[net-next-2.6.git] / drivers / gpio / twl4030-gpio.c

/*
 * twl4030_gpio.c -- access to GPIOs on TWL4030/TPS659x0 chips
 *
 * Copyright (C) 2006-2007 Texas Instruments, Inc.
 * Copyright (C) 2006 MontaVista Software, Inc.
 *
 * Code re-arranged and cleaned up by:
 *	Syed Mohammed Khasim <x0khasim@ti.com>
 *
 * Initial Code:
 *	Andy Lowe / Nishanth Menon
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/init.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>

#include <linux/i2c/twl.h>


/*
 * The GPIO "subchip" supports 18 GPIOs which can be configured as
 * inputs or outputs, with pullups or pulldowns on each pin.  Each
 * GPIO can trigger interrupts on either or both edges.
 *
 * GPIO interrupts can be fed to either of two IRQ lines; this is
 * intended to support multiple hosts.
 *
 * There are also two LED pins used sometimes as output-only GPIOs.
 */


static struct gpio_chip twl_gpiochip;
static int twl4030_gpio_irq_base;

/* genirq interfaces are not available to modules */
#ifdef MODULE
#define is_module()	true
#else
#define is_module()	false
#endif

/* GPIO_CTRL Fields */
#define MASK_GPIO_CTRL_GPIO0CD1		BIT(0)
#define MASK_GPIO_CTRL_GPIO1CD2		BIT(1)
#define MASK_GPIO_CTRL_GPIO_ON		BIT(2)

/* Mask for GPIO registers when aggregated into a 32-bit integer */
#define GPIO_32_MASK			0x0003ffff

/* Data structures */
static DEFINE_MUTEX(gpio_lock);

/* store usage of each GPIO. - each bit represents one GPIO */
static unsigned int gpio_usage_count;

/*----------------------------------------------------------------------*/

/*
 * To configure TWL4030 GPIO module registers
 */
static inline int gpio_twl4030_write(u8 address, u8 data)
{
	return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);
}

/*----------------------------------------------------------------------*/

/*
 * LED register offsets (use TWL4030_MODULE_{LED,PWMA,PWMB}))
 * PWMs A and B are dedicated to LEDs A and B, respectively.
 */

#define TWL4030_LED_LEDEN	0x0

/* LEDEN bits */
#define LEDEN_LEDAON		BIT(0)
#define LEDEN_LEDBON		BIT(1)
#define LEDEN_LEDAEXT		BIT(2)
#define LEDEN_LEDBEXT		BIT(3)
#define LEDEN_LEDAPWM		BIT(4)
#define LEDEN_LEDBPWM		BIT(5)
#define LEDEN_PWM_LENGTHA	BIT(6)
#define LEDEN_PWM_LENGTHB	BIT(7)

#define TWL4030_PWMx_PWMxON	0x0
#define TWL4030_PWMx_PWMxOFF	0x1

#define PWMxON_LENGTH		BIT(7)

/*----------------------------------------------------------------------*/

/*
 * To read a TWL4030 GPIO module register
 */
static inline int gpio_twl4030_read(u8 address)
{
	u8 data;
	int ret = 0;

	ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
	return (ret < 0) ? ret : data;
}

/*----------------------------------------------------------------------*/

static u8 cached_leden;		/* protected by gpio_lock */

/* The LED lines are open drain outputs ... a FET pulls to GND, so an
 * external pullup is needed.  We could also expose the integrated PWM
 * as a LED brightness control; we initialize it as "always on".
 */
static void twl4030_led_set_value(int led, int value)
{
	u8 mask = LEDEN_LEDAON | LEDEN_LEDAPWM;
	int status;

	if (led)
		mask <<= 1;

	mutex_lock(&gpio_lock);
	if (value)
		cached_leden &= ~mask;
	else
		cached_leden |= mask;
	status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
			TWL4030_LED_LEDEN);
	mutex_unlock(&gpio_lock);
}

