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 char val_str[20];
137 size_t len;
138 int ret, i;
139 unsigned int val, idx = 0;
140 unsigned int best_err = UINT_MAX;
141
142 val_str[sizeof(val_str) - 1] = '\0';
143 strncpy(val_str, buf, sizeof(val_str) - 1);
144 len = strlen(val_str);
145
146 if (len && val_str[len - 1] == '\n')
147 val_str[len - 1] = '\0';
148
149 ret = kstrtouint(val_str, 10, &val);
150 if (ret)
151 return ret;
152
153 for (i = 3; i >= 0; i--) {
154 unsigned int err;
155
156 err = abs(time[i].time - val);
157 if (err < best_err) {
158 best_err = err;
159 idx = time[i].idx;
160 }
161
162 if (!err)
163 break;
164 }
165
166 idx <<= ffs(mask) - 1;
167 ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
168 mask, idx);
169 if (ret != 0)
170 return -EINVAL;
171
172 return count;
173 }
174
axp20x_store_attr_startup(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)175 static ssize_t axp20x_store_attr_startup(struct device *dev,
176 struct device_attribute *attr,
177 const char *buf, size_t count)
178 {
179 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
180
181 return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
182 axp20x_pek->info->startup_mask, buf, count);
183 }
184
axp20x_store_attr_shutdown(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)185 static ssize_t axp20x_store_attr_shutdown(struct device *dev,
186 struct device_attribute *attr,
187 const char *buf, size_t count)
188 {
189 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
190
191 return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
192 axp20x_pek->info->shutdown_mask, buf, count);
193 }
194
195 static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
196 axp20x_store_attr_startup);
197 static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
198 axp20x_store_attr_shutdown);
199
200 static struct attribute *axp20x_attrs[] = {
201 &dev_attr_startup.attr,
202 &dev_attr_shutdown.attr,
203 NULL,
204 };
205 ATTRIBUTE_GROUPS(axp20x);
206
axp20x_pek_irq(int irq,void * pwr)207 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
208 {
209 struct input_dev *idev = pwr;
210 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
211
212 /*
213 * The power-button is connected to ground so a falling edge (dbf)
214 * means it is pressed.
215 */
216 if (irq == axp20x_pek->irq_dbf)
217 input_report_key(idev, KEY_POWER, true);
218 else if (irq == axp20x_pek->irq_dbr)
219 input_report_key(idev, KEY_POWER, false);
220
221 input_sync(idev);
222
223 return IRQ_HANDLED;
224 }
225
axp20x_pek_probe_input_device(struct axp20x_pek * axp20x_pek,struct platform_device * pdev)226 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
227 struct platform_device *pdev)
228 {
229 struct axp20x_dev *axp20x = axp20x_pek->axp20x;
230 struct input_dev *idev;
231 int error;
232
233 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
234 if (axp20x_pek->irq_dbr < 0)
235 return axp20x_pek->irq_dbr;
236 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
237 axp20x_pek->irq_dbr);
238
239 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
240 if (axp20x_pek->irq_dbf < 0)
241 return axp20x_pek->irq_dbf;
242 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
243 axp20x_pek->irq_dbf);
244
245 axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
246 if (!axp20x_pek->input)
247 return -ENOMEM;
248
249 idev = axp20x_pek->input;
250
251 idev->name = "axp20x-pek";
252 idev->phys = "m1kbd/input2";
253 idev->dev.parent = &pdev->dev;
254
255 input_set_capability(idev, EV_KEY, KEY_POWER);
256
257 input_set_drvdata(idev, axp20x_pek);
258
259 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
260 axp20x_pek_irq, 0,
261 "axp20x-pek-dbr", idev);
262 if (error < 0) {
263 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
264 axp20x_pek->irq_dbr, error);
265 return error;
266 }
267
268 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
269 axp20x_pek_irq, 0,
270 "axp20x-pek-dbf", idev);
271 if (error < 0) {
272 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
273 axp20x_pek->irq_dbf, error);
274 return error;
275 }
276
277 error = input_register_device(idev);
278 if (error) {
279 dev_err(&pdev->dev, "Can't register input device: %d\n",
280 error);
281 return error;
282 }
283
284 device_init_wakeup(&pdev->dev, true);
285
286 return 0;
287 }
288
axp20x_pek_should_register_input(struct axp20x_pek * axp20x_pek)289 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
290 {
291 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
292 axp20x_pek->axp20x->variant == AXP288_ID) {
293 /*
294 * On Cherry Trail platforms (hrv == 3), do not register the
295 * input device if there is an "INTCFD9" or "ACPI0011" gpio
296 * button ACPI device, as that handles the power button too,
297 * and otherwise we end up reporting all presses twice.
