mc13783-pwrbutton.c

  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
 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(sizeof(*priv), GFP_KERNEL);
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");