xref: /linux/drivers/input/misc/mc13783-pwrbutton.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
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/init.h>
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/input.h>
27 #include <linux/interrupt.h>
28 #include <linux/platform_device.h>
29 #include <linux/mfd/mc13783.h>
30 #include <linux/sched.h>
31 #include <linux/slab.h>
32 
33 struct mc13783_pwrb {
34 	struct input_dev *pwr;
35 	struct mc13xxx *mc13783;
36 #define MC13783_PWRB_B1_POL_INVERT	(1 << 0)
37 #define MC13783_PWRB_B2_POL_INVERT	(1 << 1)
38 #define MC13783_PWRB_B3_POL_INVERT	(1 << 2)
39 	int flags;
40 	unsigned short keymap[3];
41 };
42 
43 #define MC13783_REG_INTERRUPT_SENSE_1		5
44 #define MC13783_IRQSENSE1_ONOFD1S		(1 << 3)
45 #define MC13783_IRQSENSE1_ONOFD2S		(1 << 4)
46 #define MC13783_IRQSENSE1_ONOFD3S		(1 << 5)
47 
48 #define MC13783_REG_POWER_CONTROL_2		15
49 #define MC13783_POWER_CONTROL_2_ON1BDBNC	4
50 #define MC13783_POWER_CONTROL_2_ON2BDBNC	6
51 #define MC13783_POWER_CONTROL_2_ON3BDBNC	8
52 #define MC13783_POWER_CONTROL_2_ON1BRSTEN	(1 << 1)
53 #define MC13783_POWER_CONTROL_2_ON2BRSTEN	(1 << 2)
54 #define MC13783_POWER_CONTROL_2_ON3BRSTEN	(1 << 3)
55 
56 static irqreturn_t button_irq(int irq, void *_priv)
57 {
58 	struct mc13783_pwrb *priv = _priv;
59 	int val;
60 
61 	mc13xxx_irq_ack(priv->mc13783, irq);
62 	mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
63 
64 	switch (irq) {
65 	case MC13783_IRQ_ONOFD1:
66 		val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
67 		if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
68 			val ^= 1;
69 		input_report_key(priv->pwr, priv->keymap[0], val);
70 		break;
71 
72 	case MC13783_IRQ_ONOFD2:
73 		val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
74 		if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
75 			val ^= 1;
76 		input_report_key(priv->pwr, priv->keymap[1], val);
77 		break;
78 
79 	case MC13783_IRQ_ONOFD3:
80 		val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
81 		if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
82 			val ^= 1;
83 		input_report_key(priv->pwr, priv->keymap[2], val);
84 		break;
85 	}
86 
87 	input_sync(priv->pwr);
88 
89 	return IRQ_HANDLED;
90 }
91 
92 static int __devinit mc13783_pwrbutton_probe(struct platform_device *pdev)
93 {
94 	const struct mc13xxx_buttons_platform_data *pdata;
95 	struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
96 	struct input_dev *pwr;
97 	struct mc13783_pwrb *priv;
98 	int err = 0;
99 	int reg = 0;
100 
101 	pdata = dev_get_platdata(&pdev->dev);
102 	if (!pdata) {
103 		dev_err(&pdev->dev, "missing platform data\n");
104 		return -ENODEV;
105 	}
106 
107 	pwr = input_allocate_device();
108 	if (!pwr) {
109 		dev_dbg(&pdev->dev, "Can't allocate power button\n");
110 		return -ENOMEM;
111 	}
112 
113 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
114 	if (!priv) {
115 		err = -ENOMEM;
116 		dev_dbg(&pdev->dev, "Can't allocate power button\n");
117 		goto free_input_dev;
118 	}
119 
120 	reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
121 	reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
122 	reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
123 
124 	priv->pwr = pwr;
125 	priv->mc13783 = mc13783;
126 
127 	mc13xxx_lock(mc13783);
128 
129 	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
130 		priv->keymap[0] = pdata->b1on_key;
131 		if (pdata->b1on_key != KEY_RESERVED)
132 			__set_bit(pdata->b1on_key, pwr->keybit);
133 
134 		if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
135 			priv->flags |= MC13783_PWRB_B1_POL_INVERT;
136 
137 		if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
138 			reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
139 
140 		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
141 					  button_irq, "b1on", priv);
142 		if (err) {
143 			dev_dbg(&pdev->dev, "Can't request irq\n");
