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
33struct 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
40struct 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
48struct axp20x_time {
49 unsigned int time;
50 unsigned int idx;
51};
52
53static 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
60static 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
67static 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
74static 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
81static 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
88static 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(map: axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, val: &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, fmt: "%u\n", val);
108}
109
110static 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, time: axp20x_pek->info->startup_time,
117 mask: axp20x_pek->info->startup_mask, buf);
118}
119
120static 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, time: axp20x_pek->info->shutdown_time,
127 mask: axp20x_pek->info->shutdown_mask, buf);
128}
129
130static 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(p: val_str, q: buf, size: 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(s: val_str, base: 10, res: &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(map: axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
168 mask, val: idx);
169 if (ret != 0)
170 return -EINVAL;
171
172 return count;
173}
174
175static 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, time: axp20x_pek->info->startup_time,
182 mask: axp20x_pek->info->startup_mask, buf, count);
183}
184
185static 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, time: axp20x_pek->info->shutdown_time,
192 mask: axp20x_pek->info->shutdown_mask, buf, count);
193}
194
195static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
196 axp20x_store_attr_startup);
197static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
198 axp20x_store_attr_shutdown);
199
200static struct attribute *axp20x_attrs[] = {
201 &dev_attr_startup.attr,
202 &dev_attr_shutdown.attr,
203 NULL,
204};
205ATTRIBUTE_GROUPS(axp20x);
206
207static 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(dev: 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(dev: idev, KEY_POWER, value: true);
218 else if (irq == axp20x_pek->irq_dbr)
219 input_report_key(dev: idev, KEY_POWER, value: false);
220
221 input_sync(dev: idev);
222
223 return IRQ_HANDLED;
224}
225
226static 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(data: axp20x->regmap_irqc,
237 irq: 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(data: axp20x->regmap_irqc,
243 irq: 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(dev: idev, EV_KEY, KEY_POWER);
256
257 input_set_drvdata(dev: idev, data: axp20x_pek);
258
259 error = devm_request_any_context_irq(dev: &pdev->dev, irq: axp20x_pek->irq_dbr,
260 handler: axp20x_pek_irq, irqflags: 0,
261 devname: "axp20x-pek-dbr", dev_id: 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(dev: &pdev->dev, irq: axp20x_pek->irq_dbf,
269 handler: axp20x_pek_irq, irqflags: 0,
270 devname: "axp20x-pek-dbf", dev_id: 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(dev: &pdev->dev, enable: true);
285
286 return 0;
287}
288
289static 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(hid: "INTCFD9", NULL, hrv: -1) ||
301 acpi_dev_present(hid: "ACPI0011", NULL, hrv: -1)))
302 return false;
303 }
304
305 return true;
306}
307
308static 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(dev: &pdev->dev, size: sizeof(struct axp20x_pek),
320 GFP_KERNEL);
321 if (!axp20x_pek)
322 return -ENOMEM;
323
324 axp20x_pek->axp20x = dev_get_drvdata(dev: 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, data: axp20x_pek);
335
336 return 0;
337}
338
339static 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(irq: axp20x_pek->irq_dbf);
349 enable_irq_wake(irq: axp20x_pek->irq_dbr);
350 } else {
351 disable_irq(irq: axp20x_pek->irq_dbf);
352 disable_irq(irq: axp20x_pek->irq_dbr);
353 }
354
355 return 0;
356}
357
358static 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(irq: axp20x_pek->irq_dbf);
364 disable_irq_wake(irq: axp20x_pek->irq_dbr);
365 } else {
366 enable_irq(irq: axp20x_pek->irq_dbf);
367 enable_irq(irq: axp20x_pek->irq_dbr);
368 }
369
370 return 0;
371}
372
373static 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(map: axp20x_pek->axp20x->regmap,
385 AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
386 BIT(AXP288_IRQ_POKN % 8));
387
388 return 0;
389}
390
391static 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
396static 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};
407MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
408
409static 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};
418module_platform_driver(axp20x_pek_driver);
419
420MODULE_DESCRIPTION("axp20x Power Button");
421MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
422MODULE_LICENSE("GPL");
423

source code of linux/drivers/input/misc/axp20x-pek.c