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 
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 
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 
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