static int twl4030_set_gpio_direction(int gpio, int is_input)
{
	u8 d_bnk = gpio >> 3;
	u8 d_msk = BIT(gpio & 0x7);
	u8 reg = 0;
	u8 base = REG_GPIODATADIR1 + d_bnk;
	int ret = 0;

	mutex_lock(&gpio_lock);
	ret = gpio_twl4030_read(base);
	if (ret >= 0) {
		if (is_input)
			reg = ret & ~d_msk;
		else
			reg = ret | d_msk;

		ret = gpio_twl4030_write(base, reg);
	}
	mutex_unlock(&gpio_lock);
	return ret;
}

static int twl4030_set_gpio_dataout(int gpio, int enable)
{
	u8 d_bnk = gpio >> 3;
	u8 d_msk = BIT(gpio & 0x7);
	u8 base = 0;

	if (enable)
		base = REG_SETGPIODATAOUT1 + d_bnk;
	else
		base = REG_CLEARGPIODATAOUT1 + d_bnk;

	return gpio_twl4030_write(base, d_msk);
}

static int twl4030_get_gpio_datain(int gpio)
{
	u8 d_bnk = gpio >> 3;
	u8 d_off = gpio & 0x7;
	u8 base = 0;
	int ret = 0;

	if (unlikely((gpio >= TWL4030_GPIO_MAX)
		|| !(gpio_usage_count & BIT(gpio))))
		return -EPERM;

	base = REG_GPIODATAIN1 + d_bnk;
	ret = gpio_twl4030_read(base);
	if (ret > 0)
		ret = (ret >> d_off) & 0x1;

	return ret;
}

/*----------------------------------------------------------------------*/

static int twl_request(struct gpio_chip *chip, unsigned offset)
{
	int status = 0;

	mutex_lock(&gpio_lock);

	/* Support the two LED outputs as output-only GPIOs. */
	if (offset >= TWL4030_GPIO_MAX) {
		u8	ledclr_mask = LEDEN_LEDAON | LEDEN_LEDAEXT
				| LEDEN_LEDAPWM | LEDEN_PWM_LENGTHA;
		u8	module = TWL4030_MODULE_PWMA;

		offset -= TWL4030_GPIO_MAX;
		if (offset) {
			ledclr_mask <<= 1;
			module = TWL4030_MODULE_PWMB;
		}

		/* initialize PWM to always-drive */
		status = twl_i2c_write_u8(module, 0x7f,
				TWL4030_PWMx_PWMxOFF);
		if (status < 0)
			goto done;
		status = twl_i2c_write_u8(module, 0x7f,
				TWL4030_PWMx_PWMxON);
		if (status < 0)
			goto done;

		/* init LED to not-driven (high) */
		module = TWL4030_MODULE_LED;
		status = twl_i2c_read_u8(module, &cached_leden,
				TWL4030_LED_LEDEN);
		if (status < 0)
			goto done;
		cached_leden &= ~ledclr_mask;
		status = twl_i2c_write_u8(module, cached_leden,
				TWL4030_LED_LEDEN);
		if (status < 0)
			goto done;

		status = 0;
		goto done;
	}

	/* on first use, turn GPIO module "on" */
	if (!gpio_usage_count) {
		struct twl4030_gpio_platform_data *pdata;
		u8 value = MASK_GPIO_CTRL_GPIO_ON;

		/* optionally have the first two GPIOs switch vMMC1
		 * and vMMC2 power supplies based on card presence.
		 */
		pdata = chip->dev->platform_data;
		value |= pdata->mmc_cd & 0x03;

		status = gpio_twl4030_write(REG_GPIO_CTRL, value);
	}

	if (!status)
		gpio_usage_count |= (0x1 << offset);

done:
	mutex_unlock(&gpio_lock);
	return status;
}

static void twl_free(struct gpio_chip *chip, unsigned offset)
{
	if (offset >= TWL4030_GPIO_MAX) {
		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
		return;
	}

	mutex_lock(&gpio_lock);

	gpio_usage_count &= ~BIT(offset);

