428 lines
11 KiB
C
428 lines
11 KiB
C
/*
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* pv88090-regulator.c - Regulator device driver for PV88090
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* Copyright (C) 2015 Powerventure Semiconductor Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.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/regmap.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/regulator/of_regulator.h>
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#include "pv88090-regulator.h"
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#define PV88090_MAX_REGULATORS 5
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/* PV88090 REGULATOR IDs */
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enum {
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/* BUCKs */
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PV88090_ID_BUCK1,
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PV88090_ID_BUCK2,
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PV88090_ID_BUCK3,
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/* LDOs */
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PV88090_ID_LDO1,
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PV88090_ID_LDO2,
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};
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struct pv88090_regulator {
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struct regulator_desc desc;
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unsigned int conf;
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unsigned int conf2;
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};
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struct pv88090 {
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struct device *dev;
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struct regmap *regmap;
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struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
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};
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struct pv88090_buck_voltage {
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int min_uV;
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int max_uV;
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int uV_step;
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};
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static const struct regmap_config pv88090_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
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* Entry indexes corresponds to register values.
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*/
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static const unsigned int pv88090_buck1_limits[] = {
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220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
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1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
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3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
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5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
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};
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static const unsigned int pv88090_buck23_limits[] = {
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1496000, 2393000, 3291000, 4189000
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};
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static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
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{
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.min_uV = 600000,
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.max_uV = 1393750,
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.uV_step = 6250,
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},
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{
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.min_uV = 1400000,
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.max_uV = 2193750,
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.uV_step = 6250,
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},
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{
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.min_uV = 1250000,
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.max_uV = 2837500,
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.uV_step = 12500,
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},
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};
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static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
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{
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struct pv88090_regulator *info = rdev_get_drvdata(rdev);
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unsigned int data;
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int ret, mode = 0;
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ret = regmap_read(rdev->regmap, info->conf, &data);
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if (ret < 0)
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return ret;
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switch (data & PV88090_BUCK1_MODE_MASK) {
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case PV88090_BUCK_MODE_SYNC:
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mode = REGULATOR_MODE_FAST;
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break;
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case PV88090_BUCK_MODE_AUTO:
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mode = REGULATOR_MODE_NORMAL;
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break;
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case PV88090_BUCK_MODE_SLEEP:
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mode = REGULATOR_MODE_STANDBY;
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break;
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}
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return mode;
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}
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static int pv88090_buck_set_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct pv88090_regulator *info = rdev_get_drvdata(rdev);
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int val = 0;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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val = PV88090_BUCK_MODE_SYNC;
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break;
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case REGULATOR_MODE_NORMAL:
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val = PV88090_BUCK_MODE_AUTO;
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break;
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case REGULATOR_MODE_STANDBY:
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val = PV88090_BUCK_MODE_SLEEP;
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break;
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default:
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return -EINVAL;
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}
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return regmap_update_bits(rdev->regmap, info->conf,
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PV88090_BUCK1_MODE_MASK, val);
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}
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static const struct regulator_ops pv88090_buck_ops = {
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.get_mode = pv88090_buck_get_mode,
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.set_mode = pv88090_buck_set_mode,
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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_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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.set_current_limit = regulator_set_current_limit_regmap,
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.get_current_limit = regulator_get_current_limit_regmap,
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};
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static const struct regulator_ops pv88090_ldo_ops = {
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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_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
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{\
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.desc = {\
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.id = chip##_ID_##regl_name,\
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.name = __stringify(chip##_##regl_name),\
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.of_match = of_match_ptr(#regl_name),\
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.regulators_node = of_match_ptr("regulators"),\
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.type = REGULATOR_VOLTAGE,\
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.owner = THIS_MODULE,\
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.ops = &pv88090_buck_ops,\
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.min_uV = min, \
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.uV_step = step, \
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.n_voltages = ((max) - (min))/(step) + 1, \
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.enable_reg = PV88090_REG_##regl_name##_CONF0, \
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.enable_mask = PV88090_##regl_name##_EN, \
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.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
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.vsel_mask = PV88090_V##regl_name##_MASK, \
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.curr_table = limits_array, \
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.n_current_limits = ARRAY_SIZE(limits_array), \
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.csel_reg = PV88090_REG_##regl_name##_CONF1, \
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.csel_mask = PV88090_##regl_name##_ILIM_MASK, \
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},\
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.conf = PV88090_REG_##regl_name##_CONF1, \
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.conf2 = PV88090_REG_##regl_name##_CONF2, \
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}
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#define PV88090_LDO(chip, regl_name, min, step, max) \
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{\
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.desc = {\
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.id = chip##_ID_##regl_name,\
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.name = __stringify(chip##_##regl_name),\
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.of_match = of_match_ptr(#regl_name),\
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.regulators_node = of_match_ptr("regulators"),\
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.type = REGULATOR_VOLTAGE,\
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.owner = THIS_MODULE,\
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.ops = &pv88090_ldo_ops,\
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.min_uV = min, \
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.uV_step = step, \
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.n_voltages = ((max) - (min))/(step) + 1, \
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.enable_reg = PV88090_REG_##regl_name##_CONT, \
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.enable_mask = PV88090_##regl_name##_EN, \
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.vsel_reg = PV88090_REG_##regl_name##_CONT, \
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.vsel_mask = PV88090_V##regl_name##_MASK, \
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},\
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}
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static struct pv88090_regulator pv88090_regulator_info[] = {
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PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
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pv88090_buck1_limits),
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PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
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pv88090_buck23_limits),
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PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
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pv88090_buck23_limits),
