[deliverable/linux.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 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 unsigned int *voltages;
	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 unsigned 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 unsigned 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 unsigned 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 unsigned int ldo1_voltages[] = {
	4300000, 4350000, 4400000, 4450000,
	4500000, 4550000, 4600000, 4650000,
	4700000, 4750000, 4800000, 4850000,
	4900000, 4950000, 5000000, 5050000,
};

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

static const unsigned int fixed_5000000_voltage[] = {
	5000000
};

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",
		.n_voltages	= ARRAY_SIZE(fixed_5000000_voltage),
		.voltages	= fixed_5000000_voltage,
		.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",
		.n_voltages	= ARRAY_SIZE(fixed_5000000_voltage),
		.voltages	= fixed_5000000_voltage,
		.flags		= FIXED_ILIMSEL,
		.fixed_ilimsel	=  400000,
		.enable		= __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
					     BLOCK_LCD_SHIFT),
	},
};

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 (rdev->desc->n_voltages == 1)
		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 (rdev->desc->n_voltages == 1)
		return 0;

	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		= regulator_list_voltage_table,
	.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);
	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;
	struct regulator_config config = { };
	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 = devm_kzalloc(&spi->dev, 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].volt_table	= info->voltages;
		hw->desc[i].ops		= &regulator_ops;
		hw->desc[i].type	= REGULATOR_VOLTAGE;
		hw->desc[i].owner	= THIS_MODULE;

		config.dev = dev;
		config.init_data = init_data;
		config.driver_data = hw;

		hw->rdev[i] = regulator_register(&hw->desc[i], &config);
		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
1394fd28 CC	113	#define FIXED_ILIMSEL BIT(0)
1394fd28 CC	114
	115	#define CMD_READ(reg) ((reg) << 6)
	116	#define CMD_WRITE(reg) (BIT(5) \| (reg) << 6)
	117	#define STAT_CLK BIT(3)
	118	#define STAT_WRITE BIT(2)
	119	#define STAT_INVALID BIT(1)
	120	#define STAT_WP BIT(0)
	121
	122	struct field {
	123	int reg;
	124	int shift;
	125	int mask;
	126	};
	127
	128	struct supply_info {
	129	const char *name;
	130	int n_voltages;
cac87fd3	131	const unsigned int *voltages;
1394fd28 CC	132	int n_ilimsels;
	133	const int *ilimsels;
	134	int fixed_ilimsel;
	135	int flags;
	136	struct field enable, voltage, ilimsel;
	137	};
	138
	139	struct tps6524x {
	140	struct device *dev;
	141	struct spi_device *spi;
	142	struct mutex lock;
	143	struct regulator_desc desc[N_REGULATORS];
	144	struct regulator_dev *rdev[N_REGULATORS];
	145	};
	146
	147	static int __read_reg(struct tps6524x *hw, int reg)
	148	{
	149	int error = 0;
	150	u16 cmd = CMD_READ(reg), in;
	151	u8 status;
	152	struct spi_message m;
	153	struct spi_transfer t[3];
	154
	155	spi_message_init(&m);
	156	memset(t, 0, sizeof(t));
	157
	158	t[0].tx_buf = &cmd;
	159	t[0].len = 2;
	160	t[0].bits_per_word = 12;
	161	spi_message_add_tail(&t[0], &m);
	162
	163	t[1].rx_buf = &in;
	164	t[1].len = 2;
	165	t[1].bits_per_word = 16;
