498 lines
13 KiB
C
498 lines
13 KiB
C
/*
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* Copyright (C) 2014 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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/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_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_regulator {
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struct regulator_desc desc;
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struct device_node *np;
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/* External feedback voltage divider */
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unsigned int r1;
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unsigned int r2;
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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 ltc3676_regulator 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, bit = 0;
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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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/* DVB reference select is bit5 of DVBA reg */
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mask = 1 << 5;
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if (mode != REGULATOR_MODE_STANDBY)
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bit = mask; /* Select DVBB */
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return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
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mask, bit);
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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 struct regulator_ops ltc3676_linear_regulator_ops =
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{
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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 = regulator_set_voltage_sel_regmap,
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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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/* always on fixed regulators */
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static struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
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};
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#define LTC3676_REG(_name, _ops, en_reg, en_bit, dvba_reg, dvb_mask) \
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[LTC3676_ ## _name] = { \
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.desc = { \
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.name = #_name, \
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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_ ## _name, \
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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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}
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#define LTC3676_LINEAR_REG(_name, _en, _dvba) \
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LTC3676_REG(_name, linear, \
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LTC3676_ ## _en, 7, \
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LTC3676_ ## _dvba, 0x1f)
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#define LTC3676_FIXED_REG(_name) \
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LTC3676_REG(_name, fixed_standby, 0, 0, 0, 0)
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static struct ltc3676_regulator ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
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LTC3676_LINEAR_REG(SW1, BUCK1, DVB1A),
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LTC3676_LINEAR_REG(SW2, BUCK2, DVB2A),
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LTC3676_LINEAR_REG(SW3, BUCK3, DVB3A),
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LTC3676_LINEAR_REG(SW4, BUCK4, DVB4A),
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LTC3676_FIXED_REG(LDO1),
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LTC3676_FIXED_REG(LDO2),
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LTC3676_FIXED_REG(LDO3),
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LTC3676_FIXED_REG(LDO4),
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};
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#ifdef CONFIG_OF
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static struct of_regulator_match ltc3676_matches[] = {
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{ .name = "sw1", },
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{ .name = "sw2", },
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{ .name = "sw3", },
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{ .name = "sw4", },
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{ .name = "ldo1", },
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{ .name = "ldo2", },
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{ .name = "ldo3", },
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{ .name = "ldo4", },
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};
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static int ltc3676_parse_regulators_dt(struct ltc3676 *ltc3676)
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{
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struct device *dev = ltc3676->dev;
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struct device_node *node;
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int i, ret;
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node = of_find_node_by_name(dev->of_node, "regulators");
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if (!node) {
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dev_err(dev, "regulators node not found\n");
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return -EINVAL;
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}
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ret = of_regulator_match(dev, node, ltc3676_matches,
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ARRAY_SIZE(ltc3676_matches));
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of_node_put(node);
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if (ret < 0) {
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dev_err(dev, "Error parsing regulator init data: %d\n", ret);
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return -EINVAL;
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}
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/* parse feedback voltage deviders: LDO3 doesn't have them */
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for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
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struct ltc3676_regulator *rdesc = <c3676->regulator_descs[i];
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struct device_node *np = ltc3676_matches[i].of_node;
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u32 vdiv[2];
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rdesc->np = ltc3676_matches[i].of_node;
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if (i == LTC3676_LDO3 || !rdesc->np)
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continue;
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ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider",
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vdiv, 2);
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if (ret) {
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dev_err(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->r1 = vdiv[0];
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rdesc->r2 = vdiv[1];
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}
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return 0;
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}
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static inline struct regulator_init_data *match_init_data(int index)
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{
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return ltc3676_matches[index].init_data;
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}
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static inline struct device_node *match_of_node(int index)
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{
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return ltc3676_matches[index].of_node;
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}
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#else
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static int ltc3676_parse_regulators_dt(struct ltc3676_chip *chip)
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{
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return 0;
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}
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static inline struct regulator_init_data *match_init_data(int index)
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{
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return NULL;
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}
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static inline struct device_node *match_of_node(int index)
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{
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return NULL;
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}
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#endif
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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_info(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 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 void ltc3676_apply_fb_voltage_divider(struct ltc3676_regulator *rdesc)
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{
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struct regulator_desc *desc = &rdesc->desc;
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if (!rdesc->r1 || !rdesc->r2)
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return;
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desc->min_uV = ltc3676_scale(desc->min_uV, rdesc->r1, rdesc->r2);
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desc->uV_step = ltc3676_scale(desc->uV_step, rdesc->r1, rdesc->r2);
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desc->fixed_uV = ltc3676_scale(desc->fixed_uV, rdesc->r1, rdesc->r2);
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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 ltc3676_regulator *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].desc.fixed_uV = 1800000;
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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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ret = ltc3676_parse_regulators_dt(ltc3676);
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if (ret)
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return ret;
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for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
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struct ltc3676_regulator *rdesc = <c3676->regulator_descs[i];
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struct regulator_desc *desc = &rdesc->desc;
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struct regulator_init_data *init_data;
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struct regulator_config config = { };
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init_data = match_init_data(i);
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if (!rdesc->np)
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continue;
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if (i != LTC3676_LDO3) {
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/* skip unused (defined by r1=r2=0) */
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if (rdesc->r1 == 0 && rdesc->r2 == 0)
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continue;
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ltc3676_apply_fb_voltage_divider(rdesc);
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}
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config.dev = dev;
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config.init_data = init_data;
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config.driver_data = ltc3676;
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config.of_node = match_of_node(i);
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ltc3676->regulators[i] = regulator_register(desc, &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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ret = devm_request_threaded_irq(dev, client->irq, NULL, ltc3676_isr,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
client->name, ltc3676);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to request IRQ: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ltc3676_i2c_id[] = {
|
|
{ "ltc3676" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);
|
|
|
|
static struct i2c_driver ltc3676_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ltc3676_regulator_probe,
|
|
.id_table = ltc3676_i2c_id,
|
|
};
|
|
module_i2c_driver(ltc3676_driver);
|
|
|
|
MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
|
|
MODULE_DESCRIPTION("Regulator Driver for Linear Technology LTC1376");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("i2c:ltc3676");
|