1 /*
2 * axp20x power button driver.
3 *
4 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
5 *
6 * This file is subject to the terms and conditions of the GNU General
7 * Public License. See the file "COPYING" in the main directory of this
8 * archive for more details.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/acpi.h>
17 #include <linux/errno.h>
18 #include <linux/irq.h>
19 #include <linux/init.h>
20 #include <linux/input.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/mfd/axp20x.h>
24 #include <linux/module.h>
25 #include <linux/platform_data/x86/soc.h>
26 #include <linux/platform_device.h>
27 #include <linux/regmap.h>
28 #include <linux/slab.h>
29
30 #define AXP20X_PEK_STARTUP_MASK (0xc0)
31 #define AXP20X_PEK_SHUTDOWN_MASK (0x03)
32
33 struct axp20x_info {
34 const struct axp20x_time *startup_time;
35 unsigned int startup_mask;
36 const struct axp20x_time *shutdown_time;
37 unsigned int shutdown_mask;
38 };
39
40 struct axp20x_pek {
41 struct axp20x_dev *axp20x;
42 struct input_dev *input;
43 struct axp20x_info *info;
44 int irq_dbr;
45 int irq_dbf;
46 };
47
48 struct axp20x_time {
49 unsigned int time;
50 unsigned int idx;
51 };
52
53 static const struct axp20x_time startup_time[] = {
54 { .time = 128, .idx = 0 },
55 { .time = 1000, .idx = 2 },
56 { .time = 3000, .idx = 1 },
57 { .time = 2000, .idx = 3 },
58 };
59
60 static const struct axp20x_time axp221_startup_time[] = {
61 { .time = 128, .idx = 0 },
62 { .time = 1000, .idx = 1 },
63 { .time = 2000, .idx = 2 },
64 { .time = 3000, .idx = 3 },
65 };
66
67 static const struct axp20x_time shutdown_time[] = {
68 { .time = 4000, .idx = 0 },
69 { .time = 6000, .idx = 1 },
70 { .time = 8000, .idx = 2 },
71 { .time = 10000, .idx = 3 },
72 };
73
74 static const struct axp20x_info axp20x_info = {
75 .startup_time = startup_time,
76 .startup_mask = AXP20X_PEK_STARTUP_MASK,
77 .shutdown_time = shutdown_time,
78 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
79 };
80
81 static const struct axp20x_info axp221_info = {
82 .startup_time = axp221_startup_time,
83 .startup_mask = AXP20X_PEK_STARTUP_MASK,
84 .shutdown_time = shutdown_time,
85 .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
86 };
87
axp20x_show_attr(struct device * dev,const struct axp20x_time * time,unsigned int mask,char * buf)88 static ssize_t axp20x_show_attr(struct device *dev,
89 const struct axp20x_time *time,
90 unsigned int mask, char *buf)
91 {
92 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
93 unsigned int val;
94 int ret, i;
95
96 ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
97 if (ret != 0)
98 return ret;
99
100 val &= mask;
101 val >>= ffs(mask) - 1;
102
103 for (i = 0; i < 4; i++)
104 if (val == time[i].idx)
105 val = time[i].time;
106
107 return sprintf(buf, "%u\n", val);
108 }
109
axp20x_show_attr_startup(struct device * dev,struct device_attribute * attr,char * buf)110 static ssize_t axp20x_show_attr_startup(struct device *dev,
111 struct device_attribute *attr,
112 char *buf)
113 {
114 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
115
116 return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
117 axp20x_pek->info->startup_mask, buf);
118 }
119
axp20x_show_attr_shutdown(struct device * dev,struct device_attribute * attr,char * buf)120 static ssize_t axp20x_show_attr_shutdown(struct device *dev,
121 struct device_attribute *attr,
122 char *buf)
123 {
124 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
125
126 return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
127 axp20x_pek->info->shutdown_mask, buf);
128 }
129
axp20x_store_attr(struct device * dev,const struct axp20x_time * time,unsigned int mask,const char * buf,size_t count)130 static ssize_t axp20x_store_attr(struct device *dev,
131 const struct axp20x_time *time,
132 unsigned int mask, const char *buf,
133 size_t count)
134 {
135 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
136 int ret, i;
137 unsigned int val, idx = 0;
138 unsigned int best_err = UINT_MAX;
139
140 ret = kstrtouint(buf, 10, &val);
141 if (ret)
142 return ret;
143
144 for (i = 3; i >= 0; i--) {
145 unsigned int err;
146
147 err = abs(time[i].time - val);
148 if (err < best_err) {
149 best_err = err;
