[linux-2.6-block.git] / drivers / mfd / twl6040-core.c

/*
 * MFD driver for TWL6040 audio device
 *
 * Authors:	Misael Lopez Cruz <misael.lopez@ti.com>
 *		Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
 *		Peter Ujfalusi <peter.ujfalusi@ti.com>
 *
 * Copyright:	(C) 2011 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/i2c/twl.h>
#include <linux/mfd/core.h>
#include <linux/mfd/twl6040.h>

static struct platform_device *twl6040_dev;

int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
{
	int ret;
	u8 val = 0;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	if (ret < 0) {
		mutex_unlock(&twl6040->io_mutex);
		return ret;
	}
	mutex_unlock(&twl6040->io_mutex);

	return val;
}
EXPORT_SYMBOL(twl6040_reg_read);

int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
{
	int ret;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
	mutex_unlock(&twl6040->io_mutex);

	return ret;
}
EXPORT_SYMBOL(twl6040_reg_write);

int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
{
	int ret;
	u8 val;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	if (ret)
		goto out;

	val |= mask;
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
out:
	mutex_unlock(&twl6040->io_mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_set_bits);

int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
{
	int ret;
	u8 val;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	if (ret)
		goto out;

	val &= ~mask;
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
out:
	mutex_unlock(&twl6040->io_mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_clear_bits);

/* twl6040 codec manual power-up sequence */
static int twl6040_power_up(struct twl6040 *twl6040)
{
	u8 ldoctl, ncpctl, lppllctl;
	int ret;

	/* enable high-side LDO, reference system and internal oscillator */
	ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		return ret;
	usleep_range(10000, 10500);

	/* enable negative charge pump */
	ncpctl = TWL6040_NCPENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
	if (ret)
		goto ncp_err;
	usleep_range(1000, 1500);

	/* enable low-side LDO */
	ldoctl |= TWL6040_LSLDOENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		goto lsldo_err;
	usleep_range(1000, 1500);

	/* enable low-power PLL */
	lppllctl = TWL6040_LPLLENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
	if (ret)
		goto lppll_err;
	usleep_range(5000, 5500);

	/* disable internal oscillator */
	ldoctl &= ~TWL6040_OSCENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		goto osc_err;

	return 0;

osc_err:
	lppllctl &= ~TWL6040_LPLLENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
lppll_err:
	ldoctl &= ~TWL6040_LSLDOENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
lsldo_err:
	ncpctl &= ~TWL6040_NCPENA;
	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
ncp_err:
	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);

	return ret;
}

/* twl6040 manual power-down sequence */
static void twl6040_power_down(struct twl6040 *twl6040)
{
	u8 ncpctl, ldoctl, lppllctl;

	ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
	ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);

	/* enable internal oscillator */
	ldoctl |= TWL6040_OSCENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	usleep_range(1000, 1500);

	/* disable low-power PLL */
	lppllctl &= ~TWL6040_LPLLENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

	/* disable low-side LDO */
	ldoctl &= ~TWL6040_LSLDOENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);

	/* disable negative charge pump */
	ncpctl &= ~TWL6040_NCPENA;
	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);

	/* disable high-side LDO, reference system and internal oscillator */
	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
}

static irqreturn_t twl6040_naudint_handler(int irq, void *data)
{
	struct twl6040 *twl6040 = data;
	u8 intid, status;

	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);

	if (intid & TWL6040_READYINT)
		complete(&twl6040->ready);

	if (intid & TWL6040_THINT) {
		status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
		if (status & TWL6040_TSHUTDET) {
			dev_warn(&twl6040_dev->dev,
				 "Thermal shutdown, powering-off");
			twl6040_power(twl6040, 0);
		} else {
			dev_warn(&twl6040_dev->dev,
				 "Leaving thermal shutdown, powering-on");
			twl6040_power(twl6040, 1);
		}
	}

	return IRQ_HANDLED;
}

static int twl6040_power_up_completion(struct twl6040 *twl6040,
				       int naudint)
{
	int time_left;
	u8 intid;

	time_left = wait_for_completion_timeout(&twl6040->ready,
						msecs_to_jiffies(144));
	if (!time_left) {
		intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
		if (!(intid & TWL6040_READYINT)) {
			dev_err(&twl6040_dev->dev,
				"timeout waiting for READYINT\n");
			return -ETIMEDOUT;
		}
	}

