[mirror_ubuntu-zesty-kernel.git] / drivers / regulator / tps6524x-regulator.c

/*
 * Regulator driver for TPS6524x PMIC
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * 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.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>

#define REG_LDO_SET		0x0
#define LDO_ILIM_MASK		1	/* 0 = 400-800, 1 = 900-1500 */
#define LDO_VSEL_MASK		0x0f
#define LDO2_ILIM_SHIFT		12
#define LDO2_VSEL_SHIFT		4
#define LDO1_ILIM_SHIFT		8
#define LDO1_VSEL_SHIFT		0

#define REG_BLOCK_EN		0x1
#define BLOCK_MASK		1
#define BLOCK_LDO1_SHIFT	0
#define BLOCK_LDO2_SHIFT	1
#define BLOCK_LCD_SHIFT		2
#define BLOCK_USB_SHIFT		3

#define REG_DCDC_SET		0x2
#define DCDC_VDCDC_MASK		0x1f
#define DCDC_VDCDC1_SHIFT	0
#define DCDC_VDCDC2_SHIFT	5
#define DCDC_VDCDC3_SHIFT	10

#define REG_DCDC_EN		0x3
#define DCDCDCDC_EN_MASK	0x1
#define DCDCDCDC1_EN_SHIFT	0
#define DCDCDCDC1_PG_MSK	BIT(1)
#define DCDCDCDC2_EN_SHIFT	2
#define DCDCDCDC2_PG_MSK	BIT(3)
#define DCDCDCDC3_EN_SHIFT	4
#define DCDCDCDC3_PG_MSK	BIT(5)

#define REG_USB			0x4
#define USB_ILIM_SHIFT		0
#define USB_ILIM_MASK		0x3
#define USB_TSD_SHIFT		2
#define USB_TSD_MASK		0x3
#define USB_TWARN_SHIFT		4
#define USB_TWARN_MASK		0x3
#define USB_IWARN_SD		BIT(6)
#define USB_FAST_LOOP		BIT(7)

#define REG_ALARM		0x5
#define ALARM_LDO1		BIT(0)
#define ALARM_DCDC1		BIT(1)
#define ALARM_DCDC2		BIT(2)
#define ALARM_DCDC3		BIT(3)
#define ALARM_LDO2		BIT(4)
#define ALARM_USB_WARN		BIT(5)
#define ALARM_USB_ALARM		BIT(6)
#define ALARM_LCD		BIT(9)
#define ALARM_TEMP_WARM		BIT(10)
#define ALARM_TEMP_HOT		BIT(11)
#define ALARM_NRST		BIT(14)
#define ALARM_POWERUP		BIT(15)

#define REG_INT_ENABLE		0x6
#define INT_LDO1		BIT(0)
#define INT_DCDC1		BIT(1)
#define INT_DCDC2		BIT(2)
#define INT_DCDC3		BIT(3)
#define INT_LDO2		BIT(4)
#define INT_USB_WARN		BIT(5)
#define INT_USB_ALARM		BIT(6)
#define INT_LCD			BIT(9)
#define INT_TEMP_WARM		BIT(10)
#define INT_TEMP_HOT		BIT(11)
#define INT_GLOBAL_EN		BIT(15)

#define REG_INT_STATUS		0x7
#define STATUS_LDO1		BIT(0)
#define STATUS_DCDC1		BIT(1)
#define STATUS_DCDC2		BIT(2)
#define STATUS_DCDC3		BIT(3)
#define STATUS_LDO2		BIT(4)
#define STATUS_USB_WARN		BIT(5)
#define STATUS_USB_ALARM	BIT(6)
#define STATUS_LCD		BIT(9)
#define STATUS_TEMP_WARM	BIT(10)
#define STATUS_TEMP_HOT		BIT(11)

#define REG_SOFTWARE_RESET	0xb
#define REG_WRITE_ENABLE	0xd
#define REG_REV_ID		0xf

#define N_DCDC			3
#define N_LDO			2
#define N_SWITCH		2
#define N_REGULATORS		(N_DCDC + N_LDO + N_SWITCH)

#define FIXED_ILIMSEL		BIT(0)
#define FIXED_VOLTAGE		BIT(1)

#define CMD_READ(reg)		((reg) << 6)
#define CMD_WRITE(reg)		(BIT(5) | (reg) << 6)
#define STAT_CLK		BIT(3)
#define STAT_WRITE		BIT(2)
#define STAT_INVALID		BIT(1)
#define STAT_WP			BIT(0)

struct field {
	int		reg;
	int		shift;
	int		mask;
};

struct supply_info {
	const char	*name;
	int		n_voltages;
	const int	*voltages;
	int		fixed_voltage;
	int		n_ilimsels;
	const int	*ilimsels;
	int		fixed_ilimsel;
	int		flags;
	struct field	enable, voltage, ilimsel;
};

struct tps6524x {
	struct device		*dev;
	struct spi_device	*spi;
	struct mutex		lock;
	struct regulator_desc	desc[N_REGULATORS];
	struct regulator_dev	*rdev[N_REGULATORS];
};

static int __read_reg(struct tps6524x *hw, int reg)
{
	int error = 0;
	u16 cmd = CMD_READ(reg), in;
	u8 status;
	struct spi_message m;
	struct spi_transfer t[3];

