96 | ||
97 | input_report_key(input_dev, KEY_POWER, 1); | |
98 | pm_wakeup_event(input_dev->dev.parent, 0); | |
99 | input_sync(input_dev); | |
100 | ||
101 | mod_delayed_work(system_wq, &pwron->input_work, | |
102 | msecs_to_jiffies(PALMAS_PWR_KEY_Q_TIME_MS)); | |
103 | ||
104 | return IRQ_HANDLED; | |
105 | } | |
106 | ||
107 | /** | |
108 | * palmas_pwron_params_ofinit() - device tree parameter parser | |
109 | * @dev: palmas button device | |
110 | * @config: configuration params that this fills up | |
111 | */ | |
112 | static void palmas_pwron_params_ofinit(struct device *dev, | |
113 | struct palmas_pwron_config *config) | |
114 | { | |
115 | struct device_node *np; | |
116 | u32 val; | |
117 | int i, error; | |
118 | u8 lpk_times[] = { 6, 8, 10, 12 }; | |
119 | int pwr_on_deb_ms[] = { 15, 100, 500, 1000 }; | |
120 | ||
121 | memset(config, 0, sizeof(*config)); | |
122 | ||
123 | /* Default config parameters */ | |
124 | config->long_press_time_val = ARRAY_SIZE(lpk_times) - 1; | |
125 | ||
126 | np = dev->of_node; | |
127 | if (!np) | |
128 | return; | |
129 | ||
130 | error = of_property_read_u32(np, "ti,palmas-long-press-seconds", &val); | |
131 | if (!error) { | |
132 | for (i = 0; i < ARRAY_SIZE(lpk_times); i++) { | |
133 | if (val <= lpk_times[i]) { | |
134 | config->long_press_time_val = i; | |
135 | break; | |
136 | } | |
137 | } | |
138 | } | |
139 | ||
140 | error = of_property_read_u32(np, | |
141 | "ti,palmas-pwron-debounce-milli-seconds", | |
142 | &val); | |
143 | if (!error) { | |
144 | for (i = 0; i < ARRAY_SIZE(pwr_on_deb_ms); i++) { | |
145 | if (val <= pwr_on_deb_ms[i]) { | |
146 | config->pwron_debounce_val = i; | |
147 | break; | |
148 | } | |
149 | } | |
150 | } | |
151 | ||
152 | dev_info(dev, "h/w controlled shutdown duration=%d seconds\n", | |
153 | lpk_times[config->long_press_time_val]); | |
154 | } | |
155 | ||
156 | /** | |
157 | * palmas_pwron_probe() - probe | |
158 | * @pdev: platform device for the button | |
159 | * | |
160 | * Return: 0 for successful probe else appropriate error | |
161 | */ | |
162 | static int palmas_pwron_probe(struct platform_device *pdev) | |
163 | { | |
164 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
165 | struct device *dev = &pdev->dev; | |
166 | struct input_dev *input_dev; | |
167 | struct palmas_pwron *pwron; | |
168 | struct palmas_pwron_config config; | |
169 | int val; | |
170 | int error; | |
171 | ||
172 | palmas_pwron_params_ofinit(dev, &config); | |
173 | ||
174 | pwron = kzalloc(sizeof(*pwron), GFP_KERNEL); | |
175 | if (!pwron) | |
176 | return -ENOMEM; | |
177 | ||
178 | input_dev = input_allocate_device(); | |
179 | if (!input_dev) { | |
180 | dev_err(dev, "Can't allocate power button\n"); | |
181 | error = -ENOMEM; | |
182 | goto err_free_mem; | |
183 | } | |
184 | ||
185 | input_dev->name = "palmas_pwron"; | |
186 | input_dev->phys = "palmas_pwron/input0"; | |
187 | input_dev->dev.parent = dev; | |
188 | ||
189 | input_set_capability(input_dev, EV_KEY, KEY_POWER); | |
190 | ||
191 | /* | |
192 | * Setup default hardware shutdown option (long key press) | |
193 | * and debounce. | |
194 | */ | |
195 | val = config.long_press_time_val << __ffs(PALMAS_LPK_TIME_MASK); | |
196 | val |= config.pwron_debounce_val << __ffs(PALMAS_PWRON_DEBOUNCE_MASK); | |
197 | error = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, | |
198 | PALMAS_LONG_PRESS_KEY, | |
199 | PALMAS_LPK_TIME_MASK | | |
200 | PALMAS_PWRON_DEBOUNCE_MASK, | |
201 | val); | |
202 | if (error) { | |
203 | dev_err(dev, "LONG_PRESS_KEY_UPDATE failed: %d\n", error); | |
204 | goto err_free_input; | |
205 | } | |
206 | ||
207 | pwron->palmas = palmas; | |
208 | pwron->input_dev = input_dev; | |
209 | ||
210 | INIT_DELAYED_WORK(&pwron->input_work, palmas_power_button_work); | |
211 | ||
212 | pwron->irq = platform_get_irq(pdev, 0); | |
213 | error = request_threaded_irq(pwron->irq, NULL, pwron_irq, | |
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214 | IRQF_TRIGGER_HIGH | |