	166	spi_message_add_tail(&t[1], &m);
	167
	168	t[2].rx_buf = &status;
	169	t[2].len = 1;
	170	t[2].bits_per_word = 4;
	171	spi_message_add_tail(&t[2], &m);
	172
	173	error = spi_sync(hw->spi, &m);
	174	if (error < 0)
	175	return error;
	176
	177	dev_dbg(hw->dev, "read reg %d, data %x, status %x\n",
	178	reg, in, status);
	179
	180	if (!(status & STAT_CLK) \|\| (status & STAT_WRITE))
	181	return -EIO;
	182
	183	if (status & STAT_INVALID)
	184	return -EINVAL;
	185
	186	return in;
	187	}
	188
	189	static int read_reg(struct tps6524x *hw, int reg)
	190	{
	191	int ret;
	192
	193	mutex_lock(&hw->lock);
	194	ret = __read_reg(hw, reg);
	195	mutex_unlock(&hw->lock);
196
197	return ret;
198	}
199
200	static int __write_reg(struct tps6524x *hw, int reg, int val)
201	{
202	int error = 0;
203	u16 cmd = CMD_WRITE(reg), out = val;
204	u8 status;
205	struct spi_message m;
206	struct spi_transfer t[3];
207
208	spi_message_init(&m);
209	memset(t, 0, sizeof(t));
210
211	t[0].tx_buf = &cmd;
212	t[0].len = 2;
213	t[0].bits_per_word = 12;
214	spi_message_add_tail(&t[0], &m);
215
216	t[1].tx_buf = &out;
217	t[1].len = 2;
218	t[1].bits_per_word = 16;
219	spi_message_add_tail(&t[1], &m);
220
221	t[2].rx_buf = &status;
222	t[2].len = 1;
223	t[2].bits_per_word = 4;
224	spi_message_add_tail(&t[2], &m);
225
226	error = spi_sync(hw->spi, &m);
227	if (error < 0)
228	return error;
229
230	dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n",
231	reg, out, status);
232
233	if (!(status & STAT_CLK) \|\| !(status & STAT_WRITE))
234	return -EIO;
235
236	if (status & (STAT_INVALID \| STAT_WP))
237	return -EINVAL;
238
239	return error;
240	}
241
242	static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
243	{
244	int ret;
245
246	ret = __read_reg(hw, reg);
247	if (ret < 0)
248	return ret;
249
250	ret &= ~mask;
251	ret \|= val;
252
253	ret = __write_reg(hw, reg, ret);
254
255	return (ret < 0) ? ret : 0;
256	}
257
258	static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
259	{
260	int ret;
261
262	mutex_lock(&hw->lock);
263
264	ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
265	if (ret) {
266	dev_err(hw->dev, "failed to set write enable\n");
267	goto error;
268	}
269
270	ret = __rmw_reg(hw, reg, mask, val);
271	if (ret)
272	dev_err(hw->dev, "failed to rmw register %d\n", reg);
273
274	ret = __write_reg(hw, REG_WRITE_ENABLE, 0);
275	if (ret) {
276	dev_err(hw->dev, "failed to clear write enable\n");
277	goto error;
278	}
279
280	error:
281	mutex_unlock(&hw->lock);
282
283	return ret;
284	}
285
286	static int read_field(struct tps6524x hw, const struct field field)
287	{
288	int tmp;
289
290	tmp = read_reg(hw, field->reg);
291	if (tmp < 0)
292	return tmp;
293
294	return (tmp >> field->shift) & field->mask;
295	}
296
297	static int write_field(struct tps6524x hw, const struct field field,
298	int val)
299	{
300	if (val & ~field->mask)
301	return -EOVERFLOW;
302
303	return rmw_protect(hw, field->reg,
304	field->mask << field->shift,
305	val << field->shift);
306	}
307
cac87fd3	308	static const unsigned int dcdc1_voltages[] = {
1394fd28 CC	309	800000, 825000, 850000, 875000,
	310	900000, 925000, 950000, 975000,
	311	1000000, 1025000, 1050000, 1075000,
	312	1100000, 1125000, 1150000, 1175000,
	313	1200000, 1225000, 1250000, 1275000,
	314	1300000, 1325000, 1350000, 1375000,
	315	1400000, 1425000, 1450000, 1475000,
