554 lines
14 KiB
C
554 lines
14 KiB
C
/*
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* Linear Technology LTC3589,LTC3589-1 regulator support
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*
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* Copyright (c) 2014 Philipp Zabel <p.zabel@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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/of_regulator.h>
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#define DRIVER_NAME "ltc3589"
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#define LTC3589_IRQSTAT 0x02
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#define LTC3589_SCR1 0x07
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#define LTC3589_OVEN 0x10
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#define LTC3589_SCR2 0x12
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#define LTC3589_PGSTAT 0x13
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#define LTC3589_VCCR 0x20
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#define LTC3589_CLIRQ 0x21
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#define LTC3589_B1DTV1 0x23
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#define LTC3589_B1DTV2 0x24
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#define LTC3589_VRRCR 0x25
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#define LTC3589_B2DTV1 0x26
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#define LTC3589_B2DTV2 0x27
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#define LTC3589_B3DTV1 0x29
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#define LTC3589_B3DTV2 0x2a
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#define LTC3589_L2DTV1 0x32
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#define LTC3589_L2DTV2 0x33
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#define LTC3589_IRQSTAT_PGOOD_TIMEOUT BIT(3)
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#define LTC3589_IRQSTAT_UNDERVOLT_WARN BIT(4)
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#define LTC3589_IRQSTAT_UNDERVOLT_FAULT BIT(5)
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#define LTC3589_IRQSTAT_THERMAL_WARN BIT(6)
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#define LTC3589_IRQSTAT_THERMAL_FAULT BIT(7)
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#define LTC3589_OVEN_SW1 BIT(0)
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#define LTC3589_OVEN_SW2 BIT(1)
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#define LTC3589_OVEN_SW3 BIT(2)
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#define LTC3589_OVEN_BB_OUT BIT(3)
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#define LTC3589_OVEN_LDO2 BIT(4)
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#define LTC3589_OVEN_LDO3 BIT(5)
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#define LTC3589_OVEN_LDO4 BIT(6)
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#define LTC3589_OVEN_SW_CTRL BIT(7)
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#define LTC3589_VCCR_SW1_GO BIT(0)
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#define LTC3589_VCCR_SW2_GO BIT(2)
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#define LTC3589_VCCR_SW3_GO BIT(4)
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#define LTC3589_VCCR_LDO2_GO BIT(6)
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enum ltc3589_variant {
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LTC3589,
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LTC3589_1,
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LTC3589_2,
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};
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enum ltc3589_reg {
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LTC3589_SW1,
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LTC3589_SW2,
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LTC3589_SW3,
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LTC3589_BB_OUT,
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LTC3589_LDO1,
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LTC3589_LDO2,
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LTC3589_LDO3,
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LTC3589_LDO4,
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LTC3589_NUM_REGULATORS,
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};
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struct ltc3589_regulator {
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struct regulator_desc desc;
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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 ltc3589 {
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struct regmap *regmap;
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struct device *dev;
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enum ltc3589_variant variant;
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struct ltc3589_regulator regulator_descs[LTC3589_NUM_REGULATORS];
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struct regulator_dev *regulators[LTC3589_NUM_REGULATORS];
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};
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static const int ltc3589_ldo4[] = {
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2800000, 2500000, 1800000, 3300000,
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};
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static const int ltc3589_12_ldo4[] = {
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1200000, 1800000, 2500000, 3200000,
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};
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static int ltc3589_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
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{
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struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
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int sel, shift;
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if (unlikely(ramp_delay <= 0))
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return -EINVAL;
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/* VRRCR slew rate offsets are the same as VCCR go bit offsets */
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shift = ffs(rdev->desc->apply_bit) - 1;
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/* The slew rate can be set to 0.88, 1.75, 3.5, or 7 mV/uS */
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for (sel = 0; sel < 4; sel++) {
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if ((880 << sel) >= ramp_delay) {
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return regmap_update_bits(ltc3589->regmap,
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LTC3589_VRRCR,
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0x3 << shift, sel << 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 ltc3589_set_suspend_voltage(struct regulator_dev *rdev, int uV)
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{
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struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
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int sel;
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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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/* DTV2 register follows right after the corresponding DTV1 register */
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return regmap_update_bits(ltc3589->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 ltc3589_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
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int mask, bit = 0;
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/* VCCR reference selects are right next to the VCCR go bits */
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mask = rdev->desc->apply_bit << 1;
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if (mode == REGULATOR_MODE_STANDBY)
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bit = mask; /* Select DTV2 */
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mask |= rdev->desc->apply_bit;
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bit |= rdev->desc->apply_bit;
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return regmap_update_bits(ltc3589->regmap, LTC3589_VCCR, mask, bit);
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}
