Input: introduce lm8323 keypad driver

	  To compile this driver as a module, choose M here: the

	  module will be called jornada720_kbd.

config KEYBOARD_LM8323

	tristate "LM8323 keypad chip"

	depends on I2C

	depends on LEDS_CLASS

	help

	  If you say yes here you get support for the National Semiconductor

	  LM8323 keypad controller.

	  To compile this driver as a module, choose M here: the

	  module will be called lm8323.

config KEYBOARD_OMAP

	tristate "TI OMAP keypad support"

	depends on (ARCH_OMAP1 || ARCH_OMAP2)

	  To compile this driver as a module, choose M here: the

	  module will be called sh_keysc.

+

config KEYBOARD_EP93XX

	tristate "EP93xx Matrix Keypad support"

	depends on ARCH_EP93XX

obj-$(CONFIG_KEYBOARD_TOSA)		+= tosakbd.o

obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o

obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o

obj-$(CONFIG_KEYBOARD_LM8323)		+= lm8323.o

obj-$(CONFIG_KEYBOARD_OMAP)		+= omap-keypad.o

obj-$(CONFIG_KEYBOARD_PXA27x)		+= pxa27x_keypad.o

obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)	+= pxa930_rotary.o

/*

 * drivers/i2c/chips/lm8323.c

 *

 * Copyright (C) 2007-2009 Nokia Corporation

 *

 * Written by Daniel Stone <daniel.stone@nokia.com>

 *            Timo O. Karjalainen <timo.o.karjalainen@nokia.com>

 *

 * Updated by Felipe Balbi <felipe.balbi@nokia.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation (version 2 of the License only).

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/sched.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/input.h>