	/* on last use, switch off GPIO module */
	if (!gpio_usage_count)
		gpio_twl4030_write(REG_GPIO_CTRL, 0x0);

	mutex_unlock(&gpio_lock);
}

static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
{
	return (offset < TWL4030_GPIO_MAX)
		? twl4030_set_gpio_direction(offset, 1)
		: -EINVAL;
}

static int twl_get(struct gpio_chip *chip, unsigned offset)
{
	int status = 0;

	if (offset < TWL4030_GPIO_MAX)
		status = twl4030_get_gpio_datain(offset);
	else if (offset == TWL4030_GPIO_MAX)
		status = cached_leden & LEDEN_LEDAON;
	else
		status = cached_leden & LEDEN_LEDBON;
	return (status < 0) ? 0 : status;
}

static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
{
	if (offset < TWL4030_GPIO_MAX) {
		twl4030_set_gpio_dataout(offset, value);
		return twl4030_set_gpio_direction(offset, 0);
	} else {
		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
		return 0;
	}
}

static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
{
	if (offset < TWL4030_GPIO_MAX)
		twl4030_set_gpio_dataout(offset, value);
	else
		twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
}

static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
{
	return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX))
		? (twl4030_gpio_irq_base + offset)
		: -EINVAL;
}

static struct gpio_chip twl_gpiochip = {
	.label			= "twl4030",
	.owner			= THIS_MODULE,
	.request		= twl_request,
	.free			= twl_free,
	.direction_input	= twl_direction_in,
	.get			= twl_get,
	.direction_output	= twl_direction_out,
	.set			= twl_set,
	.to_irq			= twl_to_irq,
	.can_sleep		= 1,
};

/*----------------------------------------------------------------------*/

static int __devinit gpio_twl4030_pulls(u32 ups, u32 downs)
{
	u8		message[6];
	unsigned	i, gpio_bit;

	/* For most pins, a pulldown was enabled by default.
	 * We should have data that's specific to this board.
	 */
	for (gpio_bit = 1, i = 1; i < 6; i++) {
		u8		bit_mask;
		unsigned	j;

		for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
			if (ups & gpio_bit)
				bit_mask |= 1 << (j + 1);
			else if (downs & gpio_bit)
				bit_mask |= 1 << (j + 0);
		}
		message[i] = bit_mask;
	}

	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
				REG_GPIOPUPDCTR1, 5);
}

static int __devinit gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
{
	u8		message[4];

	/* 30 msec of debouncing is always used for MMC card detect,
	 * and is optional for everything else.
	 */
	message[1] = (debounce & 0xff) | (mmc_cd & 0x03);
	debounce >>= 8;
	message[2] = (debounce & 0xff);
	debounce >>= 8;
	message[3] = (debounce & 0x03);

	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
				REG_GPIO_DEBEN1, 3);
}

static int gpio_twl4030_remove(struct platform_device *pdev);

static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
{
	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
	int ret;

	/* maybe setup IRQs */
	if (pdata->irq_base) {
		if (is_module()) {
			dev_err(&pdev->dev,
				"can't dispatch IRQs from modules\n");
			goto no_irqs;
		}
		ret = twl4030_sih_setup(TWL4030_MODULE_GPIO);
		if (ret < 0)
			return ret;
		WARN_ON(ret != pdata->irq_base);
		twl4030_gpio_irq_base = ret;
	}

no_irqs:
	/*
	 * NOTE:  boards may waste power if they don't set pullups
	 * and pulldowns correctly ... default for non-ULPI pins is
	 * pulldown, and some other pins may have external pullups
	 * or pulldowns.  Careful!
	 */
	ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
	if (ret)
		dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
				pdata->pullups, pdata->pulldowns,
				ret);

	ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
	if (ret)
		dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
				pdata->debounce, pdata->mmc_cd,
				ret);

	twl_gpiochip.base = pdata->gpio_base;
	twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
	twl_gpiochip.dev = &pdev->dev;