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PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
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PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
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};
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static irqreturn_t pv88090_irq_handler(int irq, void *data)
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{
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struct pv88090 *chip = data;
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int i, reg_val, err, ret = IRQ_NONE;
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err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, ®_val);
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if (err < 0)
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goto error_i2c;
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if (reg_val & PV88090_E_VDD_FLT) {
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for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
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if (chip->rdev[i] != NULL) {
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regulator_lock(chip->rdev[i]);
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regulator_notifier_call_chain(chip->rdev[i],
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REGULATOR_EVENT_UNDER_VOLTAGE,
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NULL);
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regulator_unlock(chip->rdev[i]);
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}
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}
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err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
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PV88090_E_VDD_FLT);
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if (err < 0)
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goto error_i2c;
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ret = IRQ_HANDLED;
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}
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if (reg_val & PV88090_E_OVER_TEMP) {
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for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
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if (chip->rdev[i] != NULL) {
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regulator_lock(chip->rdev[i]);
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regulator_notifier_call_chain(chip->rdev[i],
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REGULATOR_EVENT_OVER_TEMP,
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NULL);
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regulator_unlock(chip->rdev[i]);
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}
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}
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err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
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PV88090_E_OVER_TEMP);
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if (err < 0)
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goto error_i2c;
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ret = IRQ_HANDLED;
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}
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return ret;
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error_i2c:
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dev_err(chip->dev, "I2C error : %d\n", err);
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return IRQ_NONE;
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}
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/*
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* I2C driver interface functions
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*/
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static int pv88090_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
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struct pv88090 *chip;
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struct regulator_config config = { };
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int error, i, ret = 0;
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unsigned int conf2, range, index;
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chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->dev = &i2c->dev;
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chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
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if (IS_ERR(chip->regmap)) {
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error = PTR_ERR(chip->regmap);
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dev_err(chip->dev, "Failed to allocate register map: %d\n",
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error);
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return error;
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}
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i2c_set_clientdata(i2c, chip);
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if (i2c->irq != 0) {
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ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
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if (ret < 0) {
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dev_err(chip->dev,
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"Failed to mask A reg: %d\n", ret);
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return ret;
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}
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ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
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if (ret < 0) {
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dev_err(chip->dev,
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"Failed to mask B reg: %d\n", ret);
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return ret;
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}
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ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
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pv88090_irq_handler,
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IRQF_TRIGGER_LOW|IRQF_ONESHOT,
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"pv88090", chip);
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if (ret != 0) {
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dev_err(chip->dev, "Failed to request IRQ: %d\n",
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i2c->irq);
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return ret;
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}
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ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
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PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
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if (ret < 0) {
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dev_err(chip->dev,
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"Failed to update mask reg: %d\n", ret);
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return ret;
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}
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} else {
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dev_warn(chip->dev, "No IRQ configured\n");
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}
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config.dev = chip->dev;
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config.regmap = chip->regmap;
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for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
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if (init_data)
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config.init_data = &init_data[i];
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if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
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ret = regmap_read(chip->regmap,
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pv88090_regulator_info[i].conf2, &conf2);
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if (ret < 0)
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return ret;
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conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
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PV88090_BUCK_VDAC_RANGE_MASK;
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ret = regmap_read(chip->regmap,
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PV88090_REG_BUCK_FOLD_RANGE, &range);
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if (ret < 0)
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return ret;
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range = (range >>
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(PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
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PV88090_BUCK_VRANGE_GAIN_MASK;
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index = ((range << 1) | conf2);
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if (index > PV88090_ID_BUCK3) {
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dev_err(chip->dev,
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"Invalid index(%d)\n", index);
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return -EINVAL;
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}
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pv88090_regulator_info[i].desc.min_uV
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= pv88090_buck_vol[index].min_uV;
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pv88090_regulator_info[i].desc.uV_step
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= pv88090_buck_vol[index].uV_step;
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pv88090_regulator_info[i].desc.n_voltages
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= ((pv88090_buck_vol[index].max_uV)
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- (pv88090_buck_vol[index].min_uV))
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/(pv88090_buck_vol[index].uV_step) + 1;
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}
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config.driver_data = (void *)&pv88090_regulator_info[i];
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chip->rdev[i] = devm_regulator_register(chip->dev,
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&pv88090_regulator_info[i].desc, &config);
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if (IS_ERR(chip->rdev[i])) {
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dev_err(chip->dev,
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"Failed to register PV88090 regulator\n");
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return PTR_ERR(chip->rdev[i]);
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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 i2c_device_id pv88090_i2c_id[] = {
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{"pv88090", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
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#ifdef CONFIG_OF
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static const struct of_device_id pv88090_dt_ids[] = {
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{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
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{},
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};
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MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
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#endif
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static struct i2c_driver pv88090_regulator_driver = {
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.driver = {
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.name = "pv88090",
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.of_match_table = of_match_ptr(pv88090_dt_ids),
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},
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.probe = pv88090_i2c_probe,
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.id_table = pv88090_i2c_id,
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};
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module_i2c_driver(pv88090_regulator_driver);
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MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
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MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
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MODULE_LICENSE("GPL");
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