	return 0;
}

int twl6040_power(struct twl6040 *twl6040, int on)
{
	int audpwron = twl6040->audpwron;
	int naudint = twl6040->irq;
	int ret = 0;

	mutex_lock(&twl6040->mutex);

	if (on) {
		/* already powered-up */
		if (twl6040->power_count++)
			goto out;

		if (gpio_is_valid(audpwron)) {
			/* use AUDPWRON line */
			gpio_set_value(audpwron, 1);
			/* wait for power-up completion */
			ret = twl6040_power_up_completion(twl6040, naudint);
			if (ret) {
				dev_err(&twl6040_dev->dev,
					"automatic power-down failed\n");
				twl6040->power_count = 0;
				goto out;
			}
		} else {
			/* use manual power-up sequence */
			ret = twl6040_power_up(twl6040);
			if (ret) {
				dev_err(&twl6040_dev->dev,
					"manual power-up failed\n");
				twl6040->power_count = 0;
				goto out;
			}
		}
		twl6040->pll = TWL6040_LPPLL_ID;
		twl6040->sysclk = 19200000;
	} else {
		/* already powered-down */
		if (!twl6040->power_count) {
			dev_err(&twl6040_dev->dev,
				"device is already powered-off\n");
			ret = -EPERM;
			goto out;
		}

		if (--twl6040->power_count)
			goto out;

		if (gpio_is_valid(audpwron)) {
			/* use AUDPWRON line */
			gpio_set_value(audpwron, 0);

			/* power-down sequence latency */
			usleep_range(500, 700);
		} else {
			/* use manual power-down sequence */
			twl6040_power_down(twl6040);
		}
		twl6040->pll = TWL6040_NOPLL_ID;
		twl6040->sysclk = 0;
	}

out:
	mutex_unlock(&twl6040->mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_power);

int twl6040_set_pll(struct twl6040 *twl6040, enum twl6040_pll_id id,
		    unsigned int freq_in, unsigned int freq_out)
{
	u8 hppllctl, lppllctl;
	int ret = 0;

	mutex_lock(&twl6040->mutex);

	hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);

	switch (id) {
	case TWL6040_LPPLL_ID:
		/* low-power PLL divider */
		switch (freq_out) {
		case 17640000:
			lppllctl |= TWL6040_LPLLFIN;
			break;
		case 19200000:
			lppllctl &= ~TWL6040_LPLLFIN;
			break;
		default:
			dev_err(&twl6040_dev->dev,
				"freq_out %d not supported\n", freq_out);
			ret = -EINVAL;
			goto pll_out;
		}
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

		switch (freq_in) {
		case 32768:
			lppllctl |= TWL6040_LPLLENA;
			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
					  lppllctl);
			mdelay(5);
			lppllctl &= ~TWL6040_HPLLSEL;
			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
					  lppllctl);
			hppllctl &= ~TWL6040_HPLLENA;
			twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
					  hppllctl);
			break;
		default:
			dev_err(&twl6040_dev->dev,
				"freq_in %d not supported\n", freq_in);
			ret = -EINVAL;
			goto pll_out;
		}

		twl6040->pll = TWL6040_LPPLL_ID;
		break;
	case TWL6040_HPPLL_ID:
		/* high-performance PLL can provide only 19.2 MHz */
		if (freq_out != 19200000) {
			dev_err(&twl6040_dev->dev,
				"freq_out %d not supported\n", freq_out);
			ret = -EINVAL;
			goto pll_out;
		}

		hppllctl &= ~TWL6040_MCLK_MSK;

		switch (freq_in) {
		case 12000000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_12000KHZ |
				    TWL6040_HPLLENA;
			break;
		case 19200000:
			/*
			 * PLL disabled
			 * (enable PLL if MCLK jitter quality
			 *  doesn't meet specification)
			 */
			hppllctl |= TWL6040_MCLK_19200KHZ;
			break;
		case 26000000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_26000KHZ |
				    TWL6040_HPLLENA;
			break;
		case 38400000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_38400KHZ |
				    TWL6040_HPLLENA;
			break;
		default:
			dev_err(&twl6040_dev->dev,
				"freq_in %d not supported\n", freq_in);
			ret = -EINVAL;
			goto pll_out;
		}

