GNU Linux-libre 4.14.266-gnu1
[releases.git] / drivers / input / misc / axp20x-pek.c
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_device.h>
26 #include <linux/regmap.h>
27 #include <linux/slab.h>
28
29 #define AXP20X_PEK_STARTUP_MASK         (0xc0)
30 #define AXP20X_PEK_SHUTDOWN_MASK        (0x03)
31
32 struct axp20x_info {
33         const struct axp20x_time *startup_time;
34         unsigned int startup_mask;
35         const struct axp20x_time *shutdown_time;
36         unsigned int shutdown_mask;
37 };
38
39 struct axp20x_pek {
40         struct axp20x_dev *axp20x;
41         struct input_dev *input;
42         struct axp20x_info *info;
43         int irq_dbr;
44         int irq_dbf;
45 };
46
47 struct axp20x_time {
48         unsigned int time;
49         unsigned int idx;
50 };
51
52 static const struct axp20x_time startup_time[] = {
53         { .time = 128,  .idx = 0 },
54         { .time = 1000, .idx = 2 },
55         { .time = 3000, .idx = 1 },
56         { .time = 2000, .idx = 3 },
57 };
58
59 static const struct axp20x_time axp221_startup_time[] = {
60         { .time = 128,  .idx = 0 },
61         { .time = 1000, .idx = 1 },
62         { .time = 2000, .idx = 2 },
63         { .time = 3000, .idx = 3 },
64 };
65
66 static const struct axp20x_time shutdown_time[] = {
67         { .time = 4000,  .idx = 0 },
68         { .time = 6000,  .idx = 1 },
69         { .time = 8000,  .idx = 2 },
70         { .time = 10000, .idx = 3 },
71 };
72
73 static const struct axp20x_info axp20x_info = {
74         .startup_time = startup_time,
75         .startup_mask = AXP20X_PEK_STARTUP_MASK,
76         .shutdown_time = shutdown_time,
77         .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
78 };
79
80 static const struct axp20x_info axp221_info = {
81         .startup_time = axp221_startup_time,
82         .startup_mask = AXP20X_PEK_STARTUP_MASK,
83         .shutdown_time = shutdown_time,
84         .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
85 };
86
87 static ssize_t axp20x_show_attr(struct device *dev,
88                                 const struct axp20x_time *time,
89                                 unsigned int mask, char *buf)
90 {
91         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
92         unsigned int val;
93         int ret, i;
94
95         ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
96         if (ret != 0)
97                 return ret;
98
99         val &= mask;
100         val >>= ffs(mask) - 1;
101
102         for (i = 0; i < 4; i++)
103                 if (val == time[i].idx)
104                         val = time[i].time;
105
106         return sprintf(buf, "%u\n", val);
107 }
108
109 static ssize_t axp20x_show_attr_startup(struct device *dev,
110                                         struct device_attribute *attr,
111                                         char *buf)
112 {
113         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
114
115         return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
116                                 axp20x_pek->info->startup_mask, buf);
117 }
118
119 static ssize_t axp20x_show_attr_shutdown(struct device *dev,
120                                          struct device_attribute *attr,
121                                          char *buf)
122 {
123         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
124
125         return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
126                                 axp20x_pek->info->shutdown_mask, buf);
127 }
128
129 static ssize_t axp20x_store_attr(struct device *dev,
130                                  const struct axp20x_time *time,
131                                  unsigned int mask, const char *buf,
132                                  size_t count)
133 {
134         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
135         char val_str[20];
136         size_t len;
137         int ret, i;
138         unsigned int val, idx = 0;
139         unsigned int best_err = UINT_MAX;
140
141         val_str[sizeof(val_str) - 1] = '\0';
142         strncpy(val_str, buf, sizeof(val_str) - 1);
143         len = strlen(val_str);
144
145         if (len && val_str[len - 1] == '\n')
146                 val_str[len - 1] = '\0';
147
148         ret = kstrtouint(val_str, 10, &val);
149         if (ret)
150                 return ret;
151
152         for (i = 3; i >= 0; i--) {
153                 unsigned int err;
154
155                 err = abs(time[i].time - val);
156                 if (err < best_err) {
157                         best_err = err;
158                         idx = time[i].idx;
159                 }
160
161                 if (!err)
162                         break;
163         }
164
165         idx <<= ffs(mask) - 1;
166         ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
167                                  mask, idx);
168         if (ret != 0)
169                 return -EINVAL;
170
171         return count;
172 }
173
174 static ssize_t axp20x_store_attr_startup(struct device *dev,
175                                          struct device_attribute *attr,
176                                          const char *buf, size_t count)
177 {
178         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
179
180         return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
181                                  axp20x_pek->info->startup_mask, buf, count);
182 }
183
184 static ssize_t axp20x_store_attr_shutdown(struct device *dev,
185                                           struct device_attribute *attr,
186                                           const char *buf, size_t count)
187 {
188         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
189
190         return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
191                                  axp20x_pek->info->shutdown_mask, buf, count);
192 }
193
194 DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, axp20x_store_attr_startup);
195 DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
196             axp20x_store_attr_shutdown);
197
198 static struct attribute *axp20x_attributes[] = {
199         &dev_attr_startup.attr,
200         &dev_attr_shutdown.attr,
201         NULL,
202 };
203
204 static const struct attribute_group axp20x_attribute_group = {
205         .attrs = axp20x_attributes,
206 };
207
208 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
209 {
210         struct input_dev *idev = pwr;
211         struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
212
213         /*
214          * The power-button is connected to ground so a falling edge (dbf)
215          * means it is pressed.