	/* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
	 * is (still) clear if use_leds is set.
	 */
	if (pdata->use_leds)
		twl_gpiochip.ngpio += 2;

	ret = gpiochip_add(&twl_gpiochip);
	if (ret < 0) {
		dev_err(&pdev->dev,
				"could not register gpiochip, %d\n",
				ret);
		twl_gpiochip.ngpio = 0;
		gpio_twl4030_remove(pdev);
	} else if (pdata->setup) {
		int status;

		status = pdata->setup(&pdev->dev,
				pdata->gpio_base, TWL4030_GPIO_MAX);
		if (status)
			dev_dbg(&pdev->dev, "setup --> %d\n", status);
	}

	return ret;
}

/* Cannot use __devexit as gpio_twl4030_probe() calls us */
static int gpio_twl4030_remove(struct platform_device *pdev)
{
	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
	int status;

	if (pdata->teardown) {
		status = pdata->teardown(&pdev->dev,
				pdata->gpio_base, TWL4030_GPIO_MAX);
		if (status) {
			dev_dbg(&pdev->dev, "teardown --> %d\n", status);
			return status;
		}
	}

	status = gpiochip_remove(&twl_gpiochip);
	if (status < 0)
		return status;

	if (is_module())
		return 0;

	/* REVISIT no support yet for deregistering all the IRQs */
	WARN_ON(1);
	return -EIO;
}

/* Note:  this hardware lives inside an I2C-based multi-function device. */
MODULE_ALIAS("platform:twl4030_gpio");

static struct platform_driver gpio_twl4030_driver = {
	.driver.name	= "twl4030_gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= gpio_twl4030_probe,
	.remove		= gpio_twl4030_remove,
};

static int __init gpio_twl4030_init(void)
{
	return platform_driver_register(&gpio_twl4030_driver);
}
subsys_initcall(gpio_twl4030_init);

static void __exit gpio_twl4030_exit(void)
{
	platform_driver_unregister(&gpio_twl4030_driver);
}
module_exit(gpio_twl4030_exit);

MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("GPIO interface for TWL4030");
MODULE_LICENSE("GPL");
Commit	Line	Data
e9d35947 DB	1	/*
	2	* twl4030_gpio.c -- access to GPIOs on TWL4030/TPS659x0 chips
	3	*
	4	* Copyright (C) 2006-2007 Texas Instruments, Inc.
	5	* Copyright (C) 2006 MontaVista Software, Inc.
	6	*
	7	* Code re-arranged and cleaned up by:
	8	* Syed Mohammed Khasim <x0khasim@ti.com>
	9	*
	10	* Initial Code:
	11	* Andy Lowe / Nishanth Menon
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/interrupt.h>
	31	#include <linux/kthread.h>
	32	#include <linux/irq.h>
	33	#include <linux/gpio.h>
	34	#include <linux/platform_device.h>
e9d35947	35
b07682b6	36	#include <linux/i2c/twl.h>
e9d35947 DB	37
	38
	39	/*
	40	* The GPIO "subchip" supports 18 GPIOs which can be configured as
	41	* inputs or outputs, with pullups or pulldowns on each pin. Each
	42	* GPIO can trigger interrupts on either or both edges.
	43	*
	44	* GPIO interrupts can be fed to either of two IRQ lines; this is
	45	* intended to support multiple hosts.
	46	*
	47	* There are also two LED pins used sometimes as output-only GPIOs.
	48	*/
	49
	50
	51	static struct gpio_chip twl_gpiochip;
	52	static int twl4030_gpio_irq_base;
	53
	54	/* genirq interfaces are not available to modules */
	55	#ifdef MODULE
	56	#define is_module() true
	57	#else
	58	#define is_module() false
	59	#endif
	60
	61	/* GPIO_CTRL Fields */
	62	#define MASK_GPIO_CTRL_GPIO0CD1 BIT(0)
	63	#define MASK_GPIO_CTRL_GPIO1CD2 BIT(1)
	64	#define MASK_GPIO_CTRL_GPIO_ON BIT(2)
	65
	66	/* Mask for GPIO registers when aggregated into a 32-bit integer */
	67	#define GPIO_32_MASK 0x0003ffff
	68
	69	/* Data structures */
	70	static DEFINE_MUTEX(gpio_lock);
	71
	72	/* store usage of each GPIO. - each bit represents one GPIO */
	73	static unsigned int gpio_usage_count;
	74
	75	/----------------------------------------------------------------------/
	76
	77	/*
	78	* To configure TWL4030 GPIO module registers
	79	*/
	80	static inline int gpio_twl4030_write(u8 address, u8 data)
	81	{
fc7b92fc	82	return twl_i2c_write_u8(TWL4030_MODULE_GPIO, data, address);
e9d35947 DB	83	}
	84
	85	/----------------------------------------------------------------------/
	86
	87	/*
	88	* LED register offsets (use TWL4030_MODULE_{LED,PWMA,PWMB}))
	89	* PWMs A and B are dedicated to LEDs A and B, respectively.
	90	*/
	91
	92	#define TWL4030_LED_LEDEN 0x0
	93
	94	/* LEDEN bits */
	95	#define LEDEN_LEDAON BIT(0)
	96	#define LEDEN_LEDBON BIT(1)
	97	#define LEDEN_LEDAEXT BIT(2)
	98	#define LEDEN_LEDBEXT BIT(3)
	99	#define LEDEN_LEDAPWM BIT(4)
	100	#define LEDEN_LEDBPWM BIT(5)
	101	#define LEDEN_PWM_LENGTHA BIT(6)
	102	#define LEDEN_PWM_LENGTHB BIT(7)
	103
	104	#define TWL4030_PWMx_PWMxON 0x0
	105	#define TWL4030_PWMx_PWMxOFF 0x1
	106
	107	#define PWMxON_LENGTH BIT(7)
	108
	109	/----------------------------------------------------------------------/
	110
	111	/*
	112	* To read a TWL4030 GPIO module register
	113	*/
	114	static inline int gpio_twl4030_read(u8 address)
	115	{
	116	u8 data;
	117	int ret = 0;
	118
fc7b92fc	119	ret = twl_i2c_read_u8(TWL4030_MODULE_GPIO, &data, address);
e9d35947 DB	120	return (ret < 0) ? ret : data;
	121	}
	122
	123	/----------------------------------------------------------------------/
	124
	125	static u8 cached_leden; /* protected by gpio_lock */
	126
	127	/* The LED lines are open drain outputs ... a FET pulls to GND, so an
	128	* external pullup is needed. We could also expose the integrated PWM