		/* enable clock slicer to ensure input waveform is square */
		hppllctl |= TWL6040_HPLLSQRENA;

		twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
		usleep_range(500, 700);
		lppllctl |= TWL6040_HPLLSEL;
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
		lppllctl &= ~TWL6040_LPLLENA;
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

		twl6040->pll = TWL6040_HPPLL_ID;
		break;
	default:
		dev_err(&twl6040_dev->dev, "unknown pll id %d\n", id);
		ret = -EINVAL;
		goto pll_out;
	}

	twl6040->sysclk = freq_out;

pll_out:
	mutex_unlock(&twl6040->mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_set_pll);

enum twl6040_pll_id twl6040_get_pll(struct twl6040 *twl6040)
{
	return twl6040->pll;
}
EXPORT_SYMBOL(twl6040_get_pll);

unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
{
	return twl6040->sysclk;
}
EXPORT_SYMBOL(twl6040_get_sysclk);

static int __devinit twl6040_probe(struct platform_device *pdev)
{
	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
	struct twl6040 *twl6040;
	struct mfd_cell *cell = NULL;
	int ret, children = 0;

	if (!pdata) {
		dev_err(&pdev->dev, "Platform data is missing\n");
		return -EINVAL;
	}

	twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
	if (!twl6040)
		return -ENOMEM;

	platform_set_drvdata(pdev, twl6040);

	twl6040_dev = pdev;
	twl6040->dev = &pdev->dev;
	twl6040->audpwron = pdata->audpwron_gpio;
	twl6040->irq = pdata->naudint_irq;
	twl6040->irq_base = pdata->irq_base;

	mutex_init(&twl6040->mutex);
	mutex_init(&twl6040->io_mutex);
	init_completion(&twl6040->ready);

	twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);

	if (gpio_is_valid(twl6040->audpwron)) {
		ret = gpio_request(twl6040->audpwron, "audpwron");
		if (ret)
			goto gpio1_err;

		ret = gpio_direction_output(twl6040->audpwron, 0);
		if (ret)
			goto gpio2_err;
	}

	/* ERRATA: Automatic power-up is not possible in ES1.0 */
	if (twl6040->rev == TWL6040_REV_ES1_0)
		twl6040->audpwron = -EINVAL;

	if (twl6040->irq) {
		/* codec interrupt */
		ret = twl6040_irq_init(twl6040);
		if (ret)
			goto gpio2_err;

		ret = twl6040_request_irq(twl6040, TWL6040_IRQ_READY,
					  twl6040_naudint_handler, 0,
					  "twl6040_irq_ready", twl6040);
		if (ret) {
			dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
				ret);
			goto irq_err;
		}
	}

	/* dual-access registers controlled by I2C only */
	twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);

	if (pdata->codec) {
		cell = &twl6040->cells[children];
		cell->name = "twl6040-codec";
		/* The codec expects the twl4030_audio_data as platform data */
		cell->platform_data = pdata;
		cell->pdata_size = sizeof(*pdata);
		children++;
	}

	if (pdata->vibra) {
		cell = &twl6040->cells[children];
		cell->name = "twl6040-vibra";
		cell->platform_data = pdata->vibra;
		cell->pdata_size = sizeof(*pdata->vibra);
		children++;
	}

	if (children) {
		ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
				      children, NULL, 0);
		if (ret)
			goto mfd_err;
	} else {
		dev_err(&pdev->dev, "No platform data found for children\n");
		ret = -ENODEV;
		goto mfd_err;
	}

	return 0;

mfd_err:
	if (twl6040->irq)
		twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
irq_err:
	if (twl6040->irq)
		twl6040_irq_exit(twl6040);
gpio2_err:
	if (gpio_is_valid(twl6040->audpwron))
		gpio_free(twl6040->audpwron);
gpio1_err:
	platform_set_drvdata(pdev, NULL);
	kfree(twl6040);
	twl6040_dev = NULL;
	return ret;
}

static int __devexit twl6040_remove(struct platform_device *pdev)
{
	struct twl6040 *twl6040 = platform_get_drvdata(pdev);

	if (twl6040->power_count)
		twl6040_power(twl6040, 0);

	if (gpio_is_valid(twl6040->audpwron))
		gpio_free(twl6040->audpwron);

	twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);

	if (twl6040->irq)
		twl6040_irq_exit(twl6040);

