390 строки
11 KiB
C
390 строки
11 KiB
C
/*
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* max77686.c - Regulator driver for the Maxim 77686
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*
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* Copyright (C) 2012 Samsung Electronics
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* Chiwoong Byun <woong.byun@smasung.com>
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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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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* This driver is based on max8997.c
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*/
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/platform_device.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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#include <linux/mfd/max77686.h>
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#include <linux/mfd/max77686-private.h>
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#define MAX77686_LDO_MINUV 800000
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#define MAX77686_LDO_UVSTEP 50000
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#define MAX77686_LDO_LOW_MINUV 800000
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#define MAX77686_LDO_LOW_UVSTEP 25000
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#define MAX77686_BUCK_MINUV 750000
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#define MAX77686_BUCK_UVSTEP 50000
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#define MAX77686_RAMP_DELAY 100000 /* uV/us */
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#define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
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#define MAX77686_DVS_MINUV 600000
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#define MAX77686_DVS_UVSTEP 12500
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#define MAX77686_OPMODE_SHIFT 6
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#define MAX77686_OPMODE_BUCK234_SHIFT 4
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#define MAX77686_OPMODE_MASK 0x3
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#define MAX77686_VSEL_MASK 0x3F
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#define MAX77686_DVS_VSEL_MASK 0xFF
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#define MAX77686_RAMP_RATE_MASK 0xC0
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#define MAX77686_REGULATORS MAX77686_REG_MAX
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#define MAX77686_LDOS 26
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enum max77686_ramp_rate {
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RAMP_RATE_13P75MV,
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RAMP_RATE_27P5MV,
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RAMP_RATE_55MV,
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RAMP_RATE_NO_CTRL, /* 100mV/us */
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};
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struct max77686_data {
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struct regulator_dev **rdev;
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};
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static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
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{
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unsigned int ramp_value = RAMP_RATE_NO_CTRL;
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switch (ramp_delay) {
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case 1 ... 13750:
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ramp_value = RAMP_RATE_13P75MV;
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break;
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case 13751 ... 27500:
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ramp_value = RAMP_RATE_27P5MV;
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break;
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case 27501 ... 55000:
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ramp_value = RAMP_RATE_55MV;
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break;
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case 55001 ... 100000:
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break;
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default:
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pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
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rdev->desc->name, ramp_delay);
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}
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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MAX77686_RAMP_RATE_MASK, ramp_value << 6);
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}
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static struct regulator_ops max77686_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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};
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static struct regulator_ops max77686_buck_dvs_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_ramp_delay = max77686_set_ramp_delay,
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};
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#define regulator_desc_ldo(num) { \
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.name = "LDO"#num, \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_MINUV, \
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.uV_step = MAX77686_LDO_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_ldo_low(num) { \
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.name = "LDO"#num, \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_LOW_MINUV, \
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.uV_step = MAX77686_LDO_LOW_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_buck(num) { \
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.name = "BUCK"#num, \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_BUCK_MINUV, \
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.uV_step = MAX77686_BUCK_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
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.enable_mask = MAX77686_OPMODE_MASK, \
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}
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#define regulator_desc_buck1(num) { \
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.name = "BUCK"#num, \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_BUCK_MINUV, \
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.uV_step = MAX77686_BUCK_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_BUCK1OUT, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_BUCK1CTRL, \
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.enable_mask = MAX77686_OPMODE_MASK, \
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}
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#define regulator_desc_buck_dvs(num) { \
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.name = "BUCK"#num, \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_buck_dvs_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_DVS_MINUV, \
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.uV_step = MAX77686_DVS_UVSTEP, \
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.ramp_delay = MAX77686_DVS_RAMP_DELAY, \
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.n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
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.vsel_mask = MAX77686_DVS_VSEL_MASK, \
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.enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_BUCK234_SHIFT, \
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}
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static struct regulator_desc regulators[] = {
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regulator_desc_ldo_low(1),
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regulator_desc_ldo_low(2),
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regulator_desc_ldo(3),
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regulator_desc_ldo(4),
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regulator_desc_ldo(5),
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regulator_desc_ldo_low(6),
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regulator_desc_ldo_low(7),
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regulator_desc_ldo_low(8),
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regulator_desc_ldo(9),
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regulator_desc_ldo(10),
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regulator_desc_ldo(11),
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regulator_desc_ldo(12),
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regulator_desc_ldo(13),
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regulator_desc_ldo(14),
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regulator_desc_ldo_low(15),
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regulator_desc_ldo(16),
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regulator_desc_ldo(17),
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regulator_desc_ldo(18),
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regulator_desc_ldo(19),
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regulator_desc_ldo(20),
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regulator_desc_ldo(21),
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regulator_desc_ldo(22),
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regulator_desc_ldo(23),
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regulator_desc_ldo(24),
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regulator_desc_ldo(25),
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regulator_desc_ldo(26),
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regulator_desc_buck1(1),
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regulator_desc_buck_dvs(2),
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regulator_desc_buck_dvs(3),
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regulator_desc_buck_dvs(4),
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regulator_desc_buck(5),
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regulator_desc_buck(6),
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regulator_desc_buck(7),
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regulator_desc_buck(8),
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regulator_desc_buck(9),
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};
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#ifdef CONFIG_OF
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static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
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struct max77686_platform_data *pdata)
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{
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struct device_node *pmic_np, *regulators_np;
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struct max77686_regulator_data *rdata;
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struct of_regulator_match rmatch;
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unsigned int i;
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pmic_np = iodev->dev->of_node;
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regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
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if (!regulators_np) {
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dev_err(iodev->dev, "could not find regulators sub-node\n");
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return -EINVAL;
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}
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pdata->num_regulators = ARRAY_SIZE(regulators);
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rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
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pdata->num_regulators, GFP_KERNEL);
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if (!rdata) {
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dev_err(iodev->dev,
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"could not allocate memory for regulator data\n");
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return -ENOMEM;
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}
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for (i = 0; i < pdata->num_regulators; i++) {
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rmatch.name = regulators[i].name;
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rmatch.init_data = NULL;
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rmatch.of_node = NULL;
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of_regulator_match(iodev->dev, regulators_np, &rmatch, 1);
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rdata[i].initdata = rmatch.init_data;
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}
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pdata->regulators = rdata;
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return 0;
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}
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#else
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static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
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struct max77686_platform_data *pdata)
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{
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return