1/*
2 * Copyright (C) 2011 Philippe R��tornaz
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
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_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
91static 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
208free_irq:
209	mc13xxx_lock(mc13783);
210
211	if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
212		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
213
214free_irq_b2:
215	if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
216		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
217
218free_irq_b1:
219	if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
220		mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
221
222free_priv:
223	mc13xxx_unlock(mc13783);
224	kfree(priv);
225
226free_input_dev:
227	input_free_device(pwr);
228
229	return err;
230}
231
232static void 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
254static struct platform_driver mc13783_pwrbutton_driver = {
255	.probe		= mc13783_pwrbutton_probe,
256	.remove_new	= mc13783_pwrbutton_remove,
257	.driver		= {
258		.name	= "mc13783-pwrbutton",
259	},
260};
261
262module_platform_driver(mc13783_pwrbutton_driver);
263
264MODULE_ALIAS("platform:mc13783-pwrbutton");
265MODULE_DESCRIPTION("MC13783 Power Button");
266MODULE_LICENSE("GPL v2");
267MODULE_AUTHOR("Philippe Retornaz");
268