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507 lines
12 KiB
507 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* LP8755 High Performance Power Management Unit : System Interface Driver |
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* (based on rev. 0.26) |
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* Copyright 2012 Texas Instruments |
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* |
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* Author: Daniel(Geon Si) Jeong <[email protected]> |
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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/machine.h> |
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#include <linux/platform_data/lp8755.h> |
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#define LP8755_REG_BUCK0 0x00 |
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#define LP8755_REG_BUCK1 0x03 |
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#define LP8755_REG_BUCK2 0x04 |
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#define LP8755_REG_BUCK3 0x01 |
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#define LP8755_REG_BUCK4 0x05 |
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#define LP8755_REG_BUCK5 0x02 |
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#define LP8755_REG_MAX 0xFF |
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#define LP8755_BUCK_EN_M BIT(7) |
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#define LP8755_BUCK_LINEAR_OUT_MAX 0x76 |
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#define LP8755_BUCK_VOUT_M 0x7F |
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struct lp8755_mphase { |
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int nreg; |
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int buck_num[LP8755_BUCK_MAX]; |
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}; |
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struct lp8755_chip { |
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struct device *dev; |
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struct regmap *regmap; |
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struct lp8755_platform_data *pdata; |
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int irq; |
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unsigned int irqmask; |
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int mphase; |
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struct regulator_dev *rdev[LP8755_BUCK_MAX]; |
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}; |
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static int lp8755_buck_enable_time(struct regulator_dev *rdev) |
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{ |
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int ret; |
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unsigned int regval; |
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enum lp8755_bucks id = rdev_get_id(rdev); |
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ret = regmap_read(rdev->regmap, 0x12 + id, ®val); |
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if (ret < 0) { |
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dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
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return ret; |
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} |
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return (regval & 0xff) * 100; |
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} |
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static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) |
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{ |
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int ret; |
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unsigned int regbval = 0x0; |
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enum lp8755_bucks id = rdev_get_id(rdev); |
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struct lp8755_chip *pchip = rdev_get_drvdata(rdev); |
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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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regbval = (0x01 << id); |
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break; |
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case REGULATOR_MODE_NORMAL: |
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/* enable automatic pwm/pfm mode */ |
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ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00); |
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if (ret < 0) |
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goto err_i2c; |
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break; |
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case REGULATOR_MODE_IDLE: |
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/* enable automatic pwm/pfm/lppfm mode */ |
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ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20); |
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if (ret < 0) |
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goto err_i2c; |
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ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01); |
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if (ret < 0) |
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goto err_i2c; |
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break; |
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default: |
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dev_err(pchip->dev, "Not supported buck mode %s\n", __func__); |
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/* forced pwm mode */ |
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regbval = (0x01 << id); |
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} |
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ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval); |
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if (ret < 0) |
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goto err_i2c; |
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return ret; |
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err_i2c: |
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dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
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return ret; |
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} |
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static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev) |
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{ |
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int ret; |
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unsigned int regval; |
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enum lp8755_bucks id = rdev_get_id(rdev); |
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ret = regmap_read(rdev->regmap, 0x06, ®val); |
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if (ret < 0) |
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goto err_i2c; |
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/* mode fast means forced pwm mode */ |
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if (regval & (0x01 << id)) |
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return REGULATOR_MODE_FAST; |
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ret = regmap_read(rdev->regmap, 0x08 + id, ®val); |
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if (ret < 0) |
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goto err_i2c; |
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/* mode idle means automatic pwm/pfm/lppfm mode */ |
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if (regval & 0x20) |
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return REGULATOR_MODE_IDLE; |
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/* mode normal means automatic pwm/pfm mode */ |
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return REGULATOR_MODE_NORMAL; |
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err_i2c: |
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dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
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return 0; |
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} |
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static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp) |
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{ |
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int ret; |
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unsigned int regval = 0x00; |
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enum lp8755_bucks id = rdev_get_id(rdev); |
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/* uV/us */ |
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switch (ramp) { |
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case 0 ... 230: |
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regval = 0x07; |
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break; |
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case 231 ... 470: |
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regval = 0x06; |
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break; |
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case 471 ... 940: |
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regval = 0x05; |
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break; |
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case 941 ... 1900: |
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regval = 0x04; |
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break; |
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case 1901 ... 3800: |
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regval = 0x03; |
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break; |
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case 3801 ... 7500: |
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regval = 0x02; |
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break; |
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case 7501 ... 15000: |
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regval = 0x01; |
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break; |
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case 15001 ... 30000: |
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regval = 0x00; |
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break; |