	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	kfree(twl6040);
	twl6040_dev = NULL;

	return 0;
}

static struct platform_driver twl6040_driver = {
	.probe		= twl6040_probe,
	.remove		= __devexit_p(twl6040_remove),
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "twl6040",
	},
};

static int __devinit twl6040_init(void)
{
	return platform_driver_register(&twl6040_driver);
}
module_init(twl6040_init);

static void __devexit twl6040_exit(void)
{
	platform_driver_unregister(&twl6040_driver);
}

module_exit(twl6040_exit);

MODULE_DESCRIPTION("TWL6040 MFD");
MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:twl6040");
Commit	Line	Data
f19b2823 MLC	1	/*
	2	* MFD driver for TWL6040 audio device
	3	*
	4	* Authors: Misael Lopez Cruz <misael.lopez@ti.com>
	5	* Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
	6	* Peter Ujfalusi <peter.ujfalusi@ti.com>
	7	*
	8	* Copyright: (C) 2011 Texas Instruments, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	22	* 02110-1301 USA
	23	*
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/types.h>
	28	#include <linux/slab.h>
	29	#include <linux/kernel.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/gpio.h>
	32	#include <linux/delay.h>
	33	#include <linux/i2c/twl.h>
	34	#include <linux/mfd/core.h>
	35	#include <linux/mfd/twl6040.h>
	36
	37	static struct platform_device *twl6040_dev;
	38
	39	int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
	40	{
	41	int ret;
	42	u8 val = 0;
	43
	44	mutex_lock(&twl6040->io_mutex);
	45	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	46	if (ret < 0) {
	47	mutex_unlock(&twl6040->io_mutex);
	48	return ret;
	49	}
	50	mutex_unlock(&twl6040->io_mutex);
	51
	52	return val;
	53	}
	54	EXPORT_SYMBOL(twl6040_reg_read);
	55
	56	int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
	57	{
	58	int ret;
	59
	60	mutex_lock(&twl6040->io_mutex);
	61	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
	62	mutex_unlock(&twl6040->io_mutex);
	63
	64	return ret;
65	}
66	EXPORT_SYMBOL(twl6040_reg_write);
67
68	int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
69	{
70	int ret;
71	u8 val;
72
73	mutex_lock(&twl6040->io_mutex);
74	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
75	if (ret)
76	goto out;
77
78	val \|= mask;
79	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
80	out:
81	mutex_unlock(&twl6040->io_mutex);
82	return ret;
83	}
84	EXPORT_SYMBOL(twl6040_set_bits);
85
86	int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
87	{
88	int ret;
89	u8 val;
90
91	mutex_lock(&twl6040->io_mutex);
92	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
93	if (ret)
94	goto out;
95
96	val &= ~mask;
97	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
98	out:
99	mutex_unlock(&twl6040->io_mutex);
100	return ret;
101	}
102	EXPORT_SYMBOL(twl6040_clear_bits);
103
104	/* twl6040 codec manual power-up sequence */
105	static int twl6040_power_up(struct twl6040 *twl6040)
106	{
107	u8 ldoctl, ncpctl, lppllctl;
108	int ret;
109
110	/* enable high-side LDO, reference system and internal oscillator */
111	ldoctl = TWL6040_HSLDOENA \| TWL6040_REFENA \| TWL6040_OSCENA;
112	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
113	if (ret)
114	return ret;
115	usleep_range(10000, 10500);
116
117	/* enable negative charge pump */
118	ncpctl = TWL6040_NCPENA;
119	ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
120	if (ret)
121	goto ncp_err;
122	usleep_range(1000, 1500);
123
124	/* enable low-side LDO */
125	ldoctl \|= TWL6040_LSLDOENA;
126	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
127	if (ret)
128	goto lsldo_err;
129	usleep_range(1000, 1500);
130
131	/* enable low-power PLL */
132	lppllctl = TWL6040_LPLLENA;
133	ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
134	if (ret)
135	goto lppll_err;
136	usleep_range(5000, 5500);
137
138	/* disable internal oscillator */
139	ldoctl &= ~TWL6040_OSCENA;
140	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
