/*
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* LP8752 High Performance Power Management Unit : System Interface Driver
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*
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* Author: zhangqing <zhangqing@rock-chips.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/regmap.h>
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#include <linux/uaccess.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/machine.h>
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#define LP8752_CTRL_BUCK0 0x02
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#define LP8752_CTRL_BUCK1 0x04
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#define LP8752_CTRL_BUCK2 0x06
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#define LP8752_CTRL_BUCK3 0x08
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#define LP8752_VOUT_BUCK0 0x0a
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#define LP8752_VOUT_BUCK1 0x0c
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#define LP8752_VOUT_BUCK2 0x0e
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#define LP8752_VOUT_BUCK3 0x10
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#define LP8752_BUCK_VSEL_MASK 0xff
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#define LP8752_REG_MAX 0x2f
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enum lp8752_bucks {
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LP8752_BUCK0 = 0,
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LP8752_BUCK1,
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LP8752_BUCK2,
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LP8752_BUCK3,
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LP8752_BUCK_MAX,
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};
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static const struct linear_range lp8752_buck_voltage_ranges[] = {
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REGULATOR_LINEAR_RANGE(500000, 0, 23, 10000),
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REGULATOR_LINEAR_RANGE(735000, 24, 157, 5000),
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REGULATOR_LINEAR_RANGE(1420000, 158, 255, 20000),
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};
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struct lp8752_platform_data {
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int nphase;
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struct device_node *of_node[LP8752_BUCK_MAX];
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struct regulator_desc desc;
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struct regulator_init_data *buck_data[LP8752_BUCK_MAX];
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};
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struct lp8752_mphase {
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int nreg;
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int buck_id[LP8752_BUCK_MAX];
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};
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struct lp8752_chip {
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int nphase;
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struct device *dev;
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struct regmap *regmap;
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struct lp8752_platform_data *pdata;
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struct regulator_dev *rdev[LP8752_BUCK_MAX];
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};
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static int lp8752_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
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u8 msk = BIT(1);
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int ret;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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/* forced pwm mode */
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ret = regmap_update_bits(pchip->regmap,
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rdev->desc->enable_reg,
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msk, 0x1);
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break;
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case REGULATOR_MODE_NORMAL:
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/* automatic pwm/pfm mode */
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ret = regmap_update_bits(pchip->regmap,
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rdev->desc->enable_reg,
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msk, 0x0);
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break;
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default:
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dev_err(pchip->dev, "error:lp8752 only support auto and pwm mode\n");
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static unsigned int lp8752_buck_get_mode(struct regulator_dev *rdev)
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{
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struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
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int ret;
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unsigned int reg;
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ret = regmap_read(pchip->regmap, rdev->desc->enable_reg, ®);
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if (ret < 0) {
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dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
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return ret;
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}
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return (reg & BIT(1)) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
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}
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static struct regulator_ops lp8752_buck_ops = {
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.map_voltage = regulator_map_voltage_linear_range,
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.list_voltage = regulator_list_voltage_linear_range,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_mode = lp8752_buck_set_mode,
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.get_mode = lp8752_buck_get_mode,
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};
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#define lp8752_rail(_id) "lp8752_buck"#_id
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#define vin(_id) "vin"#_id
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static const struct lp8752_mphase mphase_buck[] = {
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{ 1, { LP8752_BUCK0} },
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{ 2, { LP8752_BUCK0, LP8752_BUCK3 } },
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{ 3, { LP8752_BUCK0, LP8752_BUCK2, LP8752_BUCK3 } },
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{ 4, { LP8752_BUCK0, LP8752_BUCK1, LP8752_BUCK2, LP8752_BUCK3 } },
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};
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static struct of_regulator_match lp8752_reg_matches[] = {
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{ .name = "lp8752_buck0", .driver_data = (void *)0 },
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{ .name = "lp8752_buck1", .driver_data = (void *)1 },
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{ .name = "lp8752_buck2", .driver_data = (void *)2 },
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{ .name = "lp8752_buck3", .driver_data = (void *)3 },
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};
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static int lp8752_init_data(struct lp8752_chip *pchip)
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{
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int icnt, buck_id, count;
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struct lp8752_platform_data *pdata = pchip->pdata;
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struct device_node *regs, *lp8752_np;
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lp8752_np = of_node_get(pchip->dev->of_node);
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if (!lp8752_np) {
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dev_err(pchip->dev, "Failed to find device node\n");
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return -ENODEV;
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}
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regs = of_find_node_by_name(lp8752_np, "regulators");
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if (!regs)
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return -ENODEV;
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count = of_regulator_match(pchip->dev, regs, lp8752_reg_matches,
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LP8752_BUCK_MAX);
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of_node_put(regs);
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if ((count <= 0) || (count > LP8752_BUCK_MAX))
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return -ENODEV;
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pchip->nphase = (count - 1) & 0xf;
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/* set default data based on multi-phase config */
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for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