#include <linux/leds.h>

#include <linux/i2c/lm8323.h>

/* Commands to send to the chip. */

#define LM8323_CMD_READ_ID		0x80 /* Read chip ID. */

#define LM8323_CMD_WRITE_CFG		0x81 /* Set configuration item. */

#define LM8323_CMD_READ_INT		0x82 /* Get interrupt status. */

#define LM8323_CMD_RESET		0x83 /* Reset, same as external one */

#define LM8323_CMD_WRITE_PORT_SEL	0x85 /* Set GPIO in/out. */

#define LM8323_CMD_WRITE_PORT_STATE	0x86 /* Set GPIO pullup. */

#define LM8323_CMD_READ_PORT_SEL	0x87 /* Get GPIO in/out. */

#define LM8323_CMD_READ_PORT_STATE	0x88 /* Get GPIO pullup. */

#define LM8323_CMD_READ_FIFO		0x89 /* Read byte from FIFO. */

#define LM8323_CMD_RPT_READ_FIFO	0x8a /* Read FIFO (no increment). */

#define LM8323_CMD_SET_ACTIVE		0x8b /* Set active time. */

#define LM8323_CMD_READ_ERR		0x8c /* Get error status. */

#define LM8323_CMD_READ_ROTATOR		0x8e /* Read rotator status. */

#define LM8323_CMD_SET_DEBOUNCE		0x8f /* Set debouncing time. */

#define LM8323_CMD_SET_KEY_SIZE		0x90 /* Set keypad size. */

#define LM8323_CMD_READ_KEY_SIZE	0x91 /* Get keypad size. */

#define LM8323_CMD_READ_CFG		0x92 /* Get configuration item. */

#define LM8323_CMD_WRITE_CLOCK		0x93 /* Set clock config. */

#define LM8323_CMD_READ_CLOCK		0x94 /* Get clock config. */

#define LM8323_CMD_PWM_WRITE		0x95 /* Write PWM script. */

#define LM8323_CMD_START_PWM		0x96 /* Start PWM engine. */

#define LM8323_CMD_STOP_PWM		0x97 /* Stop PWM engine. */

/* Interrupt status. */

#define INT_KEYPAD			0x01 /* Key event. */

#define INT_ROTATOR			0x02 /* Rotator event. */

#define INT_ERROR			0x08 /* Error: use CMD_READ_ERR. */

#define INT_NOINIT			0x10 /* Lost configuration. */

#define INT_PWM1			0x20 /* PWM1 stopped. */

#define INT_PWM2			0x40 /* PWM2 stopped. */

#define INT_PWM3			0x80 /* PWM3 stopped. */

/* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */

#define ERR_BADPAR			0x01 /* Bad parameter. */

#define ERR_CMDUNK			0x02 /* Unknown command. */

#define ERR_KEYOVR			0x04 /* Too many keys pressed. */

#define ERR_FIFOOVER			0x40 /* FIFO overflow. */

/* Configuration keys (CMD_{WRITE,READ}_CFG). */

#define CFG_MUX1SEL			0x01 /* Select MUX1_OUT input. */

#define CFG_MUX1EN			0x02 /* Enable MUX1_OUT. */

#define CFG_MUX2SEL			0x04 /* Select MUX2_OUT input. */

#define CFG_MUX2EN			0x08 /* Enable MUX2_OUT. */

#define CFG_PSIZE			0x20 /* Package size (must be 0). */

#define CFG_ROTEN			0x40 /* Enable rotator. */

/* Clock settings (CMD_{WRITE,READ}_CLOCK). */

#define CLK_RCPWM_INTERNAL		0x00

#define CLK_RCPWM_EXTERNAL		0x03

#define CLK_SLOWCLKEN			0x08 /* Enable 32.768kHz clock. */

#define CLK_SLOWCLKOUT			0x40 /* Enable slow pulse output. */

/* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */

#define LM8323_I2C_ADDR00		(0x84 >> 1)	/* 1000 010x */

#define LM8323_I2C_ADDR01		(0x86 >> 1)	/* 1000 011x */

#define LM8323_I2C_ADDR10		(0x88 >> 1)	/* 1000 100x */

#define LM8323_I2C_ADDR11		(0x8A >> 1)	/* 1000 101x */

/* Key event fifo length */

#define LM8323_FIFO_LEN			15

/* Commands for PWM engine; feed in with PWM_WRITE. */

/* Load ramp counter from duty cycle field (range 0 - 0xff). */

#define PWM_SET(v)			(0x4000 | ((v) & 0xff))

/* Go to start of script. */

#define PWM_GOTOSTART			0x0000

/*

 * Stop engine (generates interrupt).  If reset is 1, clear the program

 * counter, else leave it.

 */

#define PWM_END(reset)			(0xc000 | (!!(reset) << 11))

/*

 * Ramp.  If s is 1, divide clock by 512, else divide clock by 16.

 * Take t clock scales (up to 63) per step, for n steps (up to 126).

 * If u is set, ramp up, else ramp down.

 */

#define PWM_RAMP(s, t, n, u)		((!!(s) << 14) | ((t) & 0x3f) << 8 | \

					 ((n) & 0x7f) | ((u) ? 0 : 0x80))

/*

 * Loop (i.e. jump back to pos) for a given number of iterations (up to 63).

 * If cnt is zero, execute until PWM_END is encountered.

 */

#define PWM_LOOP(cnt, pos)		(0xa000 | (((cnt) & 0x3f) << 7) | \

					 ((pos) & 0x3f))

/*

 * Wait for trigger.  Argument is a mask of channels, shifted by the channel

 * number, e.g. 0xa for channels 3 and 1.  Note that channels are numbered

 * from 1, not 0.

 */

#define PWM_WAIT_TRIG(chans)		(0xe000 | (((chans) & 0x7) << 6))

/* Send trigger.  Argument is same as PWM_WAIT_TRIG. */

#define PWM_SEND_TRIG(chans)		(0xe000 | ((chans) & 0x7))

struct lm8323_pwm {

	int			id;

	int			fade_time;

	int			brightness;

	int			desired_brightness;

	bool			enabled;

	bool			running;

	/* pwm lock */

	struct mutex		lock;

	struct work_struct	work;

	struct led_classdev	cdev;

	struct lm8323_chip	*chip;

};

struct lm8323_chip {

	/* device lock */

	struct mutex		lock;

	struct i2c_client	*client;

	struct work_struct	work;

	struct input_dev	*idev;

	bool			kp_enabled;

	bool			pm_suspend;

	unsigned		keys_down;

	char			phys[32];

	unsigned short		keymap[LM8323_KEYMAP_SIZE];

	int			size_x;

	int			size_y;

	int			debounce_time;

	int			active_time;

	struct lm8323_pwm	pwm[LM8323_NUM_PWMS];

};

#define client_to_lm8323(c)	container_of(c, struct lm8323_chip, client)

#define dev_to_lm8323(d)	container_of(d, struct lm8323_chip, client->dev)

#define work_to_lm8323(w)	container_of(w, struct lm8323_chip, work)

#define cdev_to_pwm(c)		container_of(c, struct lm8323_pwm, cdev)

#define work_to_pwm(w)		container_of(w, struct lm8323_pwm, work)

#define LM8323_MAX_DATA 8

/*

 * To write, we just access the chip's address in write mode, and dump the

 * command and data out on the bus.  The command byte and data are taken as

 * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.