141	if (ret)
142	goto osc_err;
143
144	return 0;
145
146	osc_err:
147	lppllctl &= ~TWL6040_LPLLENA;
148	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
149	lppll_err:
150	ldoctl &= ~TWL6040_LSLDOENA;
151	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
152	lsldo_err:
153	ncpctl &= ~TWL6040_NCPENA;
154	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
155	ncp_err:
156	ldoctl &= ~(TWL6040_HSLDOENA \| TWL6040_REFENA \| TWL6040_OSCENA);
157	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
158
159	return ret;
160	}
161
162	/* twl6040 manual power-down sequence */
163	static void twl6040_power_down(struct twl6040 *twl6040)
164	{
165	u8 ncpctl, ldoctl, lppllctl;
166
167	ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
168	ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
169	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
170
171	/* enable internal oscillator */
172	ldoctl \|= TWL6040_OSCENA;
173	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
174	usleep_range(1000, 1500);
175
176	/* disable low-power PLL */
177	lppllctl &= ~TWL6040_LPLLENA;
178	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
179
180	/* disable low-side LDO */
181	ldoctl &= ~TWL6040_LSLDOENA;
182	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
183
184	/* disable negative charge pump */
185	ncpctl &= ~TWL6040_NCPENA;
186	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
187
188	/* disable high-side LDO, reference system and internal oscillator */
189	ldoctl &= ~(TWL6040_HSLDOENA \| TWL6040_REFENA \| TWL6040_OSCENA);
190	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
191	}
192
193	static irqreturn_t twl6040_naudint_handler(int irq, void *data)
194	{
195	struct twl6040 *twl6040 = data;
196	u8 intid, status;
197
198	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
199
200	if (intid & TWL6040_READYINT)
201	complete(&twl6040->ready);
202
203	if (intid & TWL6040_THINT) {
204	status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
205	if (status & TWL6040_TSHUTDET) {
206	dev_warn(&twl6040_dev->dev,
207	"Thermal shutdown, powering-off");
208	twl6040_power(twl6040, 0);
209	} else {
210	dev_warn(&twl6040_dev->dev,
211	"Leaving thermal shutdown, powering-on");
212	twl6040_power(twl6040, 1);
213	}
214	}
215
216	return IRQ_HANDLED;
217	}
218
219	static int twl6040_power_up_completion(struct twl6040 *twl6040,
220	int naudint)
221	{
222	int time_left;
223	u8 intid;
224
225	time_left = wait_for_completion_timeout(&twl6040->ready,
226	msecs_to_jiffies(144));
227	if (!time_left) {
228	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
229	if (!(intid & TWL6040_READYINT)) {
230	dev_err(&twl6040_dev->dev,
231	"timeout waiting for READYINT\n");
232	return -ETIMEDOUT;
233	}
234	}
235
236	return 0;
237	}
238
239	int twl6040_power(struct twl6040 *twl6040, int on)
240	{
241	int audpwron = twl6040->audpwron;
242	int naudint = twl6040->irq;
243	int ret = 0;
244
245	mutex_lock(&twl6040->mutex);
246
247	if (on) {
248	/* already powered-up */
249	if (twl6040->power_count++)
250	goto out;
251
252	if (gpio_is_valid(audpwron)) {
253	/* use AUDPWRON line */
254	gpio_set_value(audpwron, 1);
255	/* wait for power-up completion */
256	ret = twl6040_power_up_completion(twl6040, naudint);
257	if (ret) {
258	dev_err(&twl6040_dev->dev,
259	"automatic power-down failed\n");
260	twl6040->power_count = 0;
261	goto out;
262	}
263	} else {
264	/* use manual power-up sequence */
265	ret = twl6040_power_up(twl6040);
266	if (ret) {
267	dev_err(&twl6040_dev->dev,
268	"manual power-up failed\n");
269	twl6040->power_count = 0;
270	goto out;
271	}
272	}
273	twl6040->pll = TWL6040_LPPLL_ID;
274	twl6040->sysclk = 19200000;
275	} else {
276	/* already powered-down */
277	if (!twl6040->power_count) {
278	dev_err(&twl6040_dev->dev,
279	"device is already powered-off\n");
280	ret = -EPERM;
281	goto out;
282	}
283
284	if (--twl6040->power_count)
285	goto out;