144 			goto free_priv;
145 		}
146 	}
147 
148 	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
149 		priv->keymap[1] = pdata->b2on_key;
150 		if (pdata->b2on_key != KEY_RESERVED)
151 			__set_bit(pdata->b2on_key, pwr->keybit);
152 
153 		if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
154 			priv->flags |= MC13783_PWRB_B2_POL_INVERT;
155 
156 		if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
157 			reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
158 
159 		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
160 					  button_irq, "b2on", priv);
161 		if (err) {
162 			dev_dbg(&pdev->dev, "Can't request irq\n");
163 			goto free_irq_b1;
164 		}
165 	}
166 
167 	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
168 		priv->keymap[2] = pdata->b3on_key;
169 		if (pdata->b3on_key != KEY_RESERVED)
170 			__set_bit(pdata->b3on_key, pwr->keybit);
171 
172 		if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
173 			priv->flags |= MC13783_PWRB_B3_POL_INVERT;
174 
175 		if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
176 			reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
177 
178 		err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
179 					  button_irq, "b3on", priv);
180 		if (err) {
181 			dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
182 			goto free_irq_b2;
183 		}
184 	}
185 
186 	mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
187 
188 	mc13xxx_unlock(mc13783);
189 
190 	pwr->name = "mc13783_pwrbutton";
191 	pwr->phys = "mc13783_pwrbutton/input0";
192 	pwr->dev.parent = &pdev->dev;
193 
194 	pwr->keycode = priv->keymap;
195 	pwr->keycodemax = ARRAY_SIZE(priv->keymap);
196 	pwr->keycodesize = sizeof(priv->keymap[0]);
197 	__set_bit(EV_KEY, pwr->evbit);
198 
199 	err = input_register_device(pwr);
200 	if (err) {
201 		dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
202 		goto free_irq;
203 	}
204 
205 	platform_set_drvdata(pdev, priv);
206 
207 	return 0;
208 
209 free_irq:
210 	mc13xxx_lock(mc13783);
211 
212 	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
213 		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
214 
215 free_irq_b2:
216 	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
217 		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
218 
219 free_irq_b1:
220 	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
221 		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
222 
223 free_priv:
224 	mc13xxx_unlock(mc13783);
225 	kfree(priv);
226 
227 free_input_dev:
228 	input_free_device(pwr);
229 
230 	return err;
231 }
232 
233 static int __devexit mc13783_pwrbutton_remove(struct platform_device *pdev)
234 {
235 	struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
236 	const struct mc13xxx_buttons_platform_data *pdata;
237 
238 	pdata = dev_get_platdata(&pdev->dev);
239 
240 	mc13xxx_lock(priv->mc13783);
241 
242 	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
243 		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
244 	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
245 		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
246 	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
247 		mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
248 
249 	mc13xxx_unlock(priv->mc13783);
250 
251 	input_unregister_device(priv->pwr);
252 	kfree(priv);
253 	platform_set_drvdata(pdev, NULL);
254 
255 	return 0;
256 }
257 
258 static struct platform_driver mc13783_pwrbutton_driver = {
259 	.probe		= mc13783_pwrbutton_probe,
260 	.remove		= __devexit_p(mc13783_pwrbutton_remove),
261 	.driver		= {
262 		.name	= "mc13783-pwrbutton",
263 		.owner	= THIS_MODULE,
264 	},
265 };
266 
267 module_platform_driver(mc13783_pwrbutton_driver);
268 
269 MODULE_ALIAS("platform:mc13783-pwrbutton");
270 MODULE_DESCRIPTION("MC13783 Power Button");
271 MODULE_LICENSE("GPL v2");
272 MODULE_AUTHOR("Philippe Retornaz");
273