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default: |
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dev_err(&rdev->dev, |
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"Not supported ramp value %d %s\n", ramp, __func__); |
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return -EINVAL; |
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} |
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ret = regmap_update_bits(rdev->regmap, 0x07 + id, 0x07, regval); |
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if (ret < 0) |
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goto err_i2c; |
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return ret; |
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err_i2c: |
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dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
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return ret; |
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} |
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static const struct regulator_ops lp8755_buck_ops = { |
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.map_voltage = regulator_map_voltage_linear, |
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.list_voltage = regulator_list_voltage_linear, |
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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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.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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.enable_time = lp8755_buck_enable_time, |
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.set_mode = lp8755_buck_set_mode, |
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.get_mode = lp8755_buck_get_mode, |
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.set_ramp_delay = lp8755_buck_set_ramp, |
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}; |
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#define lp8755_rail(_id) "lp8755_buck"#_id |
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#define lp8755_buck_init(_id)\ |
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{\ |
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.constraints = {\ |
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.name = lp8755_rail(_id),\ |
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.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\ |
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.min_uV = 500000,\ |
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.max_uV = 1675000,\ |
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},\ |
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} |
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static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = { |
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[LP8755_BUCK0] = lp8755_buck_init(0), |
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[LP8755_BUCK1] = lp8755_buck_init(1), |
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[LP8755_BUCK2] = lp8755_buck_init(2), |
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[LP8755_BUCK3] = lp8755_buck_init(3), |
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[LP8755_BUCK4] = lp8755_buck_init(4), |
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[LP8755_BUCK5] = lp8755_buck_init(5), |
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}; |
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static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = { |
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{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } }, |
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{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3, |
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LP8755_BUCK4, LP8755_BUCK5 } }, |
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{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, |
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LP8755_BUCK5} }, |
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{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, |
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{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} }, |
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{ 2, { LP8755_BUCK0, LP8755_BUCK5} }, |
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{ 1, { LP8755_BUCK0} }, |
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{ 2, { LP8755_BUCK0, LP8755_BUCK3} }, |
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{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} }, |
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}; |
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static int lp8755_init_data(struct lp8755_chip *pchip) |
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{ |
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unsigned int regval; |
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int ret, icnt, buck_num; |
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struct lp8755_platform_data *pdata = pchip->pdata; |
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/* read back muti-phase configuration */ |
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ret = regmap_read(pchip->regmap, 0x3D, ®val); |
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if (ret < 0) |
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goto out_i2c_error; |
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pchip->mphase = regval & 0x0F; |
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/* set default data based on multi-phase config */ |
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for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { |
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buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; |
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pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num]; |
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} |
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return ret; |
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out_i2c_error: |
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dev_err(pchip->dev, "i2c access error %s\n", __func__); |
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return ret; |
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} |
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#define lp8755_buck_desc(_id)\ |
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{\ |
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.name = lp8755_rail(_id),\ |
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.id = LP8755_BUCK##_id,\ |
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.ops = &lp8755_buck_ops,\ |
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.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\ |
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.uV_step = 10000,\ |
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.min_uV = 500000,\ |
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.type = REGULATOR_VOLTAGE,\ |
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.owner = THIS_MODULE,\ |
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.enable_reg = LP8755_REG_BUCK##_id,\ |
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.enable_mask = LP8755_BUCK_EN_M,\ |
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.vsel_reg = LP8755_REG_BUCK##_id,\ |
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.vsel_mask = LP8755_BUCK_VOUT_M,\ |
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} |
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static const struct regulator_desc lp8755_regulators[] = { |
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lp8755_buck_desc(0), |
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lp8755_buck_desc(1), |
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lp8755_buck_desc(2), |
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lp8755_buck_desc(3), |
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lp8755_buck_desc(4), |
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lp8755_buck_desc(5), |
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}; |
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static int lp8755_regulator_init(struct lp8755_chip *pchip) |
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{ |
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int ret, icnt, buck_num; |
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struct lp8755_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->mphase].nreg; icnt++) { |
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buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; |
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rconfig.init_data = pdata->buck_data[buck_num]; |
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rconfig.of_node = pchip->dev->of_node; |
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pchip->rdev[buck_num] = |
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devm_regulator_register(pchip->dev, |
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&lp8755_regulators[buck_num], &rconfig); |
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if (IS_ERR(pchip->rdev[buck_num])) { |
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ret = PTR_ERR(pchip->rdev[buck_num]); |
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pchip->rdev[buck_num] = NULL; |
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dev_err(pchip->dev, "regulator init failed: buck %d\n", |
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buck_num); |
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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 irqreturn_t lp8755_irq_handler(int irq, void *data) |
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{ |
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int ret, icnt; |
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unsigned int flag0, flag1; |
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struct lp8755_chip *pchip = data; |
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/* read flag0 register */ |
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ret = regmap_read(pchip->regmap, 0x0D, &flag0); |
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if (ret < 0) |
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goto err_i2c; |
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/* clear flag register to pull up int. pin */ |