150 idx = time[i].idx;
151 }
152
153 if (!err)
154 break;
155 }
156
157 idx <<= ffs(mask) - 1;
158 ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
159 mask, idx);
160 if (ret != 0)
161 return -EINVAL;
162
163 return count;
164 }
165
axp20x_store_attr_startup(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)166 static ssize_t axp20x_store_attr_startup(struct device *dev,
167 struct device_attribute *attr,
168 const char *buf, size_t count)
169 {
170 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
171
172 return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
173 axp20x_pek->info->startup_mask, buf, count);
174 }
175
axp20x_store_attr_shutdown(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)176 static ssize_t axp20x_store_attr_shutdown(struct device *dev,
177 struct device_attribute *attr,
178 const char *buf, size_t count)
179 {
180 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
181
182 return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
183 axp20x_pek->info->shutdown_mask, buf, count);
184 }
185
186 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
187 axp20x_store_attr_startup);
188 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
189 axp20x_store_attr_shutdown);
190
191 static struct attribute *axp20x_attrs[] = {
192 &dev_attr_startup.attr,
193 &dev_attr_shutdown.attr,
194 NULL,
195 };
196 ATTRIBUTE_GROUPS(axp20x);
197
axp20x_pek_irq(int irq,void * pwr)198 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
199 {
200 struct input_dev *idev = pwr;
201 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
202
203 /*
204 * The power-button is connected to ground so a falling edge (dbf)
205 * means it is pressed.
206 */
207 if (irq == axp20x_pek->irq_dbf)
208 input_report_key(idev, KEY_POWER, true);
209 else if (irq == axp20x_pek->irq_dbr)
210 input_report_key(idev, KEY_POWER, false);
211
212 input_sync(idev);
213
214 return IRQ_HANDLED;
215 }
216
axp20x_pek_probe_input_device(struct axp20x_pek * axp20x_pek,struct platform_device * pdev)217 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
218 struct platform_device *pdev)
219 {
220 struct axp20x_dev *axp20x = axp20x_pek->axp20x;
221 struct input_dev *idev;
222 int error;
223
224 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
225 if (axp20x_pek->irq_dbr < 0)
226 return axp20x_pek->irq_dbr;
227 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
228 axp20x_pek->irq_dbr);
229
230 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
231 if (axp20x_pek->irq_dbf < 0)
232 return axp20x_pek->irq_dbf;
233 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
234 axp20x_pek->irq_dbf);
235
236 axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
237 if (!axp20x_pek->input)
238 return -ENOMEM;
239
240 idev = axp20x_pek->input;
241
242 idev->name = "axp20x-pek";
243 idev->phys = "m1kbd/input2";
244 idev->dev.parent = &pdev->dev;
245
246 input_set_capability(idev, EV_KEY, KEY_POWER);
247
248 input_set_drvdata(idev, axp20x_pek);
249
250 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
251 axp20x_pek_irq, 0,
252 "axp20x-pek-dbr", idev);
253 if (error < 0) {
254 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
255 axp20x_pek->irq_dbr, error);
256 return error;
257 }
258
259 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
260 axp20x_pek_irq, 0,
261 "axp20x-pek-dbf", idev);
262 if (error < 0) {
263 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
264 axp20x_pek->irq_dbf, error);
265 return error;
266 }
267
268 error = input_register_device(idev);
269 if (error) {
270 dev_err(&pdev->dev, "Can't register input device: %d\n",
271 error);
272 return error;
273 }
274
275 device_init_wakeup(&pdev->dev, true);
276
277 return 0;
278 }
279
axp20x_pek_should_register_input(struct axp20x_pek * axp20x_pek)280 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
281 {
282 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
283 axp20x_pek->axp20x->variant == AXP288_ID) {
284 /*
285 * On Cherry Trail platforms (hrv == 3), do not register the
286 * input device if there is an "INTCFD9" or "ACPI0011" gpio
287 * button ACPI device, as that handles the power button too,
288 * and otherwise we end up reporting all presses twice.