286
287	if (gpio_is_valid(audpwron)) {
288	/* use AUDPWRON line */
289	gpio_set_value(audpwron, 0);
290
291	/* power-down sequence latency */
292	usleep_range(500, 700);
293	} else {
294	/* use manual power-down sequence */
295	twl6040_power_down(twl6040);
296	}
297	twl6040->pll = TWL6040_NOPLL_ID;
298	twl6040->sysclk = 0;
299	}
300
301	out:
302	mutex_unlock(&twl6040->mutex);
303	return ret;
304	}
305	EXPORT_SYMBOL(twl6040_power);
306
307	int twl6040_set_pll(struct twl6040 *twl6040, enum twl6040_pll_id id,
308	unsigned int freq_in, unsigned int freq_out)
309	{
310	u8 hppllctl, lppllctl;
311	int ret = 0;
312
313	mutex_lock(&twl6040->mutex);
314
315	hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
316	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
317
318	switch (id) {
319	case TWL6040_LPPLL_ID:
320	/* low-power PLL divider */
321	switch (freq_out) {
322	case 17640000:
323	lppllctl \|= TWL6040_LPLLFIN;
324	break;
325	case 19200000:
326	lppllctl &= ~TWL6040_LPLLFIN;
327	break;
328	default:
329	dev_err(&twl6040_dev->dev,
330	"freq_out %d not supported\n", freq_out);
331	ret = -EINVAL;
332	goto pll_out;
333	}
334	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
335
336	switch (freq_in) {
337	case 32768:
338	lppllctl \|= TWL6040_LPLLENA;
339	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
340	lppllctl);
341	mdelay(5);
342	lppllctl &= ~TWL6040_HPLLSEL;
343	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
344	lppllctl);
345	hppllctl &= ~TWL6040_HPLLENA;
346	twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
347	hppllctl);
348	break;
349	default:
350	dev_err(&twl6040_dev->dev,
351	"freq_in %d not supported\n", freq_in);
352	ret = -EINVAL;
353	goto pll_out;
354	}
355
356	twl6040->pll = TWL6040_LPPLL_ID;
357	break;
358	case TWL6040_HPPLL_ID:
359	/* high-performance PLL can provide only 19.2 MHz */
360	if (freq_out != 19200000) {
361	dev_err(&twl6040_dev->dev,
362	"freq_out %d not supported\n", freq_out);
363	ret = -EINVAL;
364	goto pll_out;
365	}
366
367	hppllctl &= ~TWL6040_MCLK_MSK;
368
369	switch (freq_in) {
370	case 12000000:
371	/* PLL enabled, active mode */
372	hppllctl \|= TWL6040_MCLK_12000KHZ \|
373	TWL6040_HPLLENA;
374	break;
375	case 19200000:
376	/*
377	* PLL disabled
378	* (enable PLL if MCLK jitter quality
379	* doesn't meet specification)
380	*/
381	hppllctl \|= TWL6040_MCLK_19200KHZ;
382	break;
383	case 26000000:
384	/* PLL enabled, active mode */
385	hppllctl \|= TWL6040_MCLK_26000KHZ \|
386	TWL6040_HPLLENA;
387	break;
388	case 38400000:
389	/* PLL enabled, active mode */
390	hppllctl \|= TWL6040_MCLK_38400KHZ \|
391	TWL6040_HPLLENA;
392	break;
393	default:
394	dev_err(&twl6040_dev->dev,
395	"freq_in %d not supported\n", freq_in);
396	ret = -EINVAL;
397	goto pll_out;
398	}
399
400	/* enable clock slicer to ensure input waveform is square */
401	hppllctl \|= TWL6040_HPLLSQRENA;
402
403	twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
404	usleep_range(500, 700);
405	lppllctl \|= TWL6040_HPLLSEL;
406	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
407	lppllctl &= ~TWL6040_LPLLENA;
408	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
409
410	twl6040->pll = TWL6040_HPPLL_ID;
411	break;
412	default:
413	dev_err(&twl6040_dev->dev, "unknown pll id %d\n", id);
414	ret = -EINVAL;
415	goto pll_out;
416	}
417
418	twl6040->sysclk = freq_out;
419
420	pll_out:
421	mutex_unlock(&twl6040->mutex);
422	return ret;
423	}
424	EXPORT_SYMBOL(twl6040_set_pll);
425
426	enum twl6040_pll_id twl6040_get_pll(struct twl6040 *twl6040)
427	{
428	return twl6040->pll;
429	}
430	EXPORT_SYMBOL(twl6040_get_pll);
431
432	unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
433	{
434	return twl6040->sysclk;
435	}
436	EXPORT_SYMBOL(twl6040_get_sysclk);
437
438	static int __devinit twl6040_probe(struct platform_device *pdev)
439	{
440	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
441	struct twl6040 *twl6040;