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &cmd;
	t[0].len = 2;
	t[0].bits_per_word = 12;
	spi_message_add_tail(&t[0], &m);

	t[1].rx_buf = &in;
	t[1].len = 2;
	t[1].bits_per_word = 16;
	spi_message_add_tail(&t[1], &m);

	t[2].rx_buf = &status;
	t[2].len = 1;
	t[2].bits_per_word = 4;
	spi_message_add_tail(&t[2], &m);

	error = spi_sync(hw->spi, &m);
	if (error < 0)
		return error;

	dev_dbg(hw->dev, "read reg %d, data %x, status %x\n",
		reg, in, status);

	if (!(status & STAT_CLK) || (status & STAT_WRITE))
		return -EIO;

	if (status & STAT_INVALID)
		return -EINVAL;

	return in;
}

static int read_reg(struct tps6524x *hw, int reg)
{
	int ret;

	mutex_lock(&hw->lock);
	ret = __read_reg(hw, reg);
	mutex_unlock(&hw->lock);

	return ret;
}

static int __write_reg(struct tps6524x *hw, int reg, int val)
{
	int error = 0;
	u16 cmd = CMD_WRITE(reg), out = val;
	u8 status;
	struct spi_message m;
	struct spi_transfer t[3];

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &cmd;
	t[0].len = 2;
	t[0].bits_per_word = 12;
	spi_message_add_tail(&t[0], &m);

	t[1].tx_buf = &out;
	t[1].len = 2;
	t[1].bits_per_word = 16;
	spi_message_add_tail(&t[1], &m);

	t[2].rx_buf = &status;
	t[2].len = 1;
	t[2].bits_per_word = 4;
	spi_message_add_tail(&t[2], &m);

	error = spi_sync(hw->spi, &m);
	if (error < 0)
		return error;

	dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n",
		reg, out, status);

	if (!(status & STAT_CLK) || !(status & STAT_WRITE))
		return -EIO;

	if (status & (STAT_INVALID | STAT_WP))
		return -EINVAL;

	return error;
}

static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
{
	int ret;

	ret = __read_reg(hw, reg);
	if (ret < 0)
		return ret;

	ret &= ~mask;
	ret |= val;

	ret = __write_reg(hw, reg, ret);

	return (ret < 0) ? ret : 0;
}

static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
{
	int ret;

	mutex_lock(&hw->lock);

	ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
	if (ret) {
		dev_err(hw->dev, "failed to set write enable\n");
		goto error;
	}

	ret = __rmw_reg(hw, reg, mask, val);
	if (ret)
		dev_err(hw->dev, "failed to rmw register %d\n", reg);

	ret = __write_reg(hw, REG_WRITE_ENABLE, 0);
	if (ret) {
		dev_err(hw->dev, "failed to clear write enable\n");
		goto error;
	}

error:
	mutex_unlock(&hw->lock);

	return ret;
}

static int read_field(struct tps6524x *hw, const struct field *field)
{
	int tmp;

	tmp = read_reg(hw, field->reg);
	if (tmp < 0)
		return tmp;

	return (tmp >> field->shift) & field->mask;
}

static int write_field(struct tps6524x *hw, const struct field *field,
		       int val)
{
	if (val & ~field->mask)
		return -EOVERFLOW;

	return rmw_protect(hw, field->reg,
				    field->mask << field->shift,
				    val << field->shift);
}

static const int dcdc1_voltages[] = {
	 800000,  825000,  850000,  875000,
	 900000,  925000,  950000,  975000,
	1000000, 1025000, 1050000, 1075000,
	1100000, 1125000, 1150000, 1175000,
	1200000, 1225000, 1250000, 1275000,
	1300000, 1325000, 1350000, 1375000,
	1400000, 1425000, 1450000, 1475000,
	1500000, 1525000, 1550000, 1575000,
};

static const int dcdc2_voltages[] = {
	1400000, 1450000, 1500000, 1550000,
	1600000, 1650000, 1700000, 1750000,
	1800000, 1850000, 1900000, 1950000,
	2000000, 2050000, 2100000, 2150000,
	2200000, 2250000, 2300000, 2350000,
	2400000, 2450000, 2500000, 2550000,
	2600000, 2650000, 2700000, 2750000,
	2800000, 2850000, 2900000, 2950000,
};

static const int dcdc3_voltages[] = {
	2400000, 2450000, 2500000, 2550000, 2600000,
	2650000, 2700000, 2750000, 2800000, 2850000,
	2900000, 2950000, 3000000, 3050000, 3100000,
	3150000, 3200000, 3250000, 3300000, 3350000,
	3400000, 3450000, 3500000, 3550000, 3600000,
};

static const int ldo1_voltages[] = {
	4300000, 4350000, 4400000, 4450000,
	4500000, 4550000, 4600000, 4650000,
	4700000, 4750000, 4800000, 4850000,
	4900000, 4950000, 5000000, 5050000,
};

static const int ldo2_voltages[] = {
	1100000, 1150000, 1200000, 1250000,
	1300000, 1700000, 1750000, 1800000,
	1850000, 1900000, 3150000, 3200000,
	3250000, 3300000, 3350000, 3400000,
};

static const int ldo_ilimsel[] = {
	400000, 1500000
};

static const int usb_ilimsel[] = {
	200000, 400000, 800000, 1000000
};