289 */
290 if (soc_intel_is_cht() &&
291 (acpi_dev_present("INTCFD9", NULL, -1) ||
292 acpi_dev_present("ACPI0011", NULL, -1)))
293 return false;
294 }
295
296 return true;
297 }
298
axp20x_pek_probe(struct platform_device * pdev)299 static int axp20x_pek_probe(struct platform_device *pdev)
300 {
301 struct axp20x_pek *axp20x_pek;
302 const struct platform_device_id *match = platform_get_device_id(pdev);
303 int error;
304
305 if (!match) {
306 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
307 return -EINVAL;
308 }
309
310 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
311 GFP_KERNEL);
312 if (!axp20x_pek)
313 return -ENOMEM;
314
315 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
316
317 if (axp20x_pek_should_register_input(axp20x_pek)) {
318 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
319 if (error)
320 return error;
321 }
322
323 axp20x_pek->info = (struct axp20x_info *)match->driver_data;
324
325 platform_set_drvdata(pdev, axp20x_pek);
326
327 return 0;
328 }
329
axp20x_pek_suspend(struct device * dev)330 static int axp20x_pek_suspend(struct device *dev)
331 {
332 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
333
334 /*
335 * As nested threaded IRQs are not automatically disabled during
336 * suspend, we must explicitly disable non-wakeup IRQs.
337 */
338 if (device_may_wakeup(dev)) {
339 enable_irq_wake(axp20x_pek->irq_dbf);
340 enable_irq_wake(axp20x_pek->irq_dbr);
341 } else {
342 disable_irq(axp20x_pek->irq_dbf);
343 disable_irq(axp20x_pek->irq_dbr);
344 }
345
346 return 0;
347 }
348
axp20x_pek_resume(struct device * dev)349 static int axp20x_pek_resume(struct device *dev)
350 {
351 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
352
353 if (device_may_wakeup(dev)) {
354 disable_irq_wake(axp20x_pek->irq_dbf);
355 disable_irq_wake(axp20x_pek->irq_dbr);
356 } else {
357 enable_irq(axp20x_pek->irq_dbf);
358 enable_irq(axp20x_pek->irq_dbr);
359 }
360
361 return 0;
362 }
363
axp20x_pek_resume_noirq(struct device * dev)364 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
365 {
366 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
367
368 if (axp20x_pek->axp20x->variant != AXP288_ID)
369 return 0;
370
371 /*
372 * Clear interrupts from button presses during suspend, to avoid
373 * a wakeup power-button press getting reported to userspace.
374 */
375 regmap_write(axp20x_pek->axp20x->regmap,
376 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
377 BIT(AXP288_IRQ_POKN % 8));
378
379 return 0;
380 }
381
382 static const struct dev_pm_ops axp20x_pek_pm_ops = {
383 SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
384 .resume_noirq = pm_sleep_ptr(axp20x_pek_resume_noirq),
385 };
386
387 static const struct platform_device_id axp_pek_id_match[] = {
388 {
389 .name = "axp20x-pek",
390 .driver_data = (kernel_ulong_t)&axp20x_info,
391 },
392 {
393 .name = "axp221-pek",
394 .driver_data = (kernel_ulong_t)&axp221_info,
395 },
396 { /* sentinel */ }
397 };
398 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
399
400 static struct platform_driver axp20x_pek_driver = {
401 .probe = axp20x_pek_probe,
402 .id_table = axp_pek_id_match,
403 .driver = {
404 .name = "axp20x-pek",
405 .pm = pm_sleep_ptr(&axp20x_pek_pm_ops),
406 .dev_groups = axp20x_groups,
407 },
408 };
409 module_platform_driver(axp20x_pek_driver);
410
411 MODULE_DESCRIPTION("axp20x Power Button");
412 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
413 MODULE_LICENSE("GPL");
414