442	struct mfd_cell *cell = NULL;
443	int ret, children = 0;
444
445	if (!pdata) {
446	dev_err(&pdev->dev, "Platform data is missing\n");
447	return -EINVAL;
448	}
449
450	twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
451	if (!twl6040)
452	return -ENOMEM;
453
454	platform_set_drvdata(pdev, twl6040);
455
456	twl6040_dev = pdev;
457	twl6040->dev = &pdev->dev;
458	twl6040->audpwron = pdata->audpwron_gpio;
459	twl6040->irq = pdata->naudint_irq;
460	twl6040->irq_base = pdata->irq_base;
461
462	mutex_init(&twl6040->mutex);
463	mutex_init(&twl6040->io_mutex);
464	init_completion(&twl6040->ready);
465
466	twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
467
468	if (gpio_is_valid(twl6040->audpwron)) {
469	ret = gpio_request(twl6040->audpwron, "audpwron");
470	if (ret)
471	goto gpio1_err;
472
473	ret = gpio_direction_output(twl6040->audpwron, 0);
474	if (ret)
475	goto gpio2_err;
476	}
477
478	/* ERRATA: Automatic power-up is not possible in ES1.0 */
479	if (twl6040->rev == TWL6040_REV_ES1_0)
480	twl6040->audpwron = -EINVAL;
481
482	if (twl6040->irq) {
483	/* codec interrupt */
484	ret = twl6040_irq_init(twl6040);
485	if (ret)
486	goto gpio2_err;
487
488	ret = twl6040_request_irq(twl6040, TWL6040_IRQ_READY,
489	twl6040_naudint_handler, 0,
490	"twl6040_irq_ready", twl6040);
491	if (ret) {
492	dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
493	ret);
494	goto irq_err;
495	}
496	}
497
498	/* dual-access registers controlled by I2C only */
499	twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
500
501	if (pdata->codec) {
502	cell = &twl6040->cells[children];
503	cell->name = "twl6040-codec";
504	/* The codec expects the twl4030_audio_data as platform data */
505	cell->platform_data = pdata;
506	cell->pdata_size = sizeof(*pdata);
507	children++;
508	}
509
510	if (pdata->vibra) {
511	cell = &twl6040->cells[children];
512	cell->name = "twl6040-vibra";
513	cell->platform_data = pdata->vibra;
514	cell->pdata_size = sizeof(*pdata->vibra);
515	children++;
516	}
517
518	if (children) {
519	ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
520	children, NULL, 0);
521	if (ret)
522	goto mfd_err;
523	} else {
524	dev_err(&pdev->dev, "No platform data found for children\n");
525	ret = -ENODEV;
526	goto mfd_err;
527	}
528
529	return 0;
530
531	mfd_err:
532	if (twl6040->irq)
533	twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
534	irq_err:
535	if (twl6040->irq)
536	twl6040_irq_exit(twl6040);
537	gpio2_err:
538	if (gpio_is_valid(twl6040->audpwron))
539	gpio_free(twl6040->audpwron);
540	gpio1_err:
541	platform_set_drvdata(pdev, NULL);
542	kfree(twl6040);
543	twl6040_dev = NULL;
544	return ret;
545	}
546
547	static int __devexit twl6040_remove(struct platform_device *pdev)
548	{
549	struct twl6040 *twl6040 = platform_get_drvdata(pdev);
550
551	if (twl6040->power_count)
552	twl6040_power(twl6040, 0);
553
554	if (gpio_is_valid(twl6040->audpwron))
555	gpio_free(twl6040->audpwron);
556
557	twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
558
559	if (twl6040->irq)
560	twl6040_irq_exit(twl6040);
561
562	mfd_remove_devices(&pdev->dev);
563	platform_set_drvdata(pdev, NULL);
564	kfree(twl6040);
565	twl6040_dev = NULL;
566
567	return 0;
568	}
569
570	static struct platform_driver twl6040_driver = {
571	.probe = twl6040_probe,
572	.remove = __devexit_p(twl6040_remove),
573	.driver = {
574	.owner = THIS_MODULE,
575	.name = "twl6040",
576	},
577	};
578
579	static int __devinit twl6040_init(void)
580	{
581	return platform_driver_register(&twl6040_driver);
582	}
583	module_init(twl6040_init);
584
585	static void __devexit twl6040_exit(void)
586	{
587	platform_driver_unregister(&twl6040_driver);
588	}
589
590	module_exit(twl6040_exit);
591
592	MODULE_DESCRIPTION("TWL6040 MFD");
593	MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
594	MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
595	MODULE_LICENSE("GPL");
596	MODULE_ALIAS("platform:twl6040");