	316	1500000, 1525000, 1550000, 1575000,
	317	};
	318
cac87fd3	319	static const unsigned int dcdc2_voltages[] = {
1394fd28 CC	320	1400000, 1450000, 1500000, 1550000,
	321	1600000, 1650000, 1700000, 1750000,
	322	1800000, 1850000, 1900000, 1950000,
	323	2000000, 2050000, 2100000, 2150000,
	324	2200000, 2250000, 2300000, 2350000,
	325	2400000, 2450000, 2500000, 2550000,
	326	2600000, 2650000, 2700000, 2750000,
	327	2800000, 2850000, 2900000, 2950000,
	328	};
	329
cac87fd3	330	static const unsigned int dcdc3_voltages[] = {
1394fd28 CC	331	2400000, 2450000, 2500000, 2550000, 2600000,
	332	2650000, 2700000, 2750000, 2800000, 2850000,
	333	2900000, 2950000, 3000000, 3050000, 3100000,
	334	3150000, 3200000, 3250000, 3300000, 3350000,
	335	3400000, 3450000, 3500000, 3550000, 3600000,
	336	};
	337
cac87fd3	338	static const unsigned int ldo1_voltages[] = {
1394fd28 CC	339	4300000, 4350000, 4400000, 4450000,
	340	4500000, 4550000, 4600000, 4650000,
	341	4700000, 4750000, 4800000, 4850000,
	342	4900000, 4950000, 5000000, 5050000,
	343	};
	344
cac87fd3	345	static const unsigned int ldo2_voltages[] = {
1394fd28 CC	346	1100000, 1150000, 1200000, 1250000,
	347	1300000, 1700000, 1750000, 1800000,
	348	1850000, 1900000, 3150000, 3200000,
	349	3250000, 3300000, 3350000, 3400000,
	350	};
	351
cac87fd3 AL	352	static const unsigned int fixed_5000000_voltage[] = {
	353	5000000
	354	};
	355
1394fd28 CC	356	static const int ldo_ilimsel[] = {
	357	400000, 1500000
	358	};
	359
	360	static const int usb_ilimsel[] = {
	361	200000, 400000, 800000, 1000000
	362	};
	363
	364	#define __MK_FIELD(_reg, _mask, _shift) \
	365	{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }
	366
	367	static const struct supply_info supply_info[N_REGULATORS] = {
	368	{
	369	.name = "DCDC1",
	370	.flags = FIXED_ILIMSEL,
	371	.n_voltages = ARRAY_SIZE(dcdc1_voltages),
	372	.voltages = dcdc1_voltages,
	373	.fixed_ilimsel = 2400000,
	374	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
	375	DCDCDCDC1_EN_SHIFT),
	376	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
	377	DCDC_VDCDC1_SHIFT),
	378	},
	379	{
	380	.name = "DCDC2",
	381	.flags = FIXED_ILIMSEL,
	382	.n_voltages = ARRAY_SIZE(dcdc2_voltages),
	383	.voltages = dcdc2_voltages,
	384	.fixed_ilimsel = 1200000,
	385	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
	386	DCDCDCDC2_EN_SHIFT),
	387	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
	388	DCDC_VDCDC2_SHIFT),
	389	},
	390	{
	391	.name = "DCDC3",
	392	.flags = FIXED_ILIMSEL,
	393	.n_voltages = ARRAY_SIZE(dcdc3_voltages),
	394	.voltages = dcdc3_voltages,
	395	.fixed_ilimsel = 1200000,
	396	.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
	397	DCDCDCDC3_EN_SHIFT),
	398	.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
	399	DCDC_VDCDC3_SHIFT),
	400	},
	401	{
	402	.name = "LDO1",
	403	.n_voltages = ARRAY_SIZE(ldo1_voltages),
	404	.voltages = ldo1_voltages,
	405	.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
	406	.ilimsels = ldo_ilimsel,
	407	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
	408	BLOCK_LDO1_SHIFT),
	409	.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
	410	LDO1_VSEL_SHIFT),
	411	.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
	412	LDO1_ILIM_SHIFT),
	413	},
	414	{
	415	.name = "LDO2",
	416	.n_voltages = ARRAY_SIZE(ldo2_voltages),
	417	.voltages = ldo2_voltages,