298 */
299 if (soc_intel_is_cht() &&
300 (acpi_dev_present("INTCFD9", NULL, -1) ||
301 acpi_dev_present("ACPI0011", NULL, -1)))
302 return false;
303 }
304
305 return true;
306 }
307
axp20x_pek_probe(struct platform_device * pdev)308 static int axp20x_pek_probe(struct platform_device *pdev)
309 {
310 struct axp20x_pek *axp20x_pek;
311 const struct platform_device_id *match = platform_get_device_id(pdev);
312 int error;
313
314 if (!match) {
315 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
316 return -EINVAL;
317 }
318
319 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
320 GFP_KERNEL);
321 if (!axp20x_pek)
322 return -ENOMEM;
323
324 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
325
326 if (axp20x_pek_should_register_input(axp20x_pek)) {
327 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
328 if (error)
329 return error;
330 }
331
332 axp20x_pek->info = (struct axp20x_info *)match->driver_data;
333
334 platform_set_drvdata(pdev, axp20x_pek);
335
336 return 0;
337 }
338
axp20x_pek_suspend(struct device * dev)339 static int axp20x_pek_suspend(struct device *dev)
340 {
341 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
342
343 /*
344 * As nested threaded IRQs are not automatically disabled during
345 * suspend, we must explicitly disable non-wakeup IRQs.
346 */
347 if (device_may_wakeup(dev)) {
348 enable_irq_wake(axp20x_pek->irq_dbf);
349 enable_irq_wake(axp20x_pek->irq_dbr);
350 } else {
351 disable_irq(axp20x_pek->irq_dbf);
352 disable_irq(axp20x_pek->irq_dbr);
353 }
354
355 return 0;
356 }
357
axp20x_pek_resume(struct device * dev)358 static int axp20x_pek_resume(struct device *dev)
359 {
360 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
361
362 if (device_may_wakeup(dev)) {
363 disable_irq_wake(axp20x_pek->irq_dbf);
364 disable_irq_wake(axp20x_pek->irq_dbr);
365 } else {
366 enable_irq(axp20x_pek->irq_dbf);
367 enable_irq(axp20x_pek->irq_dbr);
368 }
369
370 return 0;
371 }
372
axp20x_pek_resume_noirq(struct device * dev)373 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
374 {
375 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
376
377 if (axp20x_pek->axp20x->variant != AXP288_ID)
378 return 0;
379
380 /*
381 * Clear interrupts from button presses during suspend, to avoid
382 * a wakeup power-button press getting reported to userspace.
383 */
384 regmap_write(axp20x_pek->axp20x->regmap,
385 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
386 BIT(AXP288_IRQ_POKN % 8));
387
388 return 0;
389 }
390
391 static const struct dev_pm_ops axp20x_pek_pm_ops = {
392 SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
393 .resume_noirq = pm_sleep_ptr(axp20x_pek_resume_noirq),
394 };
395
396 static const struct platform_device_id axp_pek_id_match[] = {
397 {
398 .name = "axp20x-pek",
399 .driver_data = (kernel_ulong_t)&axp20x_info,
400 },
401 {
402 .name = "axp221-pek",
403 .driver_data = (kernel_ulong_t)&axp221_info,
404 },
405 { /* sentinel */ }
406 };
407 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
408
409 static struct platform_driver axp20x_pek_driver = {
410 .probe = axp20x_pek_probe,
411 .id_table = axp_pek_id_match,
412 .driver = {
413 .name = "axp20x-pek",
414 .pm = pm_sleep_ptr(&axp20x_pek_pm_ops),
415 .dev_groups = axp20x_groups,
416 },
417 };
418 module_platform_driver(axp20x_pek_driver);
419
420 MODULE_DESCRIPTION("axp20x Power Button");
421 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
422 MODULE_LICENSE("GPL");
423