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266 lines · 7.2 KiB

1/*
2 * Copyright (C) 2011 Philippe Rétornaz
3 *
4 * Based on twl4030-pwrbutton driver by:
5 * Peter De Schrijver <[email protected]>
6 * Felipe Balbi <[email protected]>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file "COPYING" in the main directory of this
10 * archive for more details.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
20 */
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/input.h>
26#include <linux/interrupt.h>
27#include <linux/platform_device.h>
28#include <linux/mfd/mc13783.h>
29#include <linux/sched.h>
30#include <linux/slab.h>
31
32struct mc13783_pwrb {
33 struct input_dev *pwr;
34 struct mc13xxx *mc13783;
35#define MC13783_PWRB_B1_POL_INVERT (1 << 0)
36#define MC13783_PWRB_B2_POL_INVERT (1 << 1)
37#define MC13783_PWRB_B3_POL_INVERT (1 << 2)
38 int flags;
39 unsigned short keymap[3];
40};
41
42#define MC13783_REG_INTERRUPT_SENSE_1 5
43#define MC13783_IRQSENSE1_ONOFD1S (1 << 3)
44#define MC13783_IRQSENSE1_ONOFD2S (1 << 4)
45#define MC13783_IRQSENSE1_ONOFD3S (1 << 5)
46
47#define MC13783_REG_POWER_CONTROL_2 15
48#define MC13783_POWER_CONTROL_2_ON1BDBNC 4
49#define MC13783_POWER_CONTROL_2_ON2BDBNC 6
50#define MC13783_POWER_CONTROL_2_ON3BDBNC 8
51#define MC13783_POWER_CONTROL_2_ON1BRSTEN (1 << 1)
52#define MC13783_POWER_CONTROL_2_ON2BRSTEN (1 << 2)
53#define MC13783_POWER_CONTROL_2_ON3BRSTEN (1 << 3)
54
55static irqreturn_t button_irq(int irq, void *_priv)
56{
57 struct mc13783_pwrb *priv = _priv;
58 int val;
59
60 mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
61
62 switch (irq) {
63 case MC13783_IRQ_ONOFD1:
64 val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
65 if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
66 val ^= 1;
67 input_report_key(priv->pwr, priv->keymap[0], val);
68 break;
69
70 case MC13783_IRQ_ONOFD2:
71 val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
72 if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
73 val ^= 1;
74 input_report_key(priv->pwr, priv->keymap[1], val);
75 break;
76
77 case MC13783_IRQ_ONOFD3:
78 val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
79 if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
80 val ^= 1;
81 input_report_key(priv->pwr, priv->keymap[2], val);
82 break;
83 }
84
85 input_sync(priv->pwr);
86
87 return IRQ_HANDLED;
88}
89
90static int mc13783_pwrbutton_probe(struct platform_device *pdev)
91{
92 const struct mc13xxx_buttons_platform_data *pdata;
93 struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
94 struct input_dev *pwr;
95 struct mc13783_pwrb *priv;
96 int err = 0;
97 int reg = 0;
98
99 pdata = dev_get_platdata(&pdev->dev);
100 if (!pdata) {
101 dev_err(&pdev->dev, "missing platform data\n");
102 return -ENODEV;
103 }
104
105 pwr = input_allocate_device();
106 if (!pwr) {
107 dev_dbg(&pdev->dev, "Can't allocate power button\n");
108 return -ENOMEM;
109 }
110
111 priv = kzalloc_obj(*priv);
112 if (!priv) {
113 err = -ENOMEM;
114 dev_dbg(&pdev->dev, "Can't allocate power button\n");
115 goto free_input_dev;
116 }
117
118 reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
119 reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
120 reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
121
122 priv->pwr = pwr;
123 priv->mc13783 = mc13783;
124
125 mc13xxx_lock(mc13783);
126
127 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
128 priv->keymap[0] = pdata->b1on_key;
129 if (pdata->b1on_key != KEY_RESERVED)
130 __set_bit(pdata->b1on_key, pwr->keybit);
131
132 if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
133 priv->flags |= MC13783_PWRB_B1_POL_INVERT;
134
135 if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
136 reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
137
138 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
139 button_irq, "b1on", priv);
140 if (err) {
141 dev_dbg(&pdev->dev, "Can't request irq\n");
142 goto free_priv;
143 }
144 }
145
146 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
147 priv->keymap[1] = pdata->b2on_key;
148 if (pdata->b2on_key != KEY_RESERVED)
149 __set_bit(pdata->b2on_key, pwr->keybit);
150
151 if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
152 priv->flags |= MC13783_PWRB_B2_POL_INVERT;
153
154 if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
155 reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
156
157 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
158 button_irq, "b2on", priv);
159 if (err) {
160 dev_dbg(&pdev->dev, "Can't request irq\n");
161 goto free_irq_b1;
162 }
163 }
164
165 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
166 priv->keymap[2] = pdata->b3on_key;
167 if (pdata->b3on_key != KEY_RESERVED)
168 __set_bit(pdata->b3on_key, pwr->keybit);
169
170 if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
171 priv->flags |= MC13783_PWRB_B3_POL_INVERT;
172
173 if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
174 reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
175
176 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
177 button_irq, "b3on", priv);
178 if (err) {
179 dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
180 goto free_irq_b2;
181 }
182 }
183
184 mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
185
186 mc13xxx_unlock(mc13783);
187
188 pwr->name = "mc13783_pwrbutton";
189 pwr->phys = "mc13783_pwrbutton/input0";
190 pwr->dev.parent = &pdev->dev;
191
192 pwr->keycode = priv->keymap;
193 pwr->keycodemax = ARRAY_SIZE(priv->keymap);
194 pwr->keycodesize = sizeof(priv->keymap[0]);
195 __set_bit(EV_KEY, pwr->evbit);
196
197 err = input_register_device(pwr);
198 if (err) {
199 dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
200 goto free_irq;
201 }
202
203 platform_set_drvdata(pdev, priv);
204
205 return 0;
206
207free_irq:
208 mc13xxx_lock(mc13783);
209
210 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
211 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
212
213free_irq_b2:
214 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
215 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
216
217free_irq_b1:
218 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
219 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
220
221free_priv:
222 mc13xxx_unlock(mc13783);
223 kfree(priv);
224
225free_input_dev:
226 input_free_device(pwr);
227
228 return err;
229}
230
231static void mc13783_pwrbutton_remove(struct platform_device *pdev)
232{
233 struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
234 const struct mc13xxx_buttons_platform_data *pdata;
235
236 pdata = dev_get_platdata(&pdev->dev);
237
238 mc13xxx_lock(priv->mc13783);
239
240 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
241 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
242 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
243 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
244 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
245 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
246
247 mc13xxx_unlock(priv->mc13783);
248
249 input_unregister_device(priv->pwr);
250 kfree(priv);
251}
252
253static struct platform_driver mc13783_pwrbutton_driver = {
254 .probe = mc13783_pwrbutton_probe,
255 .remove = mc13783_pwrbutton_remove,
256 .driver = {
257 .name = "mc13783-pwrbutton",
258 },
259};
260
261module_platform_driver(mc13783_pwrbutton_driver);
262
263MODULE_ALIAS("platform:mc13783-pwrbutton");
264MODULE_DESCRIPTION("MC13783 Power Button");
265MODULE_LICENSE("GPL v2");
266MODULE_AUTHOR("Philippe Retornaz");