	418	.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
	419	.ilimsels = ldo_ilimsel,
420	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
421	BLOCK_LDO2_SHIFT),
422	.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
423	LDO2_VSEL_SHIFT),
424	.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
425	LDO2_ILIM_SHIFT),
426	},
427	{
428	.name = "USB",
cac87fd3 AL	429	.n_voltages = ARRAY_SIZE(fixed_5000000_voltage),
cac87fd3 AL	430	.voltages = fixed_5000000_voltage,
1394fd28 CC	431	.n_ilimsels = ARRAY_SIZE(usb_ilimsel),
	432	.ilimsels = usb_ilimsel,
	433	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
	434	BLOCK_USB_SHIFT),
	435	.ilimsel = __MK_FIELD(REG_USB, USB_ILIM_MASK,
	436	USB_ILIM_SHIFT),
	437	},
	438	{
	439	.name = "LCD",
cac87fd3 AL	440	.n_voltages = ARRAY_SIZE(fixed_5000000_voltage),
	441	.voltages = fixed_5000000_voltage,
	442	.flags = FIXED_ILIMSEL,
1394fd28 CC	443	.fixed_ilimsel = 400000,
	444	.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
	445	BLOCK_LCD_SHIFT),
	446	},
	447	};
	448
f8ee3393	449	static int set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
1394fd28 CC	450	{
	451	const struct supply_info *info;
	452	struct tps6524x *hw;
1394fd28 CC	453
	454	hw = rdev_get_drvdata(rdev);
	455	info = &supply_info[rdev_get_id(rdev)];
	456
cac87fd3	457	if (rdev->desc->n_voltages == 1)
1394fd28 CC	458	return -EINVAL;
1394fd28 CC	459
f8ee3393	460	return write_field(hw, &info->voltage, selector);
1394fd28 CC	461	}
1394fd28 CC	462
4af7c1d3	463	static int get_voltage_sel(struct regulator_dev *rdev)
1394fd28 CC	464	{
	465	const struct supply_info *info;
	466	struct tps6524x *hw;
	467	int ret;
	468
	469	hw = rdev_get_drvdata(rdev);
	470	info = &supply_info[rdev_get_id(rdev)];
	471
cac87fd3	472	if (rdev->desc->n_voltages == 1)
8386a00f	473	return 0;
1394fd28 CC	474
	475	ret = read_field(hw, &info->voltage);
	476	if (ret < 0)
	477	return ret;
	478	if (WARN_ON(ret >= info->n_voltages))
	479	return -EIO;
	480
4af7c1d3	481	return ret;
1394fd28 CC	482	}
	483
	484	static int set_current_limit(struct regulator_dev *rdev, int min_uA,
	485	int max_uA)
	486	{
	487	const struct supply_info *info;
	488	struct tps6524x *hw;
	489	int i;
	490
	491	hw = rdev_get_drvdata(rdev);
	492	info = &supply_info[rdev_get_id(rdev)];
	493
	494	if (info->flags & FIXED_ILIMSEL)
	495	return -EINVAL;
	496
	497	for (i = 0; i < info->n_ilimsels; i++)
	498	if (min_uA <= info->ilimsels[i] &&
	499	max_uA >= info->ilimsels[i])
	500	break;
	501
	502	if (i >= info->n_ilimsels)
	503	return -EINVAL;
	504
	505	return write_field(hw, &info->ilimsel, i);
	506	}
	507
	508	static int get_current_limit(struct regulator_dev *rdev)
	509	{
	510	const struct supply_info *info;
	511	struct tps6524x *hw;
	512	int ret;
	513
	514	hw = rdev_get_drvdata(rdev);
	515	info = &supply_info[rdev_get_id(rdev)];
	516
	517	if (info->flags & FIXED_ILIMSEL)
	518	return info->fixed_ilimsel;
	519
	520	ret = read_field(hw, &info->ilimsel);
	521	if (ret < 0)
	522	return ret;
	523	if (WARN_ON(ret >= info->n_ilimsels))
	524	return -EIO;
	525
	526	return info->ilimsels[ret];
	527	}
	528
	529	static int enable_supply(struct regulator_dev *rdev)
	530	{
	531	const struct supply_info *info;
	532	struct tps6524x *hw;
	533
	534	hw = rdev_get_drvdata(rdev);
	535	info = &supply_info[rdev_get_id(rdev)];
	536
	537	return write_field(hw, &info->enable, 1);
