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68c581d5 CC |
1 | /* |
2 | * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. | |
3 | * Copyright (c) 2014, Sony Mobile Communications Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 and | |
7 | * only version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/input.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/log2.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/reboot.h> | |
25 | #include <linux/regmap.h> | |
26 | ||
27 | #define PON_REV2 0x01 | |
28 | ||
29 | #define PON_RT_STS 0x10 | |
30 | #define PON_KPDPWR_N_SET BIT(0) | |
31 | ||
32 | #define PON_PS_HOLD_RST_CTL 0x5a | |
33 | #define PON_PS_HOLD_RST_CTL2 0x5b | |
34 | #define PON_PS_HOLD_ENABLE BIT(7) | |
35 | #define PON_PS_HOLD_TYPE_MASK 0x0f | |
36 | #define PON_PS_HOLD_TYPE_SHUTDOWN 4 | |
37 | #define PON_PS_HOLD_TYPE_HARD_RESET 7 | |
38 | ||
39 | #define PON_PULL_CTL 0x70 | |
40 | #define PON_KPDPWR_PULL_UP BIT(1) | |
41 | ||
42 | #define PON_DBC_CTL 0x71 | |
43 | #define PON_DBC_DELAY_MASK 0x7 | |
44 | ||
45 | ||
46 | struct pm8941_pwrkey { | |
47 | struct device *dev; | |
48 | int irq; | |
49 | u32 baseaddr; | |
50 | struct regmap *regmap; | |
51 | struct input_dev *input; | |
52 | ||
53 | unsigned int revision; | |
54 | struct notifier_block reboot_notifier; | |
55 | }; | |
56 | ||
57 | static int pm8941_reboot_notify(struct notifier_block *nb, | |
58 | unsigned long code, void *unused) | |
59 | { | |
60 | struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey, | |
61 | reboot_notifier); | |
62 | unsigned int enable_reg; | |
63 | unsigned int reset_type; | |
64 | int error; | |
65 | ||
66 | /* PMICs with revision 0 have the enable bit in same register as ctrl */ | |
67 | if (pwrkey->revision == 0) | |
68 | enable_reg = PON_PS_HOLD_RST_CTL; | |
69 | else | |
70 | enable_reg = PON_PS_HOLD_RST_CTL2; | |
71 | ||
72 | error = regmap_update_bits(pwrkey->regmap, | |
73 | pwrkey->baseaddr + enable_reg, | |
74 | PON_PS_HOLD_ENABLE, | |
75 | 0); | |
76 | if (error) | |
77 | dev_err(pwrkey->dev, | |
78 | "unable to clear ps hold reset enable: %d\n", | |
79 | error); | |
80 | ||
81 | /* | |
82 | * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between | |
83 | * writes. | |
84 | */ | |
85 | usleep_range(100, 1000); | |
86 | ||
87 | switch (code) { | |
88 | case SYS_HALT: | |
89 | case SYS_POWER_OFF: | |
90 | reset_type = PON_PS_HOLD_TYPE_SHUTDOWN; | |
91 | break; | |
92 | case SYS_RESTART: | |
93 | default: | |
94 | reset_type = PON_PS_HOLD_TYPE_HARD_RESET; | |
95 | break; | |
96 | }; | |
97 | ||
98 | error = regmap_update_bits(pwrkey->regmap, | |
99 | pwrkey->baseaddr + PON_PS_HOLD_RST_CTL, | |
100 | PON_PS_HOLD_TYPE_MASK, | |
101 | reset_type); | |
102 | if (error) | |
103 | dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n", | |
104 | error); | |
105 | ||
106 | error = regmap_update_bits(pwrkey->regmap, | |
107 | pwrkey->baseaddr + enable_reg, | |
108 | PON_PS_HOLD_ENABLE, | |
109 | PON_PS_HOLD_ENABLE); | |
110 | if (error) | |
111 | dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error); | |
112 | ||
113 | return NOTIFY_DONE; | |
114 | } | |
115 | ||
116 | static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data) | |
117 | { | |
118 | struct pm8941_pwrkey *pwrkey = _data; | |
119 | unsigned int sts; | |
120 | int error; | |
121 | ||
122 | error = regmap_read(pwrkey->regmap, | |
123 | pwrkey->baseaddr + PON_RT_STS, &sts); | |
124 | if (error) | |
125 | return IRQ_HANDLED; | |
126 | ||
127 | input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET)); | |
128 | input_sync(pwrkey->input); | |
129 | ||
130 | return IRQ_HANDLED; | |
131 | } | |
132 | ||
133 | static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev) | |
134 | { | |
135 | struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); | |
136 | ||
137 | if (device_may_wakeup(dev)) | |
138 | enable_irq_wake(pwrkey->irq); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int __maybe_unused pm8941_pwrkey_resume(struct device *dev) | |
144 | { | |
145 | struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); | |
146 | ||
147 | if (device_may_wakeup(dev)) | |
148 | disable_irq_wake(pwrkey->irq); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops, | |
154 | pm8941_pwrkey_suspend, pm8941_pwrkey_resume); | |
155 | ||
156 | static int pm8941_pwrkey_probe(struct platform_device *pdev) | |
157 | { | |
