420 lines
10 KiB
C
420 lines
10 KiB
C
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/*
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* pv88080-regulator.c - Regulator device driver for PV88080
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* Copyright (C) 2016 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/gpio.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 <linux/proc_fs.h>
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#include <linux/uaccess.h>
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#include "pv88080-regulator.h"
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#define PV88080_MAX_REGULATORS 3
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/* PV88080 REGULATOR IDs */
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enum {
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/* BUCKs */
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PV88080_ID_BUCK1,
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PV88080_ID_BUCK2,
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PV88080_ID_BUCK3,
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};
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struct pv88080_regulator {
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struct regulator_desc desc;
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/* Current limiting */
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unsigned int n_current_limits;
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const int *current_limits;
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unsigned int limit_mask;
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unsigned int conf;
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unsigned int conf2;
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unsigned int conf5;
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};
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struct pv88080 {
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struct device *dev;
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struct regmap *regmap;
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struct regulator_dev *rdev[PV88080_MAX_REGULATORS];
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};
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struct pv88080_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 pv88080_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 int pv88080_buck1_limits[] = {
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3230000, 5130000, 6960000, 8790000
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};
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static const int pv88080_buck23_limits[] = {
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1496000, 2393000, 3291000, 4189000
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};
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static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {
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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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static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)
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{
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struct pv88080_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 & PV88080_BUCK1_MODE_MASK) {
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case PV88080_BUCK_MODE_SYNC:
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mode = REGULATOR_MODE_FAST;
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break;
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case PV88080_BUCK_MODE_AUTO:
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mode = REGULATOR_MODE_NORMAL;
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break;
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case PV88080_BUCK_MODE_SLEEP:
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mode = REGULATOR_MODE_STANDBY;
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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 mode;
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}
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static int pv88080_buck_set_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct pv88080_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 = PV88080_BUCK_MODE_SYNC;
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break;
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case REGULATOR_MODE_NORMAL:
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val = PV88080_BUCK_MODE_AUTO;
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break;
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case REGULATOR_MODE_STANDBY:
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val = PV88080_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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PV88080_BUCK1_MODE_MASK, val);
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}
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static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,
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int max)
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{
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struct pv88080_regulator *info = rdev_get_drvdata(rdev);
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int i;
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/* search for closest to maximum */
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for (i = info->n_current_limits; i >= 0; i--) {
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if (min <= info->current_limits[i]
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&& max >= info->current_limits[i]) {
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return regmap_update_bits(rdev->regmap,
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info->conf,
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info->limit_mask,
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i << PV88080_BUCK1_ILIM_SHIFT);
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}
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}
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return -EINVAL;
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}
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static int pv88080_get_current_limit(struct regulator_dev *rdev)
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{
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struct pv88080_regulator *info = rdev_get_drvdata(rdev);
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unsigned int data;
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int ret;
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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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data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;
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return info->current_limits[data];
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}
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static struct regulator_ops pv88080_buck_ops = {
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.get_mode = pv88080_buck_get_mode,
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.set_mode = pv88080_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 = pv88080_set_current_limit,
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.get_current_limit = pv88080_get_current_limit,
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};
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#define PV88080_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 = &pv88080_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 = PV88080_REG_##regl_name##_CONF0, \
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.enable_mask = PV88080_##regl_name##_EN, \
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.vsel_reg = PV88080_REG_##regl_name##_CONF0, \
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.vsel_mask = PV88080_V##regl_name##_MASK, \
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},\
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.current_limits = limits_array, \
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.n_current_limits = ARRAY_SIZE(limits_array), \
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.limit_mask = PV88080_##regl_name##_ILIM_MASK, \
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.conf = PV88080_REG_##regl_name##_CONF1, \
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.conf2 = PV88080_REG_##regl_name##_CONF2, \
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.conf5 = PV88080_REG_##regl_name##_CONF5, \
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}
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static struct pv88080_regulator pv88080_regulator_info[] = {
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PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,
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pv88080_buck1_limits),
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PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,
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pv88080_buck23_limits),
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PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,
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pv88080_buck23_limits),
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};
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static irqreturn_t pv88080_irq_handler(int irq, void *data)
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{
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struct pv88080 *chip = data;
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int i, reg_val, err, ret = IRQ_NONE;
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err = regmap_read(chip->regmap, PV88080_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 & PV88080_E_VDD_FLT) {
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for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
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if (chip->rdev[i] != NULL) {
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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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}
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}
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err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
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PV88080_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 & PV88080_E_OVER_TEMP) {
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for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
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if (chip->rdev[i] != NULL) {
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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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}
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}
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err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
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PV88080_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 pv88080_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 pv88080 *chip;
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struct regulator_config config = { };
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int i, error, ret;
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unsigned int conf2, conf5;
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chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), 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, &pv88080_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, PV88080_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, PV88080_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 = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);
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if (ret < 0) {
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dev_err(chip->dev,
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"Failed to mask C 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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pv88080_irq_handler,
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IRQF_TRIGGER_LOW|IRQF_ONESHOT,
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"pv88080", 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, PV88080_REG_MASK_A,
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PV88080_M_VDD_FLT | PV88080_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 < PV88080_MAX_REGULATORS; i++) {
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if (init_data)
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config.init_data = &init_data[i];
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ret = regmap_read(chip->regmap,
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pv88080_regulator_info[i].conf2, &conf2);
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if (ret < 0)
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return ret;
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conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &
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PV88080_BUCK_VDAC_RANGE_MASK);
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ret = regmap_read(chip->regmap,
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pv88080_regulator_info[i].conf5, &conf5);
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if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &
|
||
|
|
PV88080_BUCK_VRANGE_GAIN_MASK);
|
||
|
|
|
||
|
|
pv88080_regulator_info[i].desc.min_uV =
|
||
|
|
pv88080_buck_vol[conf2].min_uV * (conf5+1);
|
||
|
|
pv88080_regulator_info[i].desc.uV_step =
|
||
|
|
pv88080_buck_vol[conf2].uV_step * (conf5+1);
|
||
|
|
pv88080_regulator_info[i].desc.n_voltages =
|
||
|
|
((pv88080_buck_vol[conf2].max_uV * (conf5+1))
|
||
|
|
- (pv88080_regulator_info[i].desc.min_uV))
|
||
|
|
/(pv88080_regulator_info[i].desc.uV_step) + 1;
|
||
|
|
|
||
|
|
config.driver_data = (void *)&pv88080_regulator_info[i];
|
||
|
|
chip->rdev[i] = devm_regulator_register(chip->dev,
|
||
|
|
&pv88080_regulator_info[i].desc, &config);
|
||
|
|
if (IS_ERR(chip->rdev[i])) {
|
||
|
|
dev_err(chip->dev,
|
||
|
|
"Failed to register PV88080 regulator\n");
|
||
|
|
return PTR_ERR(chip->rdev[i]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id pv88080_i2c_id[] = {
|
||
|
|
{"pv88080", 0},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
static const struct of_device_id pv88080_dt_ids[] = {
|
||
|
|
{ .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, pv88080_dt_ids);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static struct i2c_driver pv88080_regulator_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "pv88080",
|
||
|
|
.of_match_table = of_match_ptr(pv88080_dt_ids),
|
||
|
|
},
|
||
|
|
.probe = pv88080_i2c_probe,
|
||
|
|
.id_table = pv88080_i2c_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(pv88080_regulator_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
|
||
|
|
MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");
|
||
|
|
MODULE_LICENSE("GPL");
|