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ret = regmap_write(pchip->regmap, 0x0D, 0x00); |
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if (ret < 0) |
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goto err_i2c; |
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/* sent power fault detection event to specific regulator */ |
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for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
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if ((flag0 & (0x4 << icnt)) |
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&& (pchip->irqmask & (0x04 << icnt)) |
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&& (pchip->rdev[icnt] != NULL)) { |
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regulator_notifier_call_chain(pchip->rdev[icnt], |
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LP8755_EVENT_PWR_FAULT, |
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NULL); |
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} |
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/* read flag1 register */ |
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ret = regmap_read(pchip->regmap, 0x0E, &flag1); |
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if (ret < 0) |
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goto err_i2c; |
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/* clear flag register to pull up int. pin */ |
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ret = regmap_write(pchip->regmap, 0x0E, 0x00); |
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if (ret < 0) |
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goto err_i2c; |
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/* send OCP event to all regulator devices */ |
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if ((flag1 & 0x01) && (pchip->irqmask & 0x01)) |
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for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
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if (pchip->rdev[icnt] != NULL) { |
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regulator_notifier_call_chain(pchip->rdev[icnt], |
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LP8755_EVENT_OCP, |
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NULL); |
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} |
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/* send OVP event to all regulator devices */ |
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if ((flag1 & 0x02) && (pchip->irqmask & 0x02)) |
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for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
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if (pchip->rdev[icnt] != NULL) { |
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regulator_notifier_call_chain(pchip->rdev[icnt], |
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LP8755_EVENT_OVP, |
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NULL); |
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} |
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return IRQ_HANDLED; |
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err_i2c: |
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dev_err(pchip->dev, "i2c access error %s\n", __func__); |
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return IRQ_NONE; |
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} |
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static int lp8755_int_config(struct lp8755_chip *pchip) |
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{ |
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int ret; |
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unsigned int regval; |
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if (pchip->irq == 0) { |
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dev_warn(pchip->dev, "not use interrupt : %s\n", __func__); |
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return 0; |
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} |
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ret = regmap_read(pchip->regmap, 0x0F, ®val); |
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if (ret < 0) { |
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dev_err(pchip->dev, "i2c access error %s\n", __func__); |
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return ret; |
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} |
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pchip->irqmask = regval; |
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return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL, |
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lp8755_irq_handler, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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"lp8755-irq", pchip); |
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} |
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static const struct regmap_config lp8755_regmap = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = LP8755_REG_MAX, |
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}; |
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static int lp8755_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, icnt; |
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struct lp8755_chip *pchip; |
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struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev); |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_err(&client->dev, "i2c functionality check fail.\n"); |
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return -EOPNOTSUPP; |
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} |
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pchip = devm_kzalloc(&client->dev, |
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sizeof(struct lp8755_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, &lp8755_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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if (pdata != NULL) { |
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pchip->pdata = pdata; |
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pchip->mphase = pdata->mphase; |
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} else { |
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pchip->pdata = devm_kzalloc(pchip->dev, |
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sizeof(struct lp8755_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 = lp8755_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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} |
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ret = lp8755_regulator_init(pchip); |
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if (ret < 0) { |
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dev_err(&client->dev, "fail to initialize regulators\n"); |
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goto err; |
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} |
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pchip->irq = client->irq; |
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ret = lp8755_int_config(pchip); |
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if (ret < 0) { |
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dev_err(&client->dev, "fail to irq config\n"); |
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goto err; |
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} |
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return ret; |
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err: |
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/* output disable */ |
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for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
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regmap_write(pchip->regmap, icnt, 0x00); |
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return ret; |
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} |
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static int lp8755_remove(struct i2c_client *client) |
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{ |
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int icnt; |
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struct lp8755_chip *pchip = i2c_get_clientdata(client); |
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for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
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regmap_write(pchip->regmap, icnt, 0x00); |
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return 0; |
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} |
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static const struct i2c_device_id lp8755_id[] = { |
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{LP8755_NAME, 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, lp8755_id); |
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static struct i2c_driver lp8755_i2c_driver = { |
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.driver = { |
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.name = LP8755_NAME, |
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}, |
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.probe = lp8755_probe, |
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.remove = lp8755_remove, |
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.id_table = lp8755_id, |
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}; |
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static int __init lp8755_init(void) |
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{ |
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return i2c_add_driver(&lp8755_i2c_driver); |
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} |
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subsys_initcall(lp8755_init); |
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static void __exit lp8755_exit(void) |
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{ |
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i2c_del_driver(&lp8755_i2c_driver); |
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} |
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module_exit(lp8755_exit); |
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MODULE_DESCRIPTION("Texas Instruments lp8755 driver"); |
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MODULE_AUTHOR("Daniel Jeong <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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