446 lines
12 KiB
C
446 lines
12 KiB
C
/*
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* Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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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*/
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/regmap.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/regulator/of_regulator.h>
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#define DRIVER_NAME "ltc3676"
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/* LTC3676 Registers */
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#define LTC3676_BUCK1 0x01
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#define LTC3676_BUCK2 0x02
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#define LTC3676_BUCK3 0x03
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#define LTC3676_BUCK4 0x04
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#define LTC3676_LDOA 0x05
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#define LTC3676_LDOB 0x06
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#define LTC3676_SQD1 0x07
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#define LTC3676_SQD2 0x08
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#define LTC3676_CNTRL 0x09
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#define LTC3676_DVB1A 0x0A
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#define LTC3676_DVB1B 0x0B
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#define LTC3676_DVB2A 0x0C
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#define LTC3676_DVB2B 0x0D
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#define LTC3676_DVB3A 0x0E
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#define LTC3676_DVB3B 0x0F
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#define LTC3676_DVB4A 0x10
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#define LTC3676_DVB4B 0x11
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#define LTC3676_MSKIRQ 0x12
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#define LTC3676_MSKPG 0x13
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#define LTC3676_USER 0x14
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#define LTC3676_IRQSTAT 0x15
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#define LTC3676_PGSTATL 0x16
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#define LTC3676_PGSTATRT 0x17
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#define LTC3676_HRST 0x1E
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#define LTC3676_CLIRQ 0x1F
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#define LTC3676_DVBxA_REF_SELECT BIT(5)
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#define LTC3676_DVBxB_PGOOD_MASK BIT(5)
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#define LTC3676_IRQSTAT_PGOOD_TIMEOUT BIT(3)
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#define LTC3676_IRQSTAT_UNDERVOLT_WARN BIT(4)
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#define LTC3676_IRQSTAT_UNDERVOLT_FAULT BIT(5)
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#define LTC3676_IRQSTAT_THERMAL_WARN BIT(6)
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#define LTC3676_IRQSTAT_THERMAL_FAULT BIT(7)
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enum ltc3676_reg {
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LTC3676_SW1,
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LTC3676_SW2,
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LTC3676_SW3,
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LTC3676_SW4,
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LTC3676_LDO1,
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LTC3676_LDO2,
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LTC3676_LDO3,
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LTC3676_LDO4,
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LTC3676_NUM_REGULATORS,
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};
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struct ltc3676 {
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struct regmap *regmap;
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struct device *dev;
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struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
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struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
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};
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static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
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{
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struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
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struct device *dev = ltc3676->dev;
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int dcdc = rdev_get_id(rdev);
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int sel;
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dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
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sel = regulator_map_voltage_linear(rdev, uV, uV);
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if (sel < 0)
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return sel;
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/* DVBB register follows right after the corresponding DVBA register */
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return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
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rdev->desc->vsel_mask, sel);
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}
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static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
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struct device *dev = ltc3676->dev;
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int mask, val;
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int dcdc = rdev_get_id(rdev);
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dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);
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mask = LTC3676_DVBxA_REF_SELECT;
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switch (mode) {
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case REGULATOR_MODE_STANDBY:
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val = 0; /* select DVBxA */
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break;
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case REGULATOR_MODE_NORMAL:
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val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
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break;
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default:
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dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
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rdev->desc->name, mode);
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return -EINVAL;
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}
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return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
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mask, val);
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}
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static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
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{
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struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
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struct device *dev = ltc3676->dev;
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int ret, dcdc = rdev_get_id(rdev);
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dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);
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ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
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LTC3676_DVBxB_PGOOD_MASK,
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LTC3676_DVBxB_PGOOD_MASK);
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if (ret)
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return ret;
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return regulator_set_voltage_sel_regmap(rdev, selector);
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}
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static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
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{
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uint64_t tmp;
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if (uV == 0)
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return 0;
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tmp = (uint64_t)uV * r1;
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do_div(tmp, r2);
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return uV + (unsigned int)tmp;
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}
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static int ltc3676_of_parse_cb(struct device_node *np,
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const struct regulator_desc *desc,