#define __MK_FIELD(_reg, _mask, _shift) \
	{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }

static const struct supply_info supply_info[N_REGULATORS] = {
	{
		.name		= "DCDC1",
		.flags		= FIXED_ILIMSEL,
		.n_voltages	= ARRAY_SIZE(dcdc1_voltages),
		.voltages	= dcdc1_voltages,
		.fixed_ilimsel	= 2400000,
		.enable		= __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
					     DCDCDCDC1_EN_SHIFT),
		.voltage	= __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
					     DCDC_VDCDC1_SHIFT),
	},
	{
		.name		= "DCDC2",
		.flags		= FIXED_ILIMSEL,
		.n_voltages	= ARRAY_SIZE(dcdc2_voltages),
		.voltages	= dcdc2_voltages,
		.fixed_ilimsel	= 1200000,
		.enable		= __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
					     DCDCDCDC2_EN_SHIFT),
		.voltage	= __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
					     DCDC_VDCDC2_SHIFT),
	},
	{
		.name		= "DCDC3",
		.flags		= FIXED_ILIMSEL,
		.n_voltages	= ARRAY_SIZE(dcdc3_voltages),
		.voltages	= dcdc3_voltages,
		.fixed_ilimsel	= 1200000,
		.enable		= __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
					DCDCDCDC3_EN_SHIFT),
		.voltage	= __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
					     DCDC_VDCDC3_SHIFT),
	},
	{
		.name		= "LDO1",
		.n_voltages	= ARRAY_SIZE(ldo1_voltages),
		.voltages	= ldo1_voltages,
		.n_ilimsels	= ARRAY_SIZE(ldo_ilimsel),
		.ilimsels	= ldo_ilimsel,
		.enable		= __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
					     BLOCK_LDO1_SHIFT),
		.voltage	= __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
					     LDO1_VSEL_SHIFT),
		.ilimsel	= __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
					     LDO1_ILIM_SHIFT),
	},
	{
		.name		= "LDO2",
		.n_voltages	= ARRAY_SIZE(ldo2_voltages),
		.voltages	= ldo2_voltages,
		.n_ilimsels	= ARRAY_SIZE(ldo_ilimsel),
		.ilimsels	= ldo_ilimsel,
		.enable		= __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
					     BLOCK_LDO2_SHIFT),
		.voltage	= __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
					     LDO2_VSEL_SHIFT),
		.ilimsel	= __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
					     LDO2_ILIM_SHIFT),
	},
	{
		.name		= "USB",
		.flags		= FIXED_VOLTAGE,
		.fixed_voltage	= 5000000,
		.n_ilimsels	= ARRAY_SIZE(usb_ilimsel),
		.ilimsels	= usb_ilimsel,
		.enable		= __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
					     BLOCK_USB_SHIFT),
		.ilimsel	= __MK_FIELD(REG_USB, USB_ILIM_MASK,
					     USB_ILIM_SHIFT),
	},
	{
		.name		= "LCD",
		.flags		= FIXED_VOLTAGE | FIXED_ILIMSEL,
		.fixed_voltage	= 5000000,
		.fixed_ilimsel	=  400000,
		.enable		= __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
					     BLOCK_LCD_SHIFT),
	},
};

static int list_voltage(struct regulator_dev *rdev, unsigned selector)
{
	const struct supply_info *info;
	struct tps6524x *hw;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	if (info->flags & FIXED_VOLTAGE)
		return selector ? -EINVAL : info->fixed_voltage;

	return ((selector < info->n_voltages) ?
		info->voltages[selector] : -EINVAL);
}

static int set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
	const struct supply_info *info;
	struct tps6524x *hw;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	if (info->flags & FIXED_VOLTAGE)
		return -EINVAL;

	return write_field(hw, &info->voltage, selector);
}

static int get_voltage_sel(struct regulator_dev *rdev)
{
	const struct supply_info *info;
	struct tps6524x *hw;
	int ret;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	if (info->flags & FIXED_VOLTAGE)
		return info->fixed_voltage;

	ret = read_field(hw, &info->voltage);
	if (ret < 0)
		return ret;
	if (WARN_ON(ret >= info->n_voltages))
		return -EIO;

	return ret;
}

static int set_current_limit(struct regulator_dev *rdev, int min_uA,
			     int max_uA)
{
	const struct supply_info *info;
	struct tps6524x *hw;
	int i;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	if (info->flags & FIXED_ILIMSEL)
		return -EINVAL;

	for (i = 0; i < info->n_ilimsels; i++)
		if (min_uA <= info->ilimsels[i] &&
		    max_uA >= info->ilimsels[i])
			break;

	if (i >= info->n_ilimsels)
		return -EINVAL;

	return write_field(hw, &info->ilimsel, i);
}

static int get_current_limit(struct regulator_dev *rdev)
{
	const struct supply_info *info;
	struct tps6524x *hw;
	int ret;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	if (info->flags & FIXED_ILIMSEL)
		return info->fixed_ilimsel;

	ret = read_field(hw, &info->ilimsel);
	if (ret < 0)
		return ret;
	if (WARN_ON(ret >= info->n_ilimsels))
		return -EIO;

	return info->ilimsels[ret];
}

static int enable_supply(struct regulator_dev *rdev)
{
	const struct supply_info *info;
	struct tps6524x *hw;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	return write_field(hw, &info->enable, 1);
}

static int disable_supply(struct regulator_dev *rdev)
{
	const struct supply_info *info;
	struct tps6524x *hw;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	return write_field(hw, &info->enable, 0);
}