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/* SW1, SW2, SW3, LDO2 */
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static struct regulator_ops ltc3589_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 = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_ramp_delay = ltc3589_set_ramp_delay,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_suspend_voltage = ltc3589_set_suspend_voltage,
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.set_suspend_mode = ltc3589_set_suspend_mode,
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};
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/* BB_OUT, LDO3 */
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static struct regulator_ops ltc3589_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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/* LDO1 */
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static struct regulator_ops ltc3589_fixed_standby_regulator_ops = {
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};
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/* LDO4 */
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static struct regulator_ops ltc3589_table_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_table,
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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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};
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#define LTC3589_REG(_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit) \
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[LTC3589_ ## _name] = { \
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.desc = { \
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.name = #_name, \
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.n_voltages = (dtv_mask) + 1, \
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.min_uV = (go_bit) ? 362500 : 0, \
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.uV_step = (go_bit) ? 12500 : 0, \
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.ramp_delay = (go_bit) ? 1750 : 0, \
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.fixed_uV = (dtv_mask) ? 0 : 800000, \
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.ops = <c3589_ ## _ops ## _regulator_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = LTC3589_ ## _name, \
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.owner = THIS_MODULE, \
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.vsel_reg = (dtv1_reg), \
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.vsel_mask = (dtv_mask), \
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.apply_reg = (go_bit) ? LTC3589_VCCR : 0, \
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.apply_bit = (go_bit), \
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.enable_reg = (en_bit) ? LTC3589_OVEN : 0, \
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.enable_mask = (en_bit), \
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}, \
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}
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#define LTC3589_LINEAR_REG(_name, _dtv1) \
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LTC3589_REG(_name, linear, LTC3589_OVEN_ ## _name, \
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LTC3589_ ## _dtv1, 0x1f, \
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LTC3589_VCCR_ ## _name ## _GO)
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#define LTC3589_FIXED_REG(_name) \
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LTC3589_REG(_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)
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static struct ltc3589_regulator ltc3589_regulators[LTC3589_NUM_REGULATORS] = {
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LTC3589_LINEAR_REG(SW1, B1DTV1),
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LTC3589_LINEAR_REG(SW2, B2DTV1),
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LTC3589_LINEAR_REG(SW3, B3DTV1),
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LTC3589_FIXED_REG(BB_OUT),
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LTC3589_REG(LDO1, fixed_standby, 0, 0, 0, 0),
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LTC3589_LINEAR_REG(LDO2, L2DTV1),
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LTC3589_FIXED_REG(LDO3),
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LTC3589_REG(LDO4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2, 0x60, 0),
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};
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#ifdef CONFIG_OF
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static struct of_regulator_match ltc3589_matches[LTC3589_NUM_REGULATORS] = {
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{ .name = "sw1", },
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{ .name = "sw2", },
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{ .name = "sw3", },
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{ .name = "bb-out", },
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{ .name = "ldo1", }, /* standby */
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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 ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
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{
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struct device *dev = ltc3589->dev;
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struct device_node *node;
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int i, ret;
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node = of_get_child_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, ltc3589_matches,
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ARRAY_SIZE(ltc3589_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 ret;
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}
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if (ret != LTC3589_NUM_REGULATORS) {
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dev_err(dev, "Only %d regulators described in device tree\n",
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ret);
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return -EINVAL;
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}
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/* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
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for (i = 0; i < LTC3589_LDO3; i++) {
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struct ltc3589_regulator *desc = <c3589->regulator_descs[i];
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struct device_node *np = ltc3589_matches[i].of_node;
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u32 vdiv[2];
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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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desc->r1 = vdiv[0];
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desc->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 ltc3589_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 ltc3589_matches[index].of_node;
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}
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#else
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static inline int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
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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 ltc3589_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3589_IRQSTAT:
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case LTC3589_SCR1:
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case LTC3589_OVEN:
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case LTC3589_SCR2:
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case LTC3589_VCCR:
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case LTC3589_CLIRQ:
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case LTC3589_B1DTV1:
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case LTC3589_B1DTV2:
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case LTC3589_VRRCR:
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case LTC3589_B2DTV1:
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case LTC3589_B2DTV2:
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case LTC3589_B3DTV1:
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case LTC3589_B3DTV2:
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case LTC3589_L2DTV1:
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case LTC3589_L2DTV2:
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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 ltc3589_readable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3589_IRQSTAT:
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case LTC3589_SCR1:
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case LTC3589_OVEN:
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case LTC3589_SCR2:
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case LTC3589_PGSTAT:
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case LTC3589_VCCR:
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case LTC3589_B1DTV1:
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case LTC3589_B1DTV2:
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case LTC3589_VRRCR:
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case LTC3589_B2DTV1:
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case LTC3589_B2DTV2:
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case LTC3589_B3DTV1:
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case LTC3589_B3DTV2:
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case LTC3589_L2DTV1:
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case LTC3589_L2DTV2:
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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 ltc3589_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTC3589_IRQSTAT:
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case LTC3589_PGSTAT:
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case LTC3589_VCCR:
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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 reg_default ltc3589_reg_defaults[] = {
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{ LTC3589_SCR1, 0x00 },
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{ LTC3589_OVEN, 0x00 },
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{ LTC3589_SCR2, 0x00 },
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{ LTC3589_VCCR, 0x00 },
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{ LTC3589_B1DTV1, 0x19 },
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{ LTC3589_B1DTV2, 0x19 },
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{ LTC3589_VRRCR, 0xff },
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{ LTC3589_B2DTV1, 0x19 },
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{ LTC3589_B2DTV2, 0x19 },
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{ LTC3589_B3DTV1, 0x19 },
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{ LTC3589_B3DTV2, 0x19 },
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{ LTC3589_L2DTV1, 0x19 },
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{ LTC3589_L2DTV2, 0x19 },
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};
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static const struct regmap_config ltc3589_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.writeable_reg = ltc3589_writeable_reg,
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.readable_reg = ltc3589_readable_reg,
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.volatile_reg = ltc3589_volatile_reg,
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.max_register = LTC3589_L2DTV2,
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.reg_defaults = ltc3589_reg_defaults,
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.num_reg_defaults = ARRAY_SIZE(ltc3589_reg_defaults),
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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 ltc3589_isr(int irq, void *dev_id)
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{
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struct ltc3589 *ltc3589 = dev_id;
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unsigned int i, irqstat, event;
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regmap_read(ltc3589->regmap, LTC3589_IRQSTAT, &irqstat);
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if (irqstat & LTC3589_IRQSTAT_THERMAL_WARN) {
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event = REGULATOR_EVENT_OVER_TEMP;
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for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
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regulator_notifier_call_chain(ltc3589->regulators[i],
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event, NULL);
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}
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if (irqstat & LTC3589_IRQSTAT_UNDERVOLT_WARN) {
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event = REGULATOR_EVENT_UNDER_VOLTAGE;
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for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
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regulator_notifier_call_chain(ltc3589->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(ltc3589->regmap, LTC3589_CLIRQ, 0);
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return IRQ_HANDLED;
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}
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static inline unsigned int ltc3589_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 ltc3589_apply_fb_voltage_divider(struct ltc3589_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 = ltc3589_scale(desc->min_uV, rdesc->r1, rdesc->r2);
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desc->uV_step = ltc3589_scale(desc->uV_step, rdesc->r1, rdesc->r2);
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desc->fixed_uV = ltc3589_scale(desc->fixed_uV, rdesc->r1, rdesc->r2);
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}
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static int ltc3589_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 ltc3589_regulator *descs;
|
|
struct ltc3589 *ltc3589;
|
|
int i, ret;
|
|
|
|
ltc3589 = devm_kzalloc(dev, sizeof(*ltc3589), GFP_KERNEL);
|
|
if (!ltc3589)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, ltc3589);
|
|
ltc3589->variant = id->driver_data;
|
|
ltc3589->dev = dev;
|
|
|
|
descs = ltc3589->regulator_descs;
|
|
memcpy(descs, ltc3589_regulators, sizeof(ltc3589_regulators));
|
|
if (ltc3589->variant == LTC3589) {
|
|
descs[LTC3589_LDO3].desc.fixed_uV = 1800000;
|
|
descs[LTC3589_LDO4].desc.volt_table = ltc3589_ldo4;
|
|
} else {
|
|
descs[LTC3589_LDO3].desc.fixed_uV = 2800000;
|
|
descs[LTC3589_LDO4].desc.volt_table = ltc3589_12_ldo4;
|
|
}
|
|
|
|
ltc3589->regmap = devm_regmap_init_i2c(client, <c3589_regmap_config);
|
|
if (IS_ERR(ltc3589->regmap)) {
|
|
ret = PTR_ERR(ltc3589->regmap);
|
|
dev_err(dev, "failed to initialize regmap: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = ltc3589_parse_regulators_dt(ltc3589);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
|
|
struct ltc3589_regulator *rdesc = <c3589->regulator_descs[i];
|
|
struct regulator_desc *desc = &rdesc->desc;
|
|
struct regulator_init_data *init_data;
|
|
struct regulator_config config = { };
|
|
|
|
init_data = match_init_data(i);
|
|
|
|
if (i < LTC3589_LDO3)
|
|
ltc3589_apply_fb_voltage_divider(rdesc);
|
|
|
|
config.dev = dev;
|
|
config.init_data = init_data;
|
|
config.driver_data = ltc3589;
|
|
config.of_node = match_of_node(i);
|
|
|
|
ltc3589->regulators[i] = devm_regulator_register(dev, desc,
|
|
&config);
|
|
if (IS_ERR(ltc3589->regulators[i])) {
|
|
ret = PTR_ERR(ltc3589->regulators[i]);
|
|
dev_err(dev, "failed to register regulator %s: %d\n",
|
|
desc->name, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(dev, client->irq, NULL, ltc3589_isr,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
client->name, ltc3589);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to request IRQ: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_device_id ltc3589_i2c_id[] = {
|
|
{ "ltc3589", LTC3589 },
|
|
{ "ltc3589-1", LTC3589_1 },
|
|
{ "ltc3589-2", LTC3589_2 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ltc3589_i2c_id);
|
|
|
|
static struct i2c_driver ltc3589_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
.probe = ltc3589_probe,
|
|
.id_table = ltc3589_i2c_id,
|
|
};
|
|
module_i2c_driver(ltc3589_driver);
|
|
|
|
MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
|
|
MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3589(-1,2)");
|
|
MODULE_LICENSE("GPL v2");
|