158 | struct pm8941_pwrkey *pwrkey; | |
159 | bool pull_up; | |
160 | u32 req_delay; | |
161 | int error; | |
162 | ||
163 | if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay)) | |
164 | req_delay = 15625; | |
165 | ||
166 | if (req_delay > 2000000 || req_delay == 0) { | |
167 | dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up"); | |
172 | ||
173 | pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); | |
174 | if (!pwrkey) | |
175 | return -ENOMEM; | |
176 | ||
177 | pwrkey->dev = &pdev->dev; | |
178 | ||
179 | pwrkey->regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
180 | if (!pwrkey->regmap) { | |
181 | dev_err(&pdev->dev, "failed to locate regmap\n"); | |
182 | return -ENODEV; | |
183 | } | |
184 | ||
185 | pwrkey->irq = platform_get_irq(pdev, 0); | |
186 | if (pwrkey->irq < 0) { | |
187 | dev_err(&pdev->dev, "failed to get irq\n"); | |
188 | return pwrkey->irq; | |
189 | } | |
190 | ||
191 | error = of_property_read_u32(pdev->dev.of_node, "reg", | |
192 | &pwrkey->baseaddr); | |
193 | if (error) | |
194 | return error; | |
195 | ||
196 | error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2, | |
197 | &pwrkey->revision); | |
198 | if (error) { | |
199 | dev_err(&pdev->dev, "failed to set debounce: %d\n", error); | |
200 | return error; | |
201 | } | |
202 | ||
203 | pwrkey->input = devm_input_allocate_device(&pdev->dev); | |
204 | if (!pwrkey->input) { | |
205 | dev_dbg(&pdev->dev, "unable to allocate input device\n"); | |
206 | return -ENOMEM; | |
207 | } | |
208 | ||
209 | input_set_capability(pwrkey->input, EV_KEY, KEY_POWER); | |
210 | ||
211 | pwrkey->input->name = "pm8941_pwrkey"; | |
212 | pwrkey->input->phys = "pm8941_pwrkey/input0"; | |
213 | ||
214 | req_delay = (req_delay << 6) / USEC_PER_SEC; | |
215 | req_delay = ilog2(req_delay); | |
216 | ||
217 | error = regmap_update_bits(pwrkey->regmap, | |
218 | pwrkey->baseaddr + PON_DBC_CTL, | |
219 | PON_DBC_DELAY_MASK, | |
220 | req_delay); | |
221 | if (error) { | |
222 | dev_err(&pdev->dev, "failed to set debounce: %d\n", error); | |
223 | return error; | |
224 | } | |
225 | ||
226 | error = regmap_update_bits(pwrkey->regmap, | |
227 | pwrkey->baseaddr + PON_PULL_CTL, | |
228 | PON_KPDPWR_PULL_UP, | |
229 | pull_up ? PON_KPDPWR_PULL_UP : 0); | |
230 | if (error) { | |
231 | dev_err(&pdev->dev, "failed to set pull: %d\n", error); | |
232 | return error; | |
233 | } | |
234 | ||
235 | error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq, | |
236 | NULL, pm8941_pwrkey_irq, | |
237 | IRQF_ONESHOT, | |
238 | "pm8941_pwrkey", pwrkey); | |
239 | if (error) { | |
240 | dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error); | |
241 | return error; | |
242 | } | |
243 | ||
244 | error = input_register_device(pwrkey->input); | |
245 | if (error) { | |
246 | dev_err(&pdev->dev, "failed to register input device: %d\n", | |
247 | error); | |
248 | return error; | |
249 | } | |
250 | ||
251 | pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify, | |
252 | error = register_reboot_notifier(&pwrkey->reboot_notifier); | |
253 | if (error) { | |
254 | dev_err(&pdev->dev, "failed to register reboot notifier: %d\n", | |
255 | error); | |
256 | return error; | |
257 | } | |
258 | ||
259 | platform_set_drvdata(pdev, pwrkey); | |
260 | device_init_wakeup(&pdev->dev, 1); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static int pm8941_pwrkey_remove(struct platform_device *pdev) | |
266 | { | |
267 | struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev); | |
268 | ||
269 | device_init_wakeup(&pdev->dev, 0); | |
270 | unregister_reboot_notifier(&pwrkey->reboot_notifier); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static const struct of_device_id pm8941_pwr_key_id_table[] = { | |
276 | { .compatible = "qcom,pm8941-pwrkey" }, | |
277 | { } | |
278 | }; | |
279 | MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table); | |
280 | ||
281 | static struct platform_driver pm8941_pwrkey_driver = { | |
282 | .probe = pm8941_pwrkey_probe, | |
283 | .remove = pm8941_pwrkey_remove, | |
284 | .driver = { | |
285 | .name = "pm8941-pwrkey", | |
286 | .pm = &pm8941_pwr_key_pm_ops, | |
287 | .of_match_table = of_match_ptr(pm8941_pwr_key_id_table), | |
288 | }, | |
289 | }; | |
290 | module_platform_driver(pm8941_pwrkey_driver); | |
291 | ||
292 | MODULE_DESCRIPTION("PM8941 Power Key driver"); | |
293 | MODULE_LICENSE("GPL v2"); |