static int is_supply_enabled(struct regulator_dev *rdev)
{
	const struct supply_info *info;
	struct tps6524x *hw;

	hw	= rdev_get_drvdata(rdev);
	info	= &supply_info[rdev_get_id(rdev)];

	return read_field(hw, &info->enable);
}

static struct regulator_ops regulator_ops = {
	.is_enabled		= is_supply_enabled,
	.enable			= enable_supply,
	.disable		= disable_supply,
	.get_voltage_sel	= get_voltage_sel,
	.set_voltage_sel	= set_voltage_sel,
	.list_voltage		= list_voltage,
	.set_current_limit	= set_current_limit,
	.get_current_limit	= get_current_limit,
};

static int pmic_remove(struct spi_device *spi)
{
	struct tps6524x *hw = spi_get_drvdata(spi);
	int i;

	if (!hw)
		return 0;
	for (i = 0; i < N_REGULATORS; i++) {
		if (hw->rdev[i])
			regulator_unregister(hw->rdev[i]);
		hw->rdev[i] = NULL;
	}
	spi_set_drvdata(spi, NULL);
	kfree(hw);
	return 0;
}

static int __devinit pmic_probe(struct spi_device *spi)
{
	struct tps6524x *hw;
	struct device *dev = &spi->dev;
	const struct supply_info *info = supply_info;
	struct regulator_init_data *init_data;
	int ret = 0, i;

	init_data = dev->platform_data;
	if (!init_data) {
		dev_err(dev, "could not find regulator platform data\n");
		return -EINVAL;
	}

	hw = kzalloc(sizeof(struct tps6524x), GFP_KERNEL);
	if (!hw) {
		dev_err(dev, "cannot allocate regulator private data\n");
		return -ENOMEM;
	}
	spi_set_drvdata(spi, hw);

	memset(hw, 0, sizeof(struct tps6524x));
	hw->dev = dev;
	hw->spi = spi_dev_get(spi);
	mutex_init(&hw->lock);

	for (i = 0; i < N_REGULATORS; i++, info++, init_data++) {
		hw->desc[i].name	= info->name;
		hw->desc[i].id		= i;
		hw->desc[i].n_voltages	= info->n_voltages;
		hw->desc[i].ops		= &regulator_ops;
		hw->desc[i].type	= REGULATOR_VOLTAGE;
		hw->desc[i].owner	= THIS_MODULE;

		if (info->flags & FIXED_VOLTAGE)
			hw->desc[i].n_voltages = 1;

		hw->rdev[i] = regulator_register(&hw->desc[i], dev,
						 init_data, hw, NULL);
		if (IS_ERR(hw->rdev[i])) {
			ret = PTR_ERR(hw->rdev[i]);
			hw->rdev[i] = NULL;
			goto fail;
		}
	}

	return 0;

fail:
	pmic_remove(spi);
	return ret;
}

static struct spi_driver pmic_driver = {
	.probe		= pmic_probe,
	.remove		= __devexit_p(pmic_remove),
	.driver		= {
		.name	= "tps6524x",
		.owner	= THIS_MODULE,
	},
};

module_spi_driver(pmic_driver);