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struct regulator_config *config)
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{
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struct ltc3676 *ltc3676 = config->driver_data;
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struct regulator_desc *rdesc = <c3676->regulator_descs[desc->id];
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u32 r[2];
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int ret;
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/* LDO3 has a fixed output */
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if (desc->id == LTC3676_LDO3)
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return 0;
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ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
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if (ret) {
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dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n",
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ret);
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return ret;
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}
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rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]);
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rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]);
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rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]);
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return 0;
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}
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/* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */
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static const struct regulator_ops ltc3676_linear_regulator_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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.list_voltage = regulator_list_voltage_linear,
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.set_voltage_sel = ltc3676_set_voltage_sel,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_suspend_voltage = ltc3676_set_suspend_voltage,
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.set_suspend_mode = ltc3676_set_suspend_mode,
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};
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/* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */
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static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
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};
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/* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */
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static const struct regulator_ops ltc3676_fixed_regulator_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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};
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#define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask) \
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[LTC3676_ ## _id] = { \
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.name = #_name, \
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.of_match = of_match_ptr(#_name), \
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.regulators_node = of_match_ptr("regulators"), \
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.of_parse_cb = ltc3676_of_parse_cb, \
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.n_voltages = (dvb_mask) + 1, \
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.min_uV = (dvba_reg) ? 412500 : 0, \
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.uV_step = (dvba_reg) ? 12500 : 0, \
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.ramp_delay = (dvba_reg) ? 800 : 0, \
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.fixed_uV = (dvb_mask) ? 0 : 725000, \
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.ops = <c3676_ ## _ops ## _regulator_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = LTC3676_ ## _id, \
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.owner = THIS_MODULE, \
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.vsel_reg = (dvba_reg), \
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.vsel_mask = (dvb_mask), \
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.enable_reg = (en_reg), \
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.enable_mask = (1 << en_bit), \
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}
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#define LTC3676_LINEAR_REG(_id, _name, _en, _dvba) \
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LTC3676_REG(_id, _name, linear, \
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LTC3676_ ## _en, 7, \
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LTC3676_ ## _dvba, 0x1f)
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#define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit) \
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LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0)
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static struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
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LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A),
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LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A),
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LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A),
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LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A),
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LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
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LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2),
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LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5),
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LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2),
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};
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static bool ltc3676_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3676_IRQSTAT:
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case LTC3676_BUCK1:
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case LTC3676_BUCK2:
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case LTC3676_BUCK3:
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case LTC3676_BUCK4:
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case LTC3676_LDOA:
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case LTC3676_LDOB:
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case LTC3676_SQD1:
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case LTC3676_SQD2:
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case LTC3676_CNTRL:
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case LTC3676_DVB1A:
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case LTC3676_DVB1B:
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case LTC3676_DVB2A:
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case LTC3676_DVB2B:
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case LTC3676_DVB3A:
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case LTC3676_DVB3B:
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case LTC3676_DVB4A:
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case LTC3676_DVB4B:
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case LTC3676_MSKIRQ:
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case LTC3676_MSKPG:
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case LTC3676_USER:
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case LTC3676_HRST:
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case LTC3676_CLIRQ:
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return true;
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}
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return false;
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}
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static bool ltc3676_readable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3676_IRQSTAT:
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case LTC3676_BUCK1:
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case LTC3676_BUCK2:
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case LTC3676_BUCK3:
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case LTC3676_BUCK4:
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case LTC3676_LDOA:
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case LTC3676_LDOB:
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case LTC3676_SQD1:
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case LTC3676_SQD2:
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case LTC3676_CNTRL:
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case LTC3676_DVB1A:
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case LTC3676_DVB1B:
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case LTC3676_DVB2A:
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case LTC3676_DVB2B:
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case LTC3676_DVB3A:
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case LTC3676_DVB3B:
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case LTC3676_DVB4A:
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case LTC3676_DVB4B:
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case LTC3676_MSKIRQ:
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case LTC3676_MSKPG:
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case LTC3676_USER:
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case LTC3676_HRST:
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case LTC3676_CLIRQ:
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return true;
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}
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return false;
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}
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static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3676_IRQSTAT:
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case LTC3676_PGSTATL:
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case LTC3676_PGSTATRT:
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return true;
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}
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return false;
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}
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static const struct regmap_config ltc3676_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.writeable_reg = ltc3676_writeable_reg,
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.readable_reg = ltc3676_readable_reg,
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.volatile_reg = ltc3676_volatile_reg,
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.max_register = LTC3676_CLIRQ,
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.use_single_rw = true,
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.cache_type = REGCACHE_RBTREE,
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};
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static irqreturn_t ltc3676_isr(int irq, void *dev_id)
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{
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struct ltc3676 *ltc3676 = dev_id;
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struct device *dev = ltc3676->dev;
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unsigned int i, irqstat, event;
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regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat);
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dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat);
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if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
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dev_warn(dev, "Over-temperature Warning\n");
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event = REGULATOR_EVENT_OVER_TEMP;
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for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
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regulator_notifier_call_chain(ltc3676->regulators[i],
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event, NULL);
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}
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if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
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dev_info(dev, "Undervoltage Warning\n");
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event = REGULATOR_EVENT_UNDER_VOLTAGE;
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for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
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regulator_notifier_call_chain(ltc3676->regulators[i],
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event, NULL);
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}
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/* Clear warning condition */
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regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
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return IRQ_HANDLED;
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}
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static int ltc3676_regulator_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct regulator_init_data *init_data = dev_get_platdata(dev);
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struct regulator_desc *descs;
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struct ltc3676 *ltc3676;
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int i, ret;
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ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL);
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if (!ltc3676)
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return -ENOMEM;
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i2c_set_clientdata(client, ltc3676);
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ltc3676->dev = dev;
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descs = ltc3676->regulator_descs;
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memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators));
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descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */
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ltc3676->regmap = devm_regmap_init_i2c(client, <c3676_regmap_config);
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if (IS_ERR(ltc3676->regmap)) {
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ret = PTR_ERR(ltc3676->regmap);
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dev_err(dev, "failed to initialize regmap: %d\n", ret);
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return ret;
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}
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for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
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struct regulator_desc *desc = <c3676->regulator_descs[i];
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struct regulator_config config = { };
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if (init_data)
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config.init_data = &init_data[i];
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config.dev = dev;
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config.driver_data = ltc3676;
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ltc3676->regulators[i] = devm_regulator_register(dev, desc,
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&config);
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if (IS_ERR(ltc3676->regulators[i])) {
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ret = PTR_ERR(ltc3676->regulators[i]);
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dev_err(dev, "failed to register regulator %s: %d\n",
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desc->name, ret);
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return ret;
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}
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}
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regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
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if (client->irq) {
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ret = devm_request_threaded_irq(dev, client->irq, NULL,
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ltc3676_isr,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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client->name, ltc3676);
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if (ret) {
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dev_err(dev, "Failed to request IRQ: %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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static const struct i2c_device_id ltc3676_i2c_id[] = {
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{ "ltc3676" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);
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static const struct of_device_id ltc3676_of_match[] = {
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{ .compatible = "lltc,ltc3676" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ltc3676_of_match);
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static struct i2c_driver ltc3676_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = of_match_ptr(ltc3676_of_match),
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},
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.probe = ltc3676_regulator_probe,
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.id_table = ltc3676_i2c_id,
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};
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module_i2c_driver(ltc3676_driver);
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MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
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MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC1376");
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MODULE_LICENSE("GPL v2");
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