 */

static int lm8323_write(struct lm8323_chip *lm, int len, ...)

{

	int ret, i;

	va_list ap;

	u8 data[LM8323_MAX_DATA];

	va_start(ap, len);

	if (unlikely(len > LM8323_MAX_DATA)) {

		dev_err(&lm->client->dev, "tried to send %d bytes\n", len);

		va_end(ap);

		return 0;

	}

	for (i = 0; i < len; i++)

		data[i] = va_arg(ap, int);

	va_end(ap);

	/*

	 * If the host is asleep while we send the data, we can get a NACK

	 * back while it wakes up, so try again, once.

	 */

	ret = i2c_master_send(lm->client, data, len);

	if (unlikely(ret == -EREMOTEIO))

		ret = i2c_master_send(lm->client, data, len);

	if (unlikely(ret != len))

		dev_err(&lm->client->dev, "sent %d bytes of %d total\n",

			len, ret);

	return ret;

}

/*

 * To read, we first send the command byte to the chip and end the transaction,

 * then access the chip in read mode, at which point it will send the data.

 */

static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)

{

	int ret;

	/*

	 * If the host is asleep while we send the byte, we can get a NACK

	 * back while it wakes up, so try again, once.

	 */

	ret = i2c_master_send(lm->client, &cmd, 1);

	if (unlikely(ret == -EREMOTEIO))

		ret = i2c_master_send(lm->client, &cmd, 1);

	if (unlikely(ret != 1)) {

		dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",

			cmd);

		return 0;

	}

	ret = i2c_master_recv(lm->client, buf, len);

	if (unlikely(ret != len))

		dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",

			len, ret);

	return ret;

}

/*

 * Set the chip active time (idle time before it enters halt).

 */

static void lm8323_set_active_time(struct lm8323_chip *lm, int time)

{

	lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);

}

/*

 * The signals are AT-style: the low 7 bits are the keycode, and the top

 * bit indicates the state (1 for down, 0 for up).

 */

static inline u8 lm8323_whichkey(u8 event)

{

	return event & 0x7f;

}

static inline int lm8323_ispress(u8 event)

{

	return (event & 0x80) ? 1 : 0;

}

static void process_keys(struct lm8323_chip *lm)

{

	u8 event;

	u8 key_fifo[LM8323_FIFO_LEN + 1];

	int old_keys_down = lm->keys_down;

	int ret;

	int i = 0;

	/*

	 * Read all key events from the FIFO at once. Next READ_FIFO clears the

	 * FIFO even if we didn't read all events previously.

	 */

	ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);

	if (ret < 0) {

		dev_err(&lm->client->dev, "Failed reading fifo \n");

		return;

	}

	key_fifo[ret] = 0;

	while ((event = key_fifo[i++])) {

		u8 key = lm8323_whichkey(event);

		int isdown = lm8323_ispress(event);

		unsigned short keycode = lm->keymap[key];

		dev_vdbg(&lm->client->dev, "key 0x%02x %s\n",

			 key, isdown ? "down" : "up");

		if (lm->kp_enabled) {

			input_event(lm->idev, EV_MSC, MSC_SCAN, key);

			input_report_key(lm->idev, keycode, isdown);

			input_sync(lm->idev);

		}

		if (isdown)

			lm->keys_down++;

		else

			lm->keys_down--;

	}

	/*

	 * Errata: We need to ensure that the chip never enters halt mode

	 * during a keypress, so set active time to 0.  When it's released,

	 * we can enter halt again, so set the active time back to normal.

	 */

	if (!old_keys_down && lm->keys_down)

		lm8323_set_active_time(lm, 0);

	if (old_keys_down && !lm->keys_down)

		lm8323_set_active_time(lm, lm->active_time);

}

static void lm8323_process_error(struct lm8323_chip *lm)

{

	u8 error;

	if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {

		if (error & ERR_FIFOOVER)

			dev_vdbg(&lm->client->dev, "fifo overflow!\n");

		if (error & ERR_KEYOVR)

			dev_vdbg(&lm->client->dev,

					"more than two keys pressed\n");

		if (error & ERR_CMDUNK)

			dev_vdbg(&lm->client->dev,

					"unknown command submitted\n");

		if (error & ERR_BADPAR)

			dev_vdbg(&lm->client->dev, "bad command parameter\n");

	}

}

static void lm8323_reset(struct lm8323_chip *lm)

{

	/* The docs say we must pass 0xAA as the data byte. */

	lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);

}

static int lm8323_configure(struct lm8323_chip *lm)

{

	int keysize = (lm->size_x << 4) | lm->size_y;

	int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);

	int debounce = lm->debounce_time >> 2;

	int active = lm->active_time >> 2;

	/*

	 * Active time must be greater than the debounce time: if it's

	 * a close-run thing, give ourselves a 12ms buffer.