216          */
217         if (irq == axp20x_pek->irq_dbf)
218                 input_report_key(idev, KEY_POWER, true);
219         else if (irq == axp20x_pek->irq_dbr)
220                 input_report_key(idev, KEY_POWER, false);
221
222         input_sync(idev);
223
224         return IRQ_HANDLED;
225 }
226
227 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
228                                          struct platform_device *pdev)
229 {
230         struct axp20x_dev *axp20x = axp20x_pek->axp20x;
231         struct input_dev *idev;
232         int error;
233
234         axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
235         if (axp20x_pek->irq_dbr < 0) {
236                 dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
237                                 axp20x_pek->irq_dbr);
238                 return axp20x_pek->irq_dbr;
239         }
240         axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
241                                                   axp20x_pek->irq_dbr);
242
243         axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
244         if (axp20x_pek->irq_dbf < 0) {
245                 dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
246                                 axp20x_pek->irq_dbf);
247                 return axp20x_pek->irq_dbf;
248         }
249         axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
250                                                   axp20x_pek->irq_dbf);
251
252         axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
253         if (!axp20x_pek->input)
254                 return -ENOMEM;
255
256         idev = axp20x_pek->input;
257
258         idev->name = "axp20x-pek";
259         idev->phys = "m1kbd/input2";
260         idev->dev.parent = &pdev->dev;
261
262         input_set_capability(idev, EV_KEY, KEY_POWER);
263
264         input_set_drvdata(idev, axp20x_pek);
265
266         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
267                                              axp20x_pek_irq, 0,
268                                              "axp20x-pek-dbr", idev);
269         if (error < 0) {
270                 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
271                         axp20x_pek->irq_dbr, error);
272                 return error;
273         }
274
275         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
276                                           axp20x_pek_irq, 0,
277                                           "axp20x-pek-dbf", idev);
278         if (error < 0) {
279                 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
280                         axp20x_pek->irq_dbf, error);
281                 return error;
282         }
283
284         error = input_register_device(idev);
285         if (error) {
286                 dev_err(&pdev->dev, "Can't register input device: %d\n",
287                         error);
288                 return error;
289         }
290
291         if (axp20x_pek->axp20x->variant == AXP288_ID)
292                 enable_irq_wake(axp20x_pek->irq_dbr);
293
294         return 0;
295 }
296
297 #ifdef CONFIG_ACPI
298 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
299                                              struct platform_device *pdev)
300 {
301         unsigned long long hrv = 0;
302         acpi_status status;
303
304         if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
305             axp20x_pek->axp20x->variant == AXP288_ID) {
306                 status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
307                                                "_HRV", NULL, &hrv);
308                 if (ACPI_FAILURE(status))
309                         dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
310
311                 /*
312                  * On Cherry Trail platforms (hrv == 3), do not register the
313                  * input device if there is an "INTCFD9" or "ACPI0011" gpio
314                  * button ACPI device, as that handles the power button too,
315                  * and otherwise we end up reporting all presses twice.
316                  */
317                 if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
318                                  acpi_dev_present("ACPI0011", NULL, -1)))
319                         return false;
320
321         }
322
323         return true;
324 }
325 #else
326 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
327                                              struct platform_device *pdev)
328 {
329         return true;
330 }
331 #endif
332
333 static int axp20x_pek_probe(struct platform_device *pdev)
334 {
335         struct axp20x_pek *axp20x_pek;
336         const struct platform_device_id *match = platform_get_device_id(pdev);
337         int error;
338
339         if (!match) {
340                 dev_err(&pdev->dev, "Failed to get platform_device_id\n");
341                 return -EINVAL;
342         }
343
344         axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
345                                   GFP_KERNEL);
346         if (!axp20x_pek)
347                 return -ENOMEM;
348
349         axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
350
351         if (axp20x_pek_should_register_input(axp20x_pek, pdev)) {
352                 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
353                 if (error)
354                         return error;
355         }
356
357         axp20x_pek->info = (struct axp20x_info *)match->driver_data;
358
359         error = devm_device_add_group(&pdev->dev, &axp20x_attribute_group);
360         if (error) {
361                 dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
362                         error);
363                 return error;
364         }
365
366         platform_set_drvdata(pdev, axp20x_pek);
367
368         return 0;
369 }
370
371 static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
372 {
373         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
374
375         if (axp20x_pek->axp20x->variant != AXP288_ID)
376                 return 0;
377
378         /*
379          * Clear interrupts from button presses during suspend, to avoid
380          * a wakeup power-button press getting reported to userspace.
381          */
382         regmap_write(axp20x_pek->axp20x->regmap,
383                      AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
384                      BIT(AXP288_IRQ_POKN % 8));
385
386         return 0;
387 }
388
389 static const struct dev_pm_ops axp20x_pek_pm_ops = {
390 #ifdef CONFIG_PM_SLEEP
391         .resume_noirq = axp20x_pek_resume_noirq,
392 #endif
393 };
394
395 static const struct platform_device_id axp_pek_id_match[] = {
396         {
397                 .name = "axp20x-pek",
398                 .driver_data = (kernel_ulong_t)&axp20x_info,
399         },
400         {
401                 .name = "axp221-pek",
402                 .driver_data = (kernel_ulong_t)&axp221_info,
403         },
404         { /* sentinel */ }
405 };
406 MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
407
408 static struct platform_driver axp20x_pek_driver = {
409         .probe          = axp20x_pek_probe,
410         .id_table       = axp_pek_id_match,
411         .driver         = {
412                 .name           = "axp20x-pek",
413                 .pm             = &axp20x_pek_pm_ops,
414         },
415 };
416 module_platform_driver(axp20x_pek_driver);
417
418 MODULE_DESCRIPTION("axp20x Power Button");
419 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
420 MODULE_LICENSE("GPL");