MODULE_DESCRIPTION("TPS6524X PMIC Driver");
MODULE_AUTHOR("Cyril Chemparathy");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:tps6524x");
Commit	Line	Data
1394fd28 CC	1	/*
	2	* Regulator driver for TPS6524x PMIC
	3	*
	4	* Copyright (C) 2010 Texas Instruments
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation version 2.
	9	*
	10	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	11	* whether express or implied; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/err.h>
	19	#include <linux/errno.h>
	20	#include <linux/slab.h>
	21	#include <linux/spi/spi.h>
	22	#include <linux/regulator/driver.h>
	23	#include <linux/regulator/machine.h>
	24
	25	#define REG_LDO_SET 0x0
	26	#define LDO_ILIM_MASK 1 /* 0 = 400-800, 1 = 900-1500 */
	27	#define LDO_VSEL_MASK 0x0f
	28	#define LDO2_ILIM_SHIFT 12
	29	#define LDO2_VSEL_SHIFT 4
	30	#define LDO1_ILIM_SHIFT 8
	31	#define LDO1_VSEL_SHIFT 0
	32
	33	#define REG_BLOCK_EN 0x1
	34	#define BLOCK_MASK 1
	35	#define BLOCK_LDO1_SHIFT 0
	36	#define BLOCK_LDO2_SHIFT 1
	37	#define BLOCK_LCD_SHIFT 2
	38	#define BLOCK_USB_SHIFT 3
	39
	40	#define REG_DCDC_SET 0x2
	41	#define DCDC_VDCDC_MASK 0x1f
	42	#define DCDC_VDCDC1_SHIFT 0
	43	#define DCDC_VDCDC2_SHIFT 5
	44	#define DCDC_VDCDC3_SHIFT 10
	45
	46	#define REG_DCDC_EN 0x3
	47	#define DCDCDCDC_EN_MASK 0x1
	48	#define DCDCDCDC1_EN_SHIFT 0
	49	#define DCDCDCDC1_PG_MSK BIT(1)
	50	#define DCDCDCDC2_EN_SHIFT 2
	51	#define DCDCDCDC2_PG_MSK BIT(3)
	52	#define DCDCDCDC3_EN_SHIFT 4
	53	#define DCDCDCDC3_PG_MSK BIT(5)
	54
	55	#define REG_USB 0x4
	56	#define USB_ILIM_SHIFT 0
	57	#define USB_ILIM_MASK 0x3
	58	#define USB_TSD_SHIFT 2
	59	#define USB_TSD_MASK 0x3
	60	#define USB_TWARN_SHIFT 4
	61	#define USB_TWARN_MASK 0x3
	62	#define USB_IWARN_SD BIT(6)
	63	#define USB_FAST_LOOP BIT(7)
	64
65	#define REG_ALARM 0x5
66	#define ALARM_LDO1 BIT(0)
67	#define ALARM_DCDC1 BIT(1)
68	#define ALARM_DCDC2 BIT(2)
69	#define ALARM_DCDC3 BIT(3)
70	#define ALARM_LDO2 BIT(4)
71	#define ALARM_USB_WARN BIT(5)
72	#define ALARM_USB_ALARM BIT(6)
73	#define ALARM_LCD BIT(9)
74	#define ALARM_TEMP_WARM BIT(10)
75	#define ALARM_TEMP_HOT BIT(11)
76	#define ALARM_NRST BIT(14)
77	#define ALARM_POWERUP BIT(15)
78
79	#define REG_INT_ENABLE 0x6
80	#define INT_LDO1 BIT(0)
81	#define INT_DCDC1 BIT(1)
82	#define INT_DCDC2 BIT(2)
83	#define INT_DCDC3 BIT(3)
84	#define INT_LDO2 BIT(4)
85	#define INT_USB_WARN BIT(5)
86	#define INT_USB_ALARM BIT(6)
87	#define INT_LCD BIT(9)
88	#define INT_TEMP_WARM BIT(10)
89	#define INT_TEMP_HOT BIT(11)
90	#define INT_GLOBAL_EN BIT(15)
91
92	#define REG_INT_STATUS 0x7
93	#define STATUS_LDO1 BIT(0)
94	#define STATUS_DCDC1 BIT(1)
95	#define STATUS_DCDC2 BIT(2)
96	#define STATUS_DCDC3 BIT(3)
97	#define STATUS_LDO2 BIT(4)
98	#define STATUS_USB_WARN BIT(5)
99	#define STATUS_USB_ALARM BIT(6)
100	#define STATUS_LCD BIT(9)
101	#define STATUS_TEMP_WARM BIT(10)
102	#define STATUS_TEMP_HOT BIT(11)
103
104	#define REG_SOFTWARE_RESET 0xb
105	#define REG_WRITE_ENABLE 0xd
106	#define REG_REV_ID 0xf
107
108	#define N_DCDC 3
109	#define N_LDO 2
110	#define N_SWITCH 2
4d984d1c	111	#define N_REGULATORS (N_DCDC + N_LDO + N_SWITCH)
1394fd28 CC	112
	113	#define FIXED_ILIMSEL BIT(0)
	114	#define FIXED_VOLTAGE BIT(1)
	115
	116	#define CMD_READ(reg) ((reg) << 6)
	117	#define CMD_WRITE(reg) (BIT(5) \| (reg) << 6)
	118	#define STAT_CLK BIT(3)
	119	#define STAT_WRITE BIT(2)
	120	#define STAT_INVALID BIT(1)
	121	#define STAT_WP BIT(0)
	122
	123	struct field {
	124	int reg;
	125	int shift;
	126	int mask;
	127	};
	128
	129	struct supply_info {
	130	const char *name;
	131	int n_voltages;
	132	const int *voltages;
	133	int fixed_voltage;
	134	int n_ilimsels;
	135	const int *ilimsels;
	136	int fixed_ilimsel;
	137	int flags;
	138	struct field enable, voltage, ilimsel;
	139	};
	140
	141	struct tps6524x {
	142	struct device *dev;
	143	struct spi_device *spi;
	144	struct mutex lock;
	145	struct regulator_desc desc[N_REGULATORS];
	146	struct regulator_dev *rdev[N_REGULATORS];
	147	};
	148
	149	static int __read_reg(struct tps6524x *hw, int reg)
	150	{
	151	int error = 0;
	152	u16 cmd = CMD_READ(reg), in;
	153	u8 status;
	154	struct spi_message m;
	155	struct spi_transfer t[3];
	156
	157	spi_message_init(&m);
	158	memset(t, 0, sizeof(t));
	159
	160	t[0].tx_buf = &cmd;
	161	t[0].len = 2;
	162	t[0].bits_per_word = 12;
	163	spi_message_add_tail(&t[0], &m);
	164