	 */

	if (debounce >= active)

		active = debounce + 3;

	lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);

	lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);

	lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);

	lm8323_set_active_time(lm, lm->active_time);

	lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);

	lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);

	lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);

	/*

	 * Not much we can do about errors at this point, so just hope

	 * for the best.

	 */

	return 0;

}

static void pwm_done(struct lm8323_pwm *pwm)

{

	mutex_lock(&pwm->lock);

	pwm->running = false;

	if (pwm->desired_brightness != pwm->brightness)

		schedule_work(&pwm->work);

	mutex_unlock(&pwm->lock);

}

/*

 * Bottom half: handle the interrupt by posting key events, or dealing with

 * errors appropriately.

 */

static void lm8323_work(struct work_struct *work)

{

	struct lm8323_chip *lm = work_to_lm8323(work);

	u8 ints;

	int i;

	mutex_lock(&lm->lock);

	while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {

		if (likely(ints & INT_KEYPAD))

			process_keys(lm);

		if (ints & INT_ROTATOR) {

			/* We don't currently support the rotator. */

			dev_vdbg(&lm->client->dev, "rotator fired\n");

		}

		if (ints & INT_ERROR) {

			dev_vdbg(&lm->client->dev, "error!\n");

			lm8323_process_error(lm);

		}

		if (ints & INT_NOINIT) {

			dev_err(&lm->client->dev, "chip lost config; "

						  "reinitialising\n");

			lm8323_configure(lm);

		}

		for (i = 0; i < LM8323_NUM_PWMS; i++) {

			if (ints & (1 << (INT_PWM1 + i))) {

				dev_vdbg(&lm->client->dev,

					 "pwm%d engine completed\n", i);

				pwm_done(&lm->pwm[i]);

			}

		}

	}

	mutex_unlock(&lm->lock);

}

/*

 * We cannot use I2C in interrupt context, so we just schedule work.

 */

static irqreturn_t lm8323_irq(int irq, void *data)

{

	struct lm8323_chip *lm = data;

	schedule_work(&lm->work);

	return IRQ_HANDLED;

}

/*

 * Read the chip ID.

 */

static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)

{

	int bytes;

	bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);

	if (unlikely(bytes != 2))

		return -EIO;

	return 0;

}

static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)

{

	lm8323_write(pwm->chip, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,

		     (cmd & 0xff00) >> 8, cmd & 0x00ff);

}

/*

 * Write a script into a given PWM engine, concluding with PWM_END.

 * If 'kill' is nonzero, the engine will be shut down at the end

 * of the script, producing a zero output. Otherwise the engine

 * will be kept running at the final PWM level indefinitely.

 */

static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill,

			     int len, const u16 *cmds)

{

	int i;

	for (i = 0; i < len; i++)

		lm8323_write_pwm_one(pwm, i, cmds[i]);

	lm8323_write_pwm_one(pwm, i++, PWM_END(kill));

	lm8323_write(pwm->chip, 2, LM8323_CMD_START_PWM, pwm->id);

	pwm->running = true;

}

static void lm8323_pwm_work(struct work_struct *work)

{

	struct lm8323_pwm *pwm = work_to_pwm(work);

	int div512, perstep, steps, hz, up, kill;

	u16 pwm_cmds[3];

	int num_cmds = 0;

	mutex_lock(&pwm->lock);

	/*

	 * Do nothing if we're already at the requested level,

	 * or previous setting is not yet complete. In the latter

	 * case we will be called again when the previous PWM script

	 * finishes.

	 */

	if (pwm->running || pwm->desired_brightness == pwm->brightness)

		goto out;

	kill = (pwm->desired_brightness == 0);

	up = (pwm->desired_brightness > pwm->brightness);

	steps = abs(pwm->desired_brightness - pwm->brightness);

	/*

	 * Convert time (in ms) into a divisor (512 or 16 on a refclk of

	 * 32768Hz), and number of ticks per step.