215 | IRQF_TRIGGER_LOW | | |
216 | IRQF_ONESHOT, | |
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217 | dev_name(dev), pwron); |
218 | if (error) { | |
219 | dev_err(dev, "Can't get IRQ for pwron: %d\n", error); | |
220 | goto err_free_input; | |
221 | } | |
222 | ||
223 | error = input_register_device(input_dev); | |
224 | if (error) { | |
225 | dev_err(dev, "Can't register power button: %d\n", error); | |
226 | goto err_free_irq; | |
227 | } | |
228 | ||
229 | platform_set_drvdata(pdev, pwron); | |
230 | device_init_wakeup(dev, true); | |
231 | ||
232 | return 0; | |
233 | ||
234 | err_free_irq: | |
235 | cancel_delayed_work_sync(&pwron->input_work); | |
236 | free_irq(pwron->irq, pwron); | |
237 | err_free_input: | |
238 | input_free_device(input_dev); | |
239 | err_free_mem: | |
240 | kfree(pwron); | |
241 | return error; | |
242 | } | |
243 | ||
244 | /** | |
245 | * palmas_pwron_remove() - Cleanup on removal | |
246 | * @pdev: platform device for the button | |
247 | * | |
248 | * Return: 0 | |
249 | */ | |
250 | static int palmas_pwron_remove(struct platform_device *pdev) | |
251 | { | |
252 | struct palmas_pwron *pwron = platform_get_drvdata(pdev); | |
253 | ||
254 | free_irq(pwron->irq, pwron); | |
255 | cancel_delayed_work_sync(&pwron->input_work); | |
256 | ||
257 | input_unregister_device(pwron->input_dev); | |
258 | kfree(pwron); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
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263 | /** |
264 | * palmas_pwron_suspend() - suspend handler | |
265 | * @dev: power button device | |
266 | * | |
267 | * Cancel all pending work items for the power button, setup irq for wakeup | |
268 | * | |
269 | * Return: 0 | |
270 | */ | |
97a652a8 | 271 | static int __maybe_unused palmas_pwron_suspend(struct device *dev) |
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272 | { |
273 | struct platform_device *pdev = to_platform_device(dev); | |
274 | struct palmas_pwron *pwron = platform_get_drvdata(pdev); | |
275 | ||
276 | cancel_delayed_work_sync(&pwron->input_work); | |
277 | ||
278 | if (device_may_wakeup(dev)) | |
279 | enable_irq_wake(pwron->irq); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /** | |
285 | * palmas_pwron_resume() - resume handler | |
286 | * @dev: power button device | |
287 | * | |
288 | * Just disable the wakeup capability of irq here. | |
289 | * | |
290 | * Return: 0 | |
291 | */ | |
97a652a8 | 292 | static int __maybe_unused palmas_pwron_resume(struct device *dev) |
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293 | { |
294 | struct platform_device *pdev = to_platform_device(dev); | |
295 | struct palmas_pwron *pwron = platform_get_drvdata(pdev); | |
296 | ||
297 | if (device_may_wakeup(dev)) | |
298 | disable_irq_wake(pwron->irq); | |
299 | ||
300 | return 0; | |
301 | } | |
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302 | |
303 | static SIMPLE_DEV_PM_OPS(palmas_pwron_pm, | |
304 | palmas_pwron_suspend, palmas_pwron_resume); | |
305 | ||
306 | #ifdef CONFIG_OF | |
245165de | 307 | static const struct of_device_id of_palmas_pwr_match[] = { |
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308 | { .compatible = "ti,palmas-pwrbutton" }, |
309 | { }, | |
310 | }; | |
311 | ||
312 | MODULE_DEVICE_TABLE(of, of_palmas_pwr_match); | |
313 | #endif | |
314 | ||
315 | static struct platform_driver palmas_pwron_driver = { | |
316 | .probe = palmas_pwron_probe, | |
317 | .remove = palmas_pwron_remove, | |
318 | .driver = { | |
319 | .name = "palmas_pwrbutton", | |
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320 | .of_match_table = of_match_ptr(of_palmas_pwr_match), |
321 | .pm = &palmas_pwron_pm, | |
322 | }, | |
323 | }; | |
324 | module_platform_driver(palmas_pwron_driver); | |
325 | ||
326 | MODULE_ALIAS("platform:palmas-pwrbutton"); | |
327 | MODULE_DESCRIPTION("Palmas Power Button"); | |
05f7588c | 328 | MODULE_LICENSE("GPL v2"); |
adff5962 | 329 | MODULE_AUTHOR("Texas Instruments Inc."); |