	165	t[1].rx_buf = &in;
	166	t[1].len = 2;
	167	t[1].bits_per_word = 16;
	168	spi_message_add_tail(&t[1], &m);
	169
	170	t[2].rx_buf = &status;
	171	t[2].len = 1;
	172	t[2].bits_per_word = 4;
	173	spi_message_add_tail(&t[2], &m);
	174
	175	error = spi_sync(hw->spi, &m);
176	if (error < 0)
177	return error;
178
179	dev_dbg(hw->dev, "read reg %d, data %x, status %x\n",
180	reg, in, status);
181
182	if (!(status & STAT_CLK) \|\| (status & STAT_WRITE))
183	return -EIO;
184
185	if (status & STAT_INVALID)
186	return -EINVAL;
187
188	return in;
189	}
190
191	static int read_reg(struct tps6524x *hw, int reg)
192	{
193	int ret;
194
195	mutex_lock(&hw->lock);
196	ret = __read_reg(hw, reg);
197	mutex_unlock(&hw->lock);
198
199	return ret;
200	}
201
202	static int __write_reg(struct tps6524x *hw, int reg, int val)
203	{
204	int error = 0;
205	u16 cmd = CMD_WRITE(reg), out = val;
206	u8 status;
207	struct spi_message m;
208	struct spi_transfer t[3];
209
210	spi_message_init(&m);
211	memset(t, 0, sizeof(t));
212
213	t[0].tx_buf = &cmd;
214	t[0].len = 2;
215	t[0].bits_per_word = 12;
216	spi_message_add_tail(&t[0], &m);
217
218	t[1].tx_buf = &out;
219	t[1].len = 2;
220	t[1].bits_per_word = 16;
221	spi_message_add_tail(&t[1], &m);
222
223	t[2].rx_buf = &status;
224	t[2].len = 1;
225	t[2].bits_per_word = 4;
226	spi_message_add_tail(&t[2], &m);
227
228	error = spi_sync(hw->spi, &m);
229	if (error < 0)
230	return error;
231
232	dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n",
233	reg, out, status);
234
235	if (!(status & STAT_CLK) \|\| !(status & STAT_WRITE))
236	return -EIO;
237
238	if (status & (STAT_INVALID \| STAT_WP))
239	return -EINVAL;
240
241	return error;
242	}
243
244	static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
245	{
246	int ret;
247
248	ret = __read_reg(hw, reg);
249	if (ret < 0)
250	return ret;
251
252	ret &= ~mask;
253	ret \|= val;
254
255	ret = __write_reg(hw, reg, ret);
256
257	return (ret < 0) ? ret : 0;
258	}
259
260	static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
261	{
262	int ret;
263
264	mutex_lock(&hw->lock);
265
266	ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
267	if (ret) {
268	dev_err(hw->dev, "failed to set write enable\n");
269	goto error;
270	}
271
272	ret = __rmw_reg(hw, reg, mask, val);
273	if (ret)
274	dev_err(hw->dev, "failed to rmw register %d\n", reg);
275
276	ret = __write_reg(hw, REG_WRITE_ENABLE, 0);
277	if (ret) {
278	dev_err(hw->dev, "failed to clear write enable\n");
279	goto error;
280	}
281
282	error:
283	mutex_unlock(&hw->lock);
284
285	return ret;
286	}
287
288	static int read_field(struct tps6524x hw, const struct field field)
289	{
290	int tmp;
291
292	tmp = read_reg(hw, field->reg);
293	if (tmp < 0)
294	return tmp;
295
296	return (tmp >> field->shift) & field->mask;
297	}
298
299	static int write_field(struct tps6524x hw, const struct field field,
300	int val)
301	{
302	if (val & ~field->mask)
303	return -EOVERFLOW;
304
305	return rmw_protect(hw, field->reg,
306	field->mask << field->shift,
307	val << field->shift);
308	}
309
310	static const int dcdc1_voltages[] = {
311	800000, 825000, 850000, 875000,
312	900000, 925000, 950000, 975000,
313	1000000, 1025000, 1050000, 1075000,
314	1100000, 1125000, 1150000, 1175000,
315	1200000, 1225000, 1250000, 1275000,
316	1300000, 1325000, 1350000, 1375000,
317	1400000, 1425000, 1450000, 1475000,
318	1500000, 1525000, 1550000, 1575000,
319	};
320
321	static const int dcdc2_voltages[] = {
322	1400000, 1450000, 1500000, 1550000,
323	1600000, 1650000, 1700000, 1750000,
324	1800000, 1850000, 1900000, 1950000,
325	2000000, 2050000, 2100000, 2150000,
326	2200000, 2250000, 2300000, 2350000,
327	2400000, 2450000, 2500000, 2550000,
328	2600000, 2650000, 2700000, 2750000,
329	2800000, 2850000, 2900000, 2950000,
330	};
331
332	static const int dcdc3_voltages[] = {
333	2400000, 2450000, 2500000, 2550000, 2600000,
334	2650000, 2700000, 2750000, 2800000, 2850000,
335	2900000, 2950000, 3000000, 3050000, 3100000,
336	3150000, 3200000, 3250000, 3300000, 3350000,
337	3400000, 3450000, 3500000, 3550000, 3600000,
338	};
339
340	static const int ldo1_voltages[] = {
341	4300000, 4350000, 4400000, 4450000,
342	4500000, 4550000, 4600000, 4650000,
343	4700000, 4750000, 4800000, 4850000,
344	4900000, 4950000, 5000000, 5050000,
345	};
346
347	static const int ldo2_voltages[] = {
348	1100000, 1150000, 1200000, 1250000,
