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
32struct 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
39struct 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
47struct axp20x_time {
48 unsigned int time;
49 unsigned int idx;
50};
51
52static 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
59static 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
66static 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
73static 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
80static 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
87static 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
109static 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
119static 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
129static 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
174static 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
184static 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
194DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, axp20x_store_attr_startup);
195DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
196 axp20x_store_attr_shutdown);
197
198static struct attribute *axp20x_attributes[] = {
199 &dev_attr_startup.attr,
200 &dev_attr_shutdown.attr,
201 NULL,
202};
203
204static const struct attribute_group axp20x_attribute_group = {
205 .attrs = axp20x_attributes,
206};
207
208static 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
227static 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
298static 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
326static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
327 struct platform_device *pdev)
328{
329 return true;
330}
331#endif
332
333static 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
371static 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
389static 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
395static 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};
406MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
407
408static 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};
416module_platform_driver(axp20x_pek_driver);
417
418MODULE_DESCRIPTION("axp20x Power Button");
419MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
420MODULE_LICENSE("GPL");
421