	 */

	if ((pwm->fade_time / steps) > (32768 / 512)) {

		div512 = 1;

		hz = 32768 / 512;

	} else {

		div512 = 0;

		hz = 32768 / 16;

	}

	perstep = (hz * pwm->fade_time) / (steps * 1000);

	if (perstep == 0)

		perstep = 1;

	else if (perstep > 63)

		perstep = 63;

	while (steps) {

		int s;

		s = min(126, steps);

		pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up);

		steps -= s;

	}

	lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds);

	pwm->brightness = pwm->desired_brightness;

 out:

	mutex_unlock(&pwm->lock);

}

static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,

				      enum led_brightness brightness)

{

	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);

	struct lm8323_chip *lm = pwm->chip;

	mutex_lock(&pwm->lock);

	pwm->desired_brightness = brightness;

	mutex_unlock(&pwm->lock);

	if (in_interrupt()) {

		schedule_work(&pwm->work);

	} else {

		/*

		 * Schedule PWM work as usual unless we are going into suspend

		 */

		mutex_lock(&lm->lock);

		if (likely(!lm->pm_suspend))

			schedule_work(&pwm->work);

		else

			lm8323_pwm_work(&pwm->work);

		mutex_unlock(&lm->lock);

	}

}

static ssize_t lm8323_pwm_show_time(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);

	return sprintf(buf, "%d\n", pwm->fade_time);

}

static ssize_t lm8323_pwm_store_time(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t len)

{

	struct led_classdev *led_cdev = dev_get_drvdata(dev);

	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);

	int ret;

	unsigned long time;

	ret = strict_strtoul(buf, 10, &time);

	/* Numbers only, please. */

	if (ret)

		return -EINVAL;

	pwm->fade_time = time;

	return strlen(buf);

}

static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);

static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,

		    const char *name)

{

	struct lm8323_pwm *pwm;

	BUG_ON(id > 3);

	pwm = &lm->pwm[id - 1];

	pwm->id = id;

	pwm->fade_time = 0;

	pwm->brightness = 0;

	pwm->desired_brightness = 0;

	pwm->running = false;

	pwm->enabled = false;

	INIT_WORK(&pwm->work, lm8323_pwm_work);

	mutex_init(&pwm->lock);

	pwm->chip = lm;

	if (name) {

		pwm->cdev.name = name;

		pwm->cdev.brightness_set = lm8323_pwm_set_brightness;

		if (led_classdev_register(dev, &pwm->cdev) < 0) {

			dev_err(dev, "couldn't register PWM %d\n", id);

			return -1;

		}

		if (device_create_file(pwm->cdev.dev,

					&dev_attr_time) < 0) {

			dev_err(dev, "couldn't register time attribute\n");

			led_classdev_unregister(&pwm->cdev);

			return -1;

		}

		pwm->enabled = true;

	}

	return 0;

}

static struct i2c_driver lm8323_i2c_driver;

static ssize_t lm8323_show_disable(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	struct lm8323_chip *lm = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", !lm->kp_enabled);

}

static ssize_t lm8323_set_disable(struct device *dev,

				  struct device_attribute *attr,

				  const char *buf, size_t count)

{

	struct lm8323_chip *lm = dev_get_drvdata(dev);

	int ret;

	unsigned long i;

	ret = strict_strtoul(buf, 10, &i);

	mutex_lock(&lm->lock);

	lm->kp_enabled = !i;

	mutex_unlock(&lm->lock);

	return count;

}

static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);

static int __devinit lm8323_probe(struct i2c_client *client,

				  const struct i2c_device_id *id)

{

	struct lm8323_platform_data *pdata = client->dev.platform_data;

	struct input_dev *idev;

	struct lm8323_chip *lm;

	int i, err;

	unsigned long tmo;

	u8 data[2];

	if (!pdata || !pdata->size_x || !pdata->size_y) {

		dev_err(&client->dev, "missing platform_data\n");

		return -EINVAL;

	}

	if (pdata->size_x > 8) {

		dev_err(&client->dev, "invalid x size %d specified\n",

			pdata->size_x);

		return -EINVAL;

	}

	if (pdata->size_y > 12) {

		dev_err(&client->dev, "invalid y size %d specified\n",

			pdata->size_y);

		return -EINVAL;

	}

	lm = kzalloc(sizeof *lm, GFP_KERNEL);

	idev = input_allocate_device();

	if (!lm || !idev) {

		err = -ENOMEM;

		goto fail1;

	}

	i2c_set_clientdata(client, lm);

	lm->client = client;

	lm->idev = idev;

	mutex_init(&lm->lock);

	INIT_WORK(&lm->work, lm8323_work);

	lm->size_x = pdata->size_x;

	lm->size_y = pdata->size_y;

	dev_vdbg(&client->dev, "Keypad size: %d x %d\n",