	129	* as a LED brightness control; we initialize it as "always on".
	130	*/
	131	static void twl4030_led_set_value(int led, int value)
	132	{
	133	u8 mask = LEDEN_LEDAON \| LEDEN_LEDAPWM;
	134	int status;
	135
	136	if (led)
	137	mask <<= 1;
	138
	139	mutex_lock(&gpio_lock);
	140	if (value)
	141	cached_leden &= ~mask;
	142	else
	143	cached_leden \|= mask;
fc7b92fc	144	status = twl_i2c_write_u8(TWL4030_MODULE_LED, cached_leden,
e9d35947 DB	145	TWL4030_LED_LEDEN);
	146	mutex_unlock(&gpio_lock);
	147	}
	148
	149	static int twl4030_set_gpio_direction(int gpio, int is_input)
	150	{
	151	u8 d_bnk = gpio >> 3;
	152	u8 d_msk = BIT(gpio & 0x7);
	153	u8 reg = 0;
	154	u8 base = REG_GPIODATADIR1 + d_bnk;
	155	int ret = 0;
	156
	157	mutex_lock(&gpio_lock);
	158	ret = gpio_twl4030_read(base);
	159	if (ret >= 0) {
	160	if (is_input)
	161	reg = ret & ~d_msk;
	162	else
	163	reg = ret \| d_msk;
	164
	165	ret = gpio_twl4030_write(base, reg);
	166	}
	167	mutex_unlock(&gpio_lock);
	168	return ret;
	169	}
	170
	171	static int twl4030_set_gpio_dataout(int gpio, int enable)
	172	{
	173	u8 d_bnk = gpio >> 3;
	174	u8 d_msk = BIT(gpio & 0x7);
	175	u8 base = 0;
	176
	177	if (enable)
	178	base = REG_SETGPIODATAOUT1 + d_bnk;
	179	else
	180	base = REG_CLEARGPIODATAOUT1 + d_bnk;
	181
	182	return gpio_twl4030_write(base, d_msk);
	183	}
	184
	185	static int twl4030_get_gpio_datain(int gpio)
	186	{
	187	u8 d_bnk = gpio >> 3;
	188	u8 d_off = gpio & 0x7;
	189	u8 base = 0;
	190	int ret = 0;
	191
	192	if (unlikely((gpio >= TWL4030_GPIO_MAX)
	193	\|\| !(gpio_usage_count & BIT(gpio))))
	194	return -EPERM;
	195
	196	base = REG_GPIODATAIN1 + d_bnk;
	197	ret = gpio_twl4030_read(base);
	198	if (ret > 0)
	199	ret = (ret >> d_off) & 0x1;
	200
	201	return ret;
	202	}
	203
e9d35947 DB	204	/----------------------------------------------------------------------/
	205
	206	static int twl_request(struct gpio_chip *chip, unsigned offset)
	207	{
	208	int status = 0;
	209
	210	mutex_lock(&gpio_lock);
	211
	212	/* Support the two LED outputs as output-only GPIOs. */
	213	if (offset >= TWL4030_GPIO_MAX) {
	214	u8 ledclr_mask = LEDEN_LEDAON \| LEDEN_LEDAEXT
	215	\| LEDEN_LEDAPWM \| LEDEN_PWM_LENGTHA;
	216	u8 module = TWL4030_MODULE_PWMA;
	217
	218	offset -= TWL4030_GPIO_MAX;
	219	if (offset) {
	220	ledclr_mask <<= 1;
	221	module = TWL4030_MODULE_PWMB;
	222	}
	223
	224	/* initialize PWM to always-drive */
fc7b92fc	225	status = twl_i2c_write_u8(module, 0x7f,
e9d35947 DB	226	TWL4030_PWMx_PWMxOFF);
	227	if (status < 0)
	228	goto done;
fc7b92fc	229	status = twl_i2c_write_u8(module, 0x7f,
e9d35947 DB	230	TWL4030_PWMx_PWMxON);
	231	if (status < 0)
	232	goto done;
	233
	234	/* init LED to not-driven (high) */
	235	module = TWL4030_MODULE_LED;
fc7b92fc	236	status = twl_i2c_read_u8(module, &cached_leden,
e9d35947 DB	237	TWL4030_LED_LEDEN);
	238	if (status < 0)
	239	goto done;
	240	cached_leden &= ~ledclr_mask;
fc7b92fc	241	status = twl_i2c_write_u8(module, cached_leden,
e9d35947 DB	242	TWL4030_LED_LEDEN);
	243	if (status < 0)
	244	goto done;
	245
	246	status = 0;
	247	goto done;
	248	}
	249
	250	/* on first use, turn GPIO module "on" */
	251	if (!gpio_usage_count) {
	252	struct twl4030_gpio_platform_data *pdata;
	253	u8 value = MASK_GPIO_CTRL_GPIO_ON;
	254
	255	/* optionally have the first two GPIOs switch vMMC1
	256	* and vMMC2 power supplies based on card presence.
	257	*/
	258	pdata = chip->dev->platform_data;
	259	value \|= pdata->mmc_cd & 0x03;
	260
	261	status = gpio_twl4030_write(REG_GPIO_CTRL, value);
	262	}
	263