349	1300000, 1700000, 1750000, 1800000,
350	1850000, 1900000, 3150000, 3200000,
351	3250000, 3300000, 3350000, 3400000,
352	};
353
354	static const int ldo_ilimsel[] = {
355	400000, 1500000
356	};
357
358	static const int usb_ilimsel[] = {
359	200000, 400000, 800000, 1000000
360	};
361
362	#define __MK_FIELD(_reg, _mask, _shift) \
363	{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }
364
365	static const struct supply_info supply_info[N_REGULATORS] = {
366	{
367	.name = "DCDC1",
368	.flags = FIXED_ILIMSEL,
369	.n_voltages = ARRAY_SIZE(dcdc1_voltages),
370	.voltages = dcdc1_voltages,
371	.fixed_ilimsel = 2400000,
372	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
373	DCDCDCDC1_EN_SHIFT),
374	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
375	DCDC_VDCDC1_SHIFT),
376	},
377	{
378	.name = "DCDC2",
379	.flags = FIXED_ILIMSEL,
380	.n_voltages = ARRAY_SIZE(dcdc2_voltages),
381	.voltages = dcdc2_voltages,
382	.fixed_ilimsel = 1200000,
383	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
384	DCDCDCDC2_EN_SHIFT),
385	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
386	DCDC_VDCDC2_SHIFT),
387	},
388	{
389	.name = "DCDC3",
390	.flags = FIXED_ILIMSEL,
391	.n_voltages = ARRAY_SIZE(dcdc3_voltages),
392	.voltages = dcdc3_voltages,
393	.fixed_ilimsel = 1200000,
394	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
395	DCDCDCDC3_EN_SHIFT),
396	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
397	DCDC_VDCDC3_SHIFT),
398	},
399	{
400	.name = "LDO1",
401	.n_voltages = ARRAY_SIZE(ldo1_voltages),
402	.voltages = ldo1_voltages,
403	.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
404	.ilimsels = ldo_ilimsel,
405	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
406	BLOCK_LDO1_SHIFT),
407	.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
408	LDO1_VSEL_SHIFT),
409	.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
410	LDO1_ILIM_SHIFT),
411	},
412	{
413	.name = "LDO2",
414	.n_voltages = ARRAY_SIZE(ldo2_voltages),
415	.voltages = ldo2_voltages,
416	.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
417	.ilimsels = ldo_ilimsel,
418	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
419	BLOCK_LDO2_SHIFT),
420	.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
421	LDO2_VSEL_SHIFT),
422	.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
423	LDO2_ILIM_SHIFT),
424	},
425	{
426	.name = "USB",
427	.flags = FIXED_VOLTAGE,
428	.fixed_voltage = 5000000,
429	.n_ilimsels = ARRAY_SIZE(usb_ilimsel),
430	.ilimsels = usb_ilimsel,
431	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
432	BLOCK_USB_SHIFT),
433	.ilimsel = __MK_FIELD(REG_USB, USB_ILIM_MASK,
434	USB_ILIM_SHIFT),
435	},
436	{
437	.name = "LCD",
438	.flags = FIXED_VOLTAGE \| FIXED_ILIMSEL,
439	.fixed_voltage = 5000000,
440	.fixed_ilimsel = 400000,
441	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
442	BLOCK_LCD_SHIFT),
443	},
444	};
445
446	static int list_voltage(struct regulator_dev *rdev, unsigned selector)
447	{
448	const struct supply_info *info;
449	struct tps6524x *hw;
450
451	hw = rdev_get_drvdata(rdev);
452	info = &supply_info[rdev_get_id(rdev)];
453
454	if (info->flags & FIXED_VOLTAGE)
455	return selector ? -EINVAL : info->fixed_voltage;
456
457	return ((selector < info->n_voltages) ?
458	info->voltages[selector] : -EINVAL);
459	}
460
f8ee3393	461	static int set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
1394fd28 CC	462	{
	463	const struct supply_info *info;
	464	struct tps6524x *hw;
1394fd28 CC	465
	466	hw = rdev_get_drvdata(rdev);
	467	info = &supply_info[rdev_get_id(rdev)];
	468
	469	if (info->flags & FIXED_VOLTAGE)
	470	return -EINVAL;
	471
f8ee3393	472	return write_field(hw, &info->voltage, selector);
1394fd28 CC	473	}
1394fd28 CC	474
4af7c1d3	475	static int get_voltage_sel(struct regulator_dev *rdev)
1394fd28 CC	476	{
	477	const struct supply_info *info;
	478	struct tps6524x *hw;
	479	int ret;
	480
	481	hw = rdev_get_drvdata(rdev);
	482	info = &supply_info[rdev_get_id(rdev)];
	483
	484	if (info->flags & FIXED_VOLTAGE)
	485	return info->fixed_voltage;
	486
	487	ret = read_field(hw, &info->voltage);
	488	if (ret < 0)
	489	return ret;
	490	if (WARN_ON(ret >= info->n_voltages))
	491	return -EIO;
	492
4af7c1d3	493	return ret;
1394fd28 CC	494	}
	495
	496	static int set_current_limit(struct regulator_dev *rdev, int min_uA,
	497	int max_uA)
	498	{
	499	const struct supply_info *info;