	538	}
	539
	540	static int disable_supply(struct regulator_dev *rdev)
	541	{
	542	const struct supply_info *info;
	543	struct tps6524x *hw;
	544
	545	hw = rdev_get_drvdata(rdev);
546	info = &supply_info[rdev_get_id(rdev)];
547
548	return write_field(hw, &info->enable, 0);
549	}
550
551	static int is_supply_enabled(struct regulator_dev *rdev)
552	{
553	const struct supply_info *info;
554	struct tps6524x *hw;
555
556	hw = rdev_get_drvdata(rdev);
557	info = &supply_info[rdev_get_id(rdev)];
558
559	return read_field(hw, &info->enable);
560	}
561
562	static struct regulator_ops regulator_ops = {
563	.is_enabled = is_supply_enabled,
564	.enable = enable_supply,
565	.disable = disable_supply,
4af7c1d3	566	.get_voltage_sel = get_voltage_sel,
f8ee3393	567	.set_voltage_sel = set_voltage_sel,
cac87fd3	568	.list_voltage = regulator_list_voltage_table,
1394fd28 CC	569	.set_current_limit = set_current_limit,
	570	.get_current_limit = get_current_limit,
	571	};
	572
5362b098	573	static int pmic_remove(struct spi_device *spi)
1394fd28 CC	574	{
	575	struct tps6524x *hw = spi_get_drvdata(spi);
	576	int i;
	577
	578	if (!hw)
	579	return 0;
	580	for (i = 0; i < N_REGULATORS; i++) {
	581	if (hw->rdev[i])
	582	regulator_unregister(hw->rdev[i]);
	583	hw->rdev[i] = NULL;
	584	}
	585	spi_set_drvdata(spi, NULL);
1394fd28 CC	586	return 0;
	587	}
	588
	589	static int __devinit pmic_probe(struct spi_device *spi)
	590	{
	591	struct tps6524x *hw;
	592	struct device *dev = &spi->dev;
	593	const struct supply_info *info = supply_info;
	594	struct regulator_init_data *init_data;
c172708d	595	struct regulator_config config = { };
1394fd28 CC	596	int ret = 0, i;
	597
	598	init_data = dev->platform_data;
	599	if (!init_data) {
	600	dev_err(dev, "could not find regulator platform data\n");
	601	return -EINVAL;
	602	}
	603
9eb0c421	604	hw = devm_kzalloc(&spi->dev, sizeof(struct tps6524x), GFP_KERNEL);
1394fd28 CC	605	if (!hw) {
	606	dev_err(dev, "cannot allocate regulator private data\n");
	607	return -ENOMEM;
	608	}
	609	spi_set_drvdata(spi, hw);
	610
	611	memset(hw, 0, sizeof(struct tps6524x));
	612	hw->dev = dev;
	613	hw->spi = spi_dev_get(spi);
	614	mutex_init(&hw->lock);
	615
	616	for (i = 0; i < N_REGULATORS; i++, info++, init_data++) {
	617	hw->desc[i].name = info->name;
	618	hw->desc[i].id = i;
	619	hw->desc[i].n_voltages = info->n_voltages;
cac87fd3	620	hw->desc[i].volt_table = info->voltages;
1394fd28 CC	621	hw->desc[i].ops = &regulator_ops;
	622	hw->desc[i].type = REGULATOR_VOLTAGE;
	623	hw->desc[i].owner = THIS_MODULE;
	624
c172708d MB	625	config.dev = dev;
	626	config.init_data = init_data;
	627	config.driver_data = hw;
	628
	629	hw->rdev[i] = regulator_register(&hw->desc[i], &config);
1394fd28 CC	630	if (IS_ERR(hw->rdev[i])) {
	631	ret = PTR_ERR(hw->rdev[i]);
	632	hw->rdev[i] = NULL;
	633	goto fail;
	634	}
	635	}
	636
	637	return 0;
	638
	639	fail:
	640	pmic_remove(spi);
	641	return ret;
	642	}
	643
	644	static struct spi_driver pmic_driver = {
	645	.probe = pmic_probe,
	646	.remove = __devexit_p(pmic_remove),
	647	.driver = {
	648	.name = "tps6524x",
	649	.owner = THIS_MODULE,
	650	},
	651	};
	652
173f24d1	653	module_spi_driver(pmic_driver);
1394fd28 CC	654
	655	MODULE_DESCRIPTION("TPS6524X PMIC Driver");
	656	MODULE_AUTHOR("Cyril Chemparathy");
	657	MODULE_LICENSE("GPL");
	658	MODULE_ALIAS("spi:tps6524x");