1 /*
2 * Copyright (C) 2011 Philippe Rétornaz
3 *
4 * Based on twl4030-pwrbutton driver by:
5 * Peter De Schrijver <peter.de-schrijver@nokia.com>
6 * Felipe Balbi <felipe.balbi@nokia.com>
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
32 struct 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
button_irq(int irq,void * _priv)55 static irqreturn_t button_irq(int irq, void *_priv)
56 {
57 struct mc13783_pwrb *priv = _priv;
58 int val;
59
60 mc13xxx_irq_ack(priv->mc13783, irq);
61 mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
62
63 switch (irq) {
64 case MC13783_IRQ_ONOFD1:
65 val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
66 if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
67 val ^= 1;
68 input_report_key(priv->pwr, priv->keymap[0], val);
69 break;
70
71 case MC13783_IRQ_ONOFD2:
72 val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
73 if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
74 val ^= 1;
75 input_report_key(priv->pwr, priv->keymap[1], val);
76 break;
77
78 case MC13783_IRQ_ONOFD3:
79 val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
80 if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
81 val ^= 1;
82 input_report_key(priv->pwr, priv->keymap[2], val);
83 break;
84 }
85
86 input_sync(priv->pwr);
87
88 return IRQ_HANDLED;
89 }
90
mc13783_pwrbutton_probe(struct platform_device * pdev)91 static int mc13783_pwrbutton_probe(struct platform_device *pdev)
92 {
93 const struct mc13xxx_buttons_platform_data *pdata;
94 struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
95 struct input_dev *pwr;
96 struct mc13783_pwrb *priv;
97 int err = 0;
98 int reg = 0;
99
100 pdata = dev_get_platdata(&pdev->dev);
101 if (!pdata) {
102 dev_err(&pdev->dev, "missing platform data\n");
103 return -ENODEV;
104 }
105
106 pwr = input_allocate_device();
107 if (!pwr) {
108 dev_dbg(&pdev->dev, "Can't allocate power button\n");
109 return -ENOMEM;
110 }
111
112 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
113 if (!priv) {
114 err = -ENOMEM;
115 dev_dbg(&pdev->dev, "Can't allocate power button\n");
116 goto free_input_dev;
117 }
118
119 reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
120 reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
121 reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
122
123 priv->pwr = pwr;
124 priv->mc13783 = mc13783;
125
126 mc13xxx_lock(mc13783);
127
128 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
129 priv->keymap[0] = pdata->b1on_key;
130 if (pdata->b1on_key != KEY_RESERVED)
131 __set_bit(pdata->b1on_key, pwr->keybit);
132
133 if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
134 priv->flags |= MC13783_PWRB_B1_POL_INVERT;
135
136 if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
137 reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
138
139 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
140 button_irq, "b1on", priv);
141 if (err) {
142 dev_dbg(&pdev->dev, "Can't request irq\n");
143 goto free_priv;
144 }
145 }
146
147 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
148 priv->keymap[1] = pdata->b2on_key;
149 if (pdata->b2on_key != KEY_RESERVED)
150 __set_bit(pdata->b2on_key, pwr->keybit);
151
152 if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
153 priv->flags |= MC13783_PWRB_B2_POL_INVERT;
154
155 if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
156 reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
157
158 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
159 button_irq, "b2on", priv);
160 if (err) {
161 dev_dbg(&pdev->dev, "Can't request irq\n");
162 goto free_irq_b1;
163 }
164 }
165
166 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
167 priv->keymap[2] = pdata->b3on_key;
168 if (pdata->b3on_key != KEY_RESERVED)
169 __set_bit(pdata->b3on_key, pwr->keybit);
170
171 if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
172 priv->flags |= MC13783_PWRB_B3_POL_INVERT;
173
174 if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
175 reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
176
177 err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
178 button_irq, "b3on", priv);
179 if (err) {
180 dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
181 goto free_irq_b2;
182 }
183 }
184
185 mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
186
187 mc13xxx_unlock(mc13783);
188
189 pwr->name = "mc13783_pwrbutton";
190 pwr->phys = "mc13783_pwrbutton/input0";
191 pwr->dev.parent = &pdev->dev;
192
193 pwr->keycode = priv->keymap;
194 pwr->keycodemax = ARRAY_SIZE(priv->keymap);
195 pwr->keycodesize = sizeof(priv->keymap[0]);
196 __set_bit(EV_KEY, pwr->evbit);
197
198 err = input_register_device(pwr);
199 if (err) {
200 dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
201 goto free_irq;
202 }
203
204 platform_set_drvdata(pdev, priv);
205
206 return 0;
207
208 free_irq:
209 mc13xxx_lock(mc13783);
210
211 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
212 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
213
214 free_irq_b2:
215 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
216 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
217
218 free_irq_b1:
219 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
220 mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
221
222 free_priv:
223 mc13xxx_unlock(mc13783);
224 kfree(priv);
225
226 free_input_dev:
227 input_free_device(pwr);
228
229 return err;
230 }
231
mc13783_pwrbutton_remove(struct platform_device * pdev)232 static int mc13783_pwrbutton_remove(struct platform_device *pdev)
233 {
234 struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
235 const struct mc13xxx_buttons_platform_data *pdata;
236
237 pdata = dev_get_platdata(&pdev->dev);
238
239 mc13xxx_lock(priv->mc13783);
240
241 if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
242 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
243 if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
244 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
245 if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
246 mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
247
248 mc13xxx_unlock(priv->mc13783);
249
250 input_unregister_device(priv->pwr);
251 kfree(priv);
252
253 return 0;
254 }
255
256 static struct platform_driver mc13783_pwrbutton_driver = {
257 .probe = mc13783_pwrbutton_probe,
258 .remove = mc13783_pwrbutton_remove,
259 .driver = {
260 .name = "mc13783-pwrbutton",
261 },
262 };
263
264 module_platform_driver(mc13783_pwrbutton_driver);
265
266 MODULE_ALIAS("platform:mc13783-pwrbutton");
267 MODULE_DESCRIPTION("MC13783 Power Button");
268 MODULE_LICENSE("GPL v2");
269 MODULE_AUTHOR("Philippe Retornaz");
270