	500	struct tps6524x *hw;
	501	int i;
	502
	503	hw = rdev_get_drvdata(rdev);
	504	info = &supply_info[rdev_get_id(rdev)];
	505
	506	if (info->flags & FIXED_ILIMSEL)
	507	return -EINVAL;
	508
	509	for (i = 0; i < info->n_ilimsels; i++)
	510	if (min_uA <= info->ilimsels[i] &&
	511	max_uA >= info->ilimsels[i])
	512	break;
	513
	514	if (i >= info->n_ilimsels)
	515	return -EINVAL;
	516
	517	return write_field(hw, &info->ilimsel, i);
	518	}
	519
	520	static int get_current_limit(struct regulator_dev *rdev)
	521	{
	522	const struct supply_info *info;
	523	struct tps6524x *hw;
	524	int ret;
	525
	526	hw = rdev_get_drvdata(rdev);
	527	info = &supply_info[rdev_get_id(rdev)];
	528
	529	if (info->flags & FIXED_ILIMSEL)
	530	return info->fixed_ilimsel;
	531
	532	ret = read_field(hw, &info->ilimsel);
	533	if (ret < 0)
	534	return ret;
	535	if (WARN_ON(ret >= info->n_ilimsels))
	536	return -EIO;
	537
	538	return info->ilimsels[ret];
	539	}
	540
	541	static int enable_supply(struct regulator_dev *rdev)
	542	{
	543	const struct supply_info *info;
	544	struct tps6524x *hw;
	545
	546	hw = rdev_get_drvdata(rdev);
	547	info = &supply_info[rdev_get_id(rdev)];
	548
	549	return write_field(hw, &info->enable, 1);
	550	}
	551
	552	static int disable_supply(struct regulator_dev *rdev)
	553	{
	554	const struct supply_info *info;
	555	struct tps6524x *hw;
	556
	557	hw = rdev_get_drvdata(rdev);
558	info = &supply_info[rdev_get_id(rdev)];
559
560	return write_field(hw, &info->enable, 0);
561	}
562
563	static int is_supply_enabled(struct regulator_dev *rdev)
564	{
565	const struct supply_info *info;
566	struct tps6524x *hw;
567
568	hw = rdev_get_drvdata(rdev);
569	info = &supply_info[rdev_get_id(rdev)];
570
571	return read_field(hw, &info->enable);
572	}
573
574	static struct regulator_ops regulator_ops = {
575	.is_enabled = is_supply_enabled,
576	.enable = enable_supply,
577	.disable = disable_supply,
4af7c1d3	578	.get_voltage_sel = get_voltage_sel,
f8ee3393	579	.set_voltage_sel = set_voltage_sel,
1394fd28 CC	580	.list_voltage = list_voltage,
	581	.set_current_limit = set_current_limit,
	582	.get_current_limit = get_current_limit,
	583	};
	584
5362b098	585	static int pmic_remove(struct spi_device *spi)
1394fd28 CC	586	{
	587	struct tps6524x *hw = spi_get_drvdata(spi);
	588	int i;
	589
	590	if (!hw)
	591	return 0;
	592	for (i = 0; i < N_REGULATORS; i++) {
	593	if (hw->rdev[i])
	594	regulator_unregister(hw->rdev[i]);
	595	hw->rdev[i] = NULL;
	596	}
	597	spi_set_drvdata(spi, NULL);
	598	kfree(hw);
	599	return 0;
	600	}
	601
	602	static int __devinit pmic_probe(struct spi_device *spi)
	603	{
	604	struct tps6524x *hw;
	605	struct device *dev = &spi->dev;
	606	const struct supply_info *info = supply_info;
	607	struct regulator_init_data *init_data;
	608	int ret = 0, i;
	609
	610	init_data = dev->platform_data;
	611	if (!init_data) {
	612	dev_err(dev, "could not find regulator platform data\n");
	613	return -EINVAL;
	614	}
	615
	616	hw = kzalloc(sizeof(struct tps6524x), GFP_KERNEL);
	617	if (!hw) {
	618	dev_err(dev, "cannot allocate regulator private data\n");
	619	return -ENOMEM;
	620	}
	621	spi_set_drvdata(spi, hw);
	622
	623	memset(hw, 0, sizeof(struct tps6524x));
	624	hw->dev = dev;
	625	hw->spi = spi_dev_get(spi);
	626	mutex_init(&hw->lock);
	627
	628	for (i = 0; i < N_REGULATORS; i++, info++, init_data++) {
	629	hw->desc[i].name = info->name;
	630	hw->desc[i].id = i;
	631	hw->desc[i].n_voltages = info->n_voltages;
	632	hw->desc[i].ops = &regulator_ops;
	633	hw->desc[i].type = REGULATOR_VOLTAGE;
	634	hw->desc[i].owner = THIS_MODULE;
	635
	636	if (info->flags & FIXED_VOLTAGE)
	637	hw->desc[i].n_voltages = 1;
	638
	639	hw->rdev[i] = regulator_register(&hw->desc[i], dev,
2c043bcb	640	init_data, hw, NULL);
1394fd28 CC	641	if (IS_ERR(hw->rdev[i])) {
	642	ret = PTR_ERR(hw->rdev[i]);
	643	hw->rdev[i] = NULL;
	644	goto fail;
	645	}
	646	}
	647
	648	return 0;
	649
	650	fail:
	651	pmic_remove(spi);
	652	return ret;
	653	}
	654
	655	static struct spi_driver pmic_driver = {
	656	.probe = pmic_probe,
	657	.remove = __devexit_p(pmic_remove),
	658	.driver = {
	659	.name = "tps6524x",
	660	.owner = THIS_MODULE,
	661	},
	662	};
	663
173f24d1	664	module_spi_driver(pmic_driver);
1394fd28 CC	665
	666	MODULE_DESCRIPTION("TPS6524X PMIC Driver");
	667	MODULE_AUTHOR("Cyril Chemparathy");
	668	MODULE_LICENSE("GPL");
	669	MODULE_ALIAS("spi:tps6524x");