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buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
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pdata->buck_data[buck_id] =
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lp8752_reg_matches[buck_id].init_data;
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pdata->of_node[buck_id] = lp8752_reg_matches[buck_id].of_node;
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}
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return 0;
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}
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#define lp8752_buck_desc(_id)\
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{\
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.name = lp8752_rail(_id),\
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.id = LP8752_BUCK##_id,\
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.supply_name = vin(_id),\
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.ops = &lp8752_buck_ops,\
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.n_voltages = LP8752_BUCK_VSEL_MASK + 1,\
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.linear_ranges = lp8752_buck_voltage_ranges,\
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.n_linear_ranges = ARRAY_SIZE(lp8752_buck_voltage_ranges),\
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.type = REGULATOR_VOLTAGE,\
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.enable_reg = LP8752_CTRL_BUCK##_id,\
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.enable_mask = BIT(7),\
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.vsel_reg = LP8752_VOUT_BUCK##_id,\
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.vsel_mask = LP8752_BUCK_VSEL_MASK,\
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.enable_time = 400,\
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.owner = THIS_MODULE,\
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}
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static struct regulator_desc lp8752_reg_desc[] = {
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lp8752_buck_desc(0),
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lp8752_buck_desc(1),
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lp8752_buck_desc(2),
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lp8752_buck_desc(3),
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};
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static int lp8752_regulator_init(struct lp8752_chip *pchip)
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{
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int ret, icnt, buck_id;
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struct lp8752_platform_data *pdata = pchip->pdata;
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struct regulator_config rconfig = { };
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rconfig.regmap = pchip->regmap;
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rconfig.dev = pchip->dev;
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rconfig.driver_data = pchip;
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for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
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buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
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rconfig.init_data = pdata->buck_data[buck_id];
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rconfig.of_node = pdata->of_node[buck_id];
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pchip->rdev[buck_id] =
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devm_regulator_register(pchip->dev,
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&lp8752_reg_desc[buck_id],
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&rconfig);
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if (IS_ERR(pchip->rdev[buck_id])) {
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ret = PTR_ERR(pchip->rdev[buck_id]);
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pchip->rdev[buck_id] = NULL;
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dev_err(pchip->dev, "regulator init failed: buck %d\n",
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buck_id);
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return ret;
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}
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}
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return 0;
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}
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static const struct regmap_config lp8752_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LP8752_REG_MAX,
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};
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static int lp8752_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct lp8752_chip *pchip;
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struct lp8752_platform_data *pdata = dev_get_platdata(&client->dev);
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pchip = devm_kzalloc(&client->dev,
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sizeof(struct lp8752_chip), GFP_KERNEL);
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if (!pchip)
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return -ENOMEM;
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pchip->dev = &client->dev;
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pchip->regmap = devm_regmap_init_i2c(client, &lp8752_regmap);
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if (IS_ERR(pchip->regmap)) {
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ret = PTR_ERR(pchip->regmap);
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dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
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return ret;
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}
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i2c_set_clientdata(client, pchip);
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ret = regmap_update_bits(pchip->regmap,
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LP8752_CTRL_BUCK0,
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(1 << 0), 0);
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ret = regmap_update_bits(pchip->regmap,
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LP8752_CTRL_BUCK2,
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(1 << 0), 0);
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if (!pdata) {
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pchip->pdata = devm_kzalloc(pchip->dev,
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sizeof(struct lp8752_platform_data),
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GFP_KERNEL);
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if (!pchip->pdata)
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return -ENOMEM;
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ret = lp8752_init_data(pchip);
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if (ret < 0) {
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dev_err(&client->dev, "fail to initialize chip\n");
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return ret;
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}
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} else {
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pchip->pdata = pdata;
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pchip->nphase = pdata->nphase;
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}
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lp8752_regulator_init(pchip);
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return 0;
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}
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static const struct of_device_id lp8752_of_match[] = {
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{ .compatible = "ti,lp8752", },
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{},
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};
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MODULE_DEVICE_TABLE(of, lp8752_of_match);
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static const struct i2c_device_id lp8752_id[] = {
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{"lp8752", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lp8752_id);
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static struct i2c_driver lp8752_i2c_driver = {
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.probe = lp8752_probe,
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.id_table = lp8752_id,
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.driver = {
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.name = "lp8752",
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.of_match_table = of_match_ptr(lp8752_of_match),
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},
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};
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module_i2c_driver(lp8752_i2c_driver);
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MODULE_DESCRIPTION("Texas Instruments lp8752 driver");
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MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
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MODULE_LICENSE("GPL v2");
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