	264	if (!status)
	265	gpio_usage_count \|= (0x1 << offset);
	266
	267	done:
	268	mutex_unlock(&gpio_lock);
	269	return status;
	270	}
	271
	272	static void twl_free(struct gpio_chip *chip, unsigned offset)
	273	{
	274	if (offset >= TWL4030_GPIO_MAX) {
	275	twl4030_led_set_value(offset - TWL4030_GPIO_MAX, 1);
	276	return;
	277	}
	278
	279	mutex_lock(&gpio_lock);
	280
	281	gpio_usage_count &= ~BIT(offset);
	282
	283	/* on last use, switch off GPIO module */
	284	if (!gpio_usage_count)
	285	gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
	286
	287	mutex_unlock(&gpio_lock);
	288	}
	289
	290	static int twl_direction_in(struct gpio_chip *chip, unsigned offset)
	291	{
	292	return (offset < TWL4030_GPIO_MAX)
	293	? twl4030_set_gpio_direction(offset, 1)
	294	: -EINVAL;
	295	}
	296
	297	static int twl_get(struct gpio_chip *chip, unsigned offset)
	298	{
	299	int status = 0;
	300
	301	if (offset < TWL4030_GPIO_MAX)
	302	status = twl4030_get_gpio_datain(offset);
	303	else if (offset == TWL4030_GPIO_MAX)
	304	status = cached_leden & LEDEN_LEDAON;
	305	else
306	status = cached_leden & LEDEN_LEDBON;
307	return (status < 0) ? 0 : status;
308	}
309
310	static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
311	{
312	if (offset < TWL4030_GPIO_MAX) {
313	twl4030_set_gpio_dataout(offset, value);
314	return twl4030_set_gpio_direction(offset, 0);
315	} else {
316	twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
317	return 0;
318	}
319	}
320
321	static void twl_set(struct gpio_chip *chip, unsigned offset, int value)
322	{
323	if (offset < TWL4030_GPIO_MAX)
324	twl4030_set_gpio_dataout(offset, value);
325	else
326	twl4030_led_set_value(offset - TWL4030_GPIO_MAX, value);
327	}
328
329	static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
330	{
331	return (twl4030_gpio_irq_base && (offset < TWL4030_GPIO_MAX))
332	? (twl4030_gpio_irq_base + offset)
333	: -EINVAL;
334	}
335
336	static struct gpio_chip twl_gpiochip = {
337	.label = "twl4030",
338	.owner = THIS_MODULE,
339	.request = twl_request,
340	.free = twl_free,
341	.direction_input = twl_direction_in,
342	.get = twl_get,
343	.direction_output = twl_direction_out,
344	.set = twl_set,
345	.to_irq = twl_to_irq,
346	.can_sleep = 1,
347	};
348
349	/----------------------------------------------------------------------/
350
351	static int __devinit gpio_twl4030_pulls(u32 ups, u32 downs)
352	{
353	u8 message[6];
354	unsigned i, gpio_bit;
355
356	/* For most pins, a pulldown was enabled by default.
357	* We should have data that's specific to this board.
358	*/
359	for (gpio_bit = 1, i = 1; i < 6; i++) {
360	u8 bit_mask;
361	unsigned j;
362
363	for (bit_mask = 0, j = 0; j < 8; j += 2, gpio_bit <<= 1) {
364	if (ups & gpio_bit)
365	bit_mask \|= 1 << (j + 1);
366	else if (downs & gpio_bit)
367	bit_mask \|= 1 << (j + 0);
368	}
369	message[i] = bit_mask;
370	}
371
fc7b92fc	372	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
e9d35947 DB	373	REG_GPIOPUPDCTR1, 5);
	374	}
	375
cabb3fc4 DB	376	static int __devinit gpio_twl4030_debounce(u32 debounce, u8 mmc_cd)
	377	{
	378	u8 message[4];
	379
	380	/* 30 msec of debouncing is always used for MMC card detect,
	381	* and is optional for everything else.
	382	*/
	383	message[1] = (debounce & 0xff) \| (mmc_cd & 0x03);
	384	debounce >>= 8;
	385	message[2] = (debounce & 0xff);
	386	debounce >>= 8;
	387	message[3] = (debounce & 0x03);
	388
fc7b92fc	389	return twl_i2c_write(TWL4030_MODULE_GPIO, message,
cabb3fc4 DB	390	REG_GPIO_DEBEN1, 3);
	391	}
	392
e9d35947 DB	393	static int gpio_twl4030_remove(struct platform_device *pdev);
	394
	395	static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
	396	{
	397	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
	398	int ret;
	399
	400	/* maybe setup IRQs */
	401	if (pdata->irq_base) {
	402	if (is_module()) {
	403	dev_err(&pdev->dev,
	404	"can't dispatch IRQs from modules\n");
	405	goto no_irqs;
	406	}
	407	ret = twl4030_sih_setup(TWL4030_MODULE_GPIO);
	408	if (ret < 0)
	409	return ret;
	410	WARN_ON(ret != pdata->irq_base);
	411	twl4030_gpio_irq_base = ret;
	412	}
	413
	414	no_irqs:
	415	/*
	416	* NOTE: boards may waste power if they don't set pullups
	417	* and pulldowns correctly ... default for non-ULPI pins is
	418	* pulldown, and some other pins may have external pullups
	419	* or pulldowns. Careful!
	420	*/
	421	ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
	422	if (ret)
	423	dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
	424	pdata->pullups, pdata->pulldowns,
	425	ret);
	426
cabb3fc4 DB	427	ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
	428	if (ret)
	429	dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
	430	pdata->debounce, pdata->mmc_cd,
	431	ret);
	432
e9d35947 DB	433	twl_gpiochip.base = pdata->gpio_base;
	434	twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
	435	twl_gpiochip.dev = &pdev->dev;
	436
	437	/* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
	438	* is (still) clear if use_leds is set.
	439	*/
	440	if (pdata->use_leds)
	441	twl_gpiochip.ngpio += 2;
	442
	443	ret = gpiochip_add(&twl_gpiochip);
	444	if (ret < 0) {
	445	dev_err(&pdev->dev,
	446	"could not register gpiochip, %d\n",
	447	ret);
	448	twl_gpiochip.ngpio = 0;
	449	gpio_twl4030_remove(pdev);
	450	} else if (pdata->setup) {
	451	int status;
	452
	453	status = pdata->setup(&pdev->dev,
	454	pdata->gpio_base, TWL4030_GPIO_MAX);
	455	if (status)
	456	dev_dbg(&pdev->dev, "setup --> %d\n", status);
	457	}
	458
	459	return ret;
	460	}
	461
46c529cf MF	462	/* Cannot use __devexit as gpio_twl4030_probe() calls us */
46c529cf MF	463	static int gpio_twl4030_remove(struct platform_device *pdev)
e9d35947 DB	464	{
	465	struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
	466	int status;
	467
	468	if (pdata->teardown) {
	469	status = pdata->teardown(&pdev->dev,
	470	pdata->gpio_base, TWL4030_GPIO_MAX);
	471	if (status) {
	472	dev_dbg(&pdev->dev, "teardown --> %d\n", status);
	473	return status;
	474	}
	475	}
	476
	477	status = gpiochip_remove(&twl_gpiochip);
	478	if (status < 0)
	479	return status;
	480
	481	if (is_module())
	482	return 0;
	483
	484	/* REVISIT no support yet for deregistering all the IRQs */
	485	WARN_ON(1);
	486	return -EIO;
	487	}
	488
	489	/* Note: this hardware lives inside an I2C-based multi-function device. */
	490	MODULE_ALIAS("platform:twl4030_gpio");
	491
	492	static struct platform_driver gpio_twl4030_driver = {
	493	.driver.name = "twl4030_gpio",
	494	.driver.owner = THIS_MODULE,
	495	.probe = gpio_twl4030_probe,
46c529cf	496	.remove = gpio_twl4030_remove,
e9d35947 DB	497	};
	498
	499	static int __init gpio_twl4030_init(void)
	500	{
	501	return platform_driver_register(&gpio_twl4030_driver);
	502	}
	503	subsys_initcall(gpio_twl4030_init);
	504
	505	static void __exit gpio_twl4030_exit(void)
	506	{
	507	platform_driver_unregister(&gpio_twl4030_driver);
	508	}
	509	module_exit(gpio_twl4030_exit);
	510
	511	MODULE_AUTHOR("Texas Instruments, Inc.");
	512	MODULE_DESCRIPTION("GPIO interface for TWL4030");
	513	MODULE_LICENSE("GPL");