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5b6c26a9 CC |
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/errno.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/input.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mfd/axp20x.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/regmap.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #define AXP20X_PEK_STARTUP_MASK (0xc0) | |
29 | #define AXP20X_PEK_SHUTDOWN_MASK (0x03) | |
30 | ||
31 | struct axp20x_pek { | |
32 | struct axp20x_dev *axp20x; | |
33 | struct input_dev *input; | |
34 | int irq_dbr; | |
35 | int irq_dbf; | |
36 | }; | |
37 | ||
38 | struct axp20x_time { | |
39 | unsigned int time; | |
40 | unsigned int idx; | |
41 | }; | |
42 | ||
43 | static const struct axp20x_time startup_time[] = { | |
44 | { .time = 128, .idx = 0 }, | |
45 | { .time = 1000, .idx = 2 }, | |
46 | { .time = 3000, .idx = 1 }, | |
47 | { .time = 2000, .idx = 3 }, | |
48 | }; | |
49 | ||
50 | static const struct axp20x_time shutdown_time[] = { | |
51 | { .time = 4000, .idx = 0 }, | |
52 | { .time = 6000, .idx = 1 }, | |
53 | { .time = 8000, .idx = 2 }, | |
54 | { .time = 10000, .idx = 3 }, | |
55 | }; | |
56 | ||
57 | struct axp20x_pek_ext_attr { | |
58 | const struct axp20x_time *p_time; | |
59 | unsigned int mask; | |
60 | }; | |
61 | ||
62 | static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = { | |
63 | .p_time = startup_time, | |
64 | .mask = AXP20X_PEK_STARTUP_MASK, | |
65 | }; | |
66 | ||
67 | static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = { | |
68 | .p_time = shutdown_time, | |
69 | .mask = AXP20X_PEK_SHUTDOWN_MASK, | |
70 | }; | |
71 | ||
72 | static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr) | |
73 | { | |
74 | return container_of(attr, struct dev_ext_attribute, attr)->var; | |
75 | } | |
76 | ||
77 | static ssize_t axp20x_show_ext_attr(struct device *dev, | |
78 | struct device_attribute *attr, char *buf) | |
79 | { | |
80 | struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); | |
81 | struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr); | |
82 | unsigned int val; | |
83 | int ret, i; | |
84 | ||
85 | ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val); | |
86 | if (ret != 0) | |
87 | return ret; | |
88 | ||
89 | val &= axp20x_ea->mask; | |
90 | val >>= ffs(axp20x_ea->mask) - 1; | |
91 | ||
92 | for (i = 0; i < 4; i++) | |
93 | if (val == axp20x_ea->p_time[i].idx) | |
94 | val = axp20x_ea->p_time[i].time; | |
95 | ||
96 | return sprintf(buf, "%u\n", val); | |
97 | } | |
98 | ||
99 | static ssize_t axp20x_store_ext_attr(struct device *dev, | |
100 | struct device_attribute *attr, | |
101 | const char *buf, size_t count) | |
102 | { | |
103 | struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev); | |
104 | struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr); | |
105 | char val_str[20]; | |
106 | size_t len; | |
107 | int ret, i; | |
108 | unsigned int val, idx = 0; | |
109 | unsigned int best_err = UINT_MAX; | |
110 | ||
111 | val_str[sizeof(val_str) - 1] = '\0'; | |
112 | strncpy(val_str, buf, sizeof(val_str) - 1); | |
113 | len = strlen(val_str); | |
114 | ||
115 | if (len && val_str[len - 1] == '\n') | |
116 | val_str[len - 1] = '\0'; | |
117 | ||
118 | ret = kstrtouint(val_str, 10, &val); | |
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | for (i = 3; i >= 0; i--) { | |
123 | unsigned int err; | |
124 | ||
125 | err = abs(axp20x_ea->p_time[i].time - val); | |
126 | if (err < best_err) { | |
127 | best_err = err; | |
128 | idx = axp20x_ea->p_time[i].idx; | |
129 | } | |
130 | ||
131 | if (!err) | |
132 | break; | |
133 | } | |
134 | ||
135 | idx <<= ffs(axp20x_ea->mask) - 1; | |
136 | ret = regmap_update_bits(axp20x_pek->axp20x->regmap, | |
137 | AXP20X_PEK_KEY, | |
138 | axp20x_ea->mask, idx); | |
139 | if (ret != 0) | |
140 | return -EINVAL; | |
b388de88 | 141 | |
5b6c26a9 CC |
142 | return count; |
143 | } | |
144 | ||
145 | static struct dev_ext_attribute axp20x_dev_attr_startup = { | |
146 | .attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr), | |
b388de88 | 147 | .var = &axp20x_pek_startup_ext_attr, |
5b6c26a9 CC |
148 | }; |
149 | ||
150 | static struct dev_ext_attribute axp20x_dev_attr_shutdown = { | |
151 | .attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr), | |
b388de88 DT |
152 | .var = &axp20x_pek_shutdown_ext_attr, |
153 | }; | |
154 | ||
155 | static struct attribute *axp20x_attributes[] = { | |
156 | &axp20x_dev_attr_startup.attr.attr, | |
157 | &axp20x_dev_attr_shutdown.attr.attr, | |
158 | NULL, | |
159 | }; | |
160 | ||
161 | static const struct attribute_group axp20x_attribute_group = { | |
162 | .attrs = axp20x_attributes, | |
5b6c26a9 CC |
163 | }; |
164 | ||
165 | static irqreturn_t axp20x_pek_irq(int irq, void *pwr) | |
166 | { | |
167 | struct input_dev *idev = pwr; | |
168 | struct axp20x_pek *axp20x_pek = input_get_drvdata(idev); | |
169 | ||
eeeee40f HG |
170 | /* |
171 | * The power-button is connected to ground so a falling edge (dbf) | |
172 | * means it is pressed. | |
173 | */ | |
174 | if (irq == axp20x_pek->irq_dbf) | |
5b6c26a9 | 175 | input_report_key(idev, KEY_POWER, true); |
eeeee40f | 176 | else if (irq == axp20x_pek->irq_dbr) |
5b6c26a9 CC |
177 | input_report_key(idev, KEY_POWER, false); |
178 | ||
179 | input_sync(idev); | |
180 | ||
181 | return IRQ_HANDLED; | |
182 | } | |
183 | ||
b388de88 DT |
184 | static void axp20x_remove_sysfs_group(void *_data) |
185 | { | |
186 | struct device *dev = _data; | |
187 | ||
188 | sysfs_remove_group(&dev->kobj, &axp20x_attribute_group); | |
189 | } | |
190 | ||
5b6c26a9 CC |
191 | static int axp20x_pek_probe(struct platform_device *pdev) |
192 | { | |
193 | struct axp20x_pek *axp20x_pek; | |
194 | struct axp20x_dev *axp20x; | |
195 | struct input_dev *idev; | |
196 | int error; | |
197 | ||
198 | axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek), | |
199 | GFP_KERNEL); | |
200 | if (!axp20x_pek) | |
201 | return -ENOMEM; | |
202 | ||
203 | axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent); | |
204 | axp20x = axp20x_pek->axp20x; | |
205 | ||
206 | axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR"); | |
207 | if (axp20x_pek->irq_dbr < 0) { | |
208 | dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n", | |
209 | axp20x_pek->irq_dbr); | |
210 | return axp20x_pek->irq_dbr; | |
211 | } | |
212 | axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc, | |
213 | axp20x_pek->irq_dbr); | |
214 | ||
215 | axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF"); | |
216 | if (axp20x_pek->irq_dbf < 0) { | |
217 | dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n", | |
218 | axp20x_pek->irq_dbf); | |
219 | return axp20x_pek->irq_dbf; | |
220 | } | |
221 | axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc, | |
222 | axp20x_pek->irq_dbf); | |
223 | ||
224 | axp20x_pek->input = devm_input_allocate_device(&pdev->dev); | |
225 | if (!axp20x_pek->input) | |
226 | return -ENOMEM; | |
227 | ||
228 | idev = axp20x_pek->input; | |
229 | ||
230 | idev->name = "axp20x-pek"; | |
231 | idev->phys = "m1kbd/input2"; | |
232 | idev->dev.parent = &pdev->dev; | |
233 | ||
234 | input_set_capability(idev, EV_KEY, KEY_POWER); | |
235 | ||
236 | input_set_drvdata(idev, axp20x_pek); | |
237 | ||
238 | error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr, | |
b388de88 DT |
239 | axp20x_pek_irq, 0, |
240 | "axp20x-pek-dbr", idev); | |
5b6c26a9 CC |
241 | if (error < 0) { |
242 | dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n", | |
243 | axp20x_pek->irq_dbr, error); | |
5b6c26a9 CC |
244 | return error; |
245 | } | |
246 | ||
247 | error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf, | |
248 | axp20x_pek_irq, 0, | |
249 | "axp20x-pek-dbf", idev); | |
250 | if (error < 0) { | |
251 | dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n", | |
252 | axp20x_pek->irq_dbf, error); | |
253 | return error; | |
254 | } | |
255 | ||
b388de88 DT |
256 | error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group); |
257 | if (error) { | |
258 | dev_err(axp20x->dev, "Failed to create sysfs attributes: %d\n", | |
259 | error); | |
5b6c26a9 | 260 | return error; |
b388de88 | 261 | } |
5b6c26a9 | 262 | |
b388de88 DT |
263 | error = devm_add_action(&pdev->dev, |
264 | axp20x_remove_sysfs_group, &pdev->dev); | |
265 | if (error) { | |
266 | axp20x_remove_sysfs_group(&pdev->dev); | |
267 | dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n", | |
268 | error); | |
269 | return error; | |
270 | } | |
5b6c26a9 CC |
271 | |
272 | error = input_register_device(idev); | |
273 | if (error) { | |
274 | dev_err(axp20x->dev, "Can't register input device: %d\n", | |
275 | error); | |
b388de88 | 276 | return error; |
5b6c26a9 CC |
277 | } |
278 | ||
279 | platform_set_drvdata(pdev, axp20x_pek); | |
280 | ||
5b6c26a9 CC |
281 | return 0; |
282 | } | |
283 | ||
284 | static struct platform_driver axp20x_pek_driver = { | |
285 | .probe = axp20x_pek_probe, | |
5b6c26a9 CC |
286 | .driver = { |
287 | .name = "axp20x-pek", | |
288 | }, | |
289 | }; | |
290 | module_platform_driver(axp20x_pek_driver); | |
291 | ||
292 | MODULE_DESCRIPTION("axp20x Power Button"); | |
293 | MODULE_AUTHOR("Carlo Caione <carlo@caione.org>"); | |
294 | MODULE_LICENSE("GPL"); | |
b6e26546 | 295 | MODULE_ALIAS("platform:axp20x-pek"); |