2 * axp20x power button driver.
4 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
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.
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.
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>
29 #define AXP20X_PEK_STARTUP_MASK (0xc0)
30 #define AXP20X_PEK_SHUTDOWN_MASK (0x03)
33 struct axp20x_dev *axp20x;
34 struct input_dev *input;
44 static const struct axp20x_time startup_time[] = {
45 { .time = 128, .idx = 0 },
46 { .time = 1000, .idx = 2 },
47 { .time = 3000, .idx = 1 },
48 { .time = 2000, .idx = 3 },
51 static const struct axp20x_time shutdown_time[] = {
52 { .time = 4000, .idx = 0 },
53 { .time = 6000, .idx = 1 },
54 { .time = 8000, .idx = 2 },
55 { .time = 10000, .idx = 3 },
58 struct axp20x_pek_ext_attr {
59 const struct axp20x_time *p_time;
63 static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
64 .p_time = startup_time,
65 .mask = AXP20X_PEK_STARTUP_MASK,
68 static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
69 .p_time = shutdown_time,
70 .mask = AXP20X_PEK_SHUTDOWN_MASK,
73 static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
75 return container_of(attr, struct dev_ext_attribute, attr)->var;
78 static ssize_t axp20x_show_ext_attr(struct device *dev,
79 struct device_attribute *attr, char *buf)
81 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
82 struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
86 ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
90 val &= axp20x_ea->mask;
91 val >>= ffs(axp20x_ea->mask) - 1;
93 for (i = 0; i < 4; i++)
94 if (val == axp20x_ea->p_time[i].idx)
95 val = axp20x_ea->p_time[i].time;
97 return sprintf(buf, "%u\n", val);
100 static ssize_t axp20x_store_ext_attr(struct device *dev,
101 struct device_attribute *attr,
102 const char *buf, size_t count)
104 struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
105 struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
109 unsigned int val, idx = 0;
110 unsigned int best_err = UINT_MAX;
112 val_str[sizeof(val_str) - 1] = '\0';
113 strncpy(val_str, buf, sizeof(val_str) - 1);
114 len = strlen(val_str);
116 if (len && val_str[len - 1] == '\n')
117 val_str[len - 1] = '\0';
119 ret = kstrtouint(val_str, 10, &val);
123 for (i = 3; i >= 0; i--) {
126 err = abs(axp20x_ea->p_time[i].time - val);
127 if (err < best_err) {
129 idx = axp20x_ea->p_time[i].idx;
136 idx <<= ffs(axp20x_ea->mask) - 1;
137 ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
139 axp20x_ea->mask, idx);
146 static struct dev_ext_attribute axp20x_dev_attr_startup = {
147 .attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
148 .var = &axp20x_pek_startup_ext_attr,
151 static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
152 .attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
153 .var = &axp20x_pek_shutdown_ext_attr,
156 static struct attribute *axp20x_attributes[] = {
157 &axp20x_dev_attr_startup.attr.attr,
158 &axp20x_dev_attr_shutdown.attr.attr,
162 static const struct attribute_group axp20x_attribute_group = {
163 .attrs = axp20x_attributes,
166 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
168 struct input_dev *idev = pwr;
169 struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
172 * The power-button is connected to ground so a falling edge (dbf)
173 * means it is pressed.
175 if (irq == axp20x_pek->irq_dbf)
176 input_report_key(idev, KEY_POWER, true);
177 else if (irq == axp20x_pek->irq_dbr)
178 input_report_key(idev, KEY_POWER, false);
185 static void axp20x_remove_sysfs_group(void *_data)
187 struct device *dev = _data;
189 sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
192 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
193 struct platform_device *pdev)
195 struct axp20x_dev *axp20x = axp20x_pek->axp20x;
196 struct input_dev *idev;
199 axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
200 if (axp20x_pek->irq_dbr < 0) {
201 dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
202 axp20x_pek->irq_dbr);
203 return axp20x_pek->irq_dbr;
205 axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
206 axp20x_pek->irq_dbr);
208 axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
209 if (axp20x_pek->irq_dbf < 0) {
210 dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
211 axp20x_pek->irq_dbf);
212 return axp20x_pek->irq_dbf;
214 axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
215 axp20x_pek->irq_dbf);
217 axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
218 if (!axp20x_pek->input)
221 idev = axp20x_pek->input;
223 idev->name = "axp20x-pek";
224 idev->phys = "m1kbd/input2";
225 idev->dev.parent = &pdev->dev;
227 input_set_capability(idev, EV_KEY, KEY_POWER);
229 input_set_drvdata(idev, axp20x_pek);
231 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
233 "axp20x-pek-dbr", idev);
235 dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
236 axp20x_pek->irq_dbr, error);
240 error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
242 "axp20x-pek-dbf", idev);
244 dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
245 axp20x_pek->irq_dbf, error);
249 error = input_register_device(idev);
251 dev_err(&pdev->dev, "Can't register input device: %d\n",
260 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
261 struct platform_device *pdev)
263 unsigned long long hrv = 0;
266 if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
267 axp20x_pek->axp20x->variant == AXP288_ID) {
268 status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
270 if (ACPI_FAILURE(status))
271 dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
274 * On Cherry Trail platforms (hrv == 3), do not register the
275 * input device if there is an "INTCFD9" or "ACPI0011" gpio
276 * button ACPI device, as that handles the power button too,
277 * and otherwise we end up reporting all presses twice.
279 if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
280 acpi_dev_present("ACPI0011", NULL, -1)))
288 static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
289 struct platform_device *pdev)
295 static int axp20x_pek_probe(struct platform_device *pdev)
297 struct axp20x_pek *axp20x_pek;
300 axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
305 axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
307 if (axp20x_pek_should_register_input(axp20x_pek, pdev)) {
308 error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
313 error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
315 dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
320 error = devm_add_action(&pdev->dev,
321 axp20x_remove_sysfs_group, &pdev->dev);
323 axp20x_remove_sysfs_group(&pdev->dev);
324 dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
329 platform_set_drvdata(pdev, axp20x_pek);
334 static struct platform_driver axp20x_pek_driver = {
335 .probe = axp20x_pek_probe,
337 .name = "axp20x-pek",
340 module_platform_driver(axp20x_pek_driver);
342 MODULE_DESCRIPTION("axp20x Power Button");
343 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
344 MODULE_LICENSE("GPL");
345 MODULE_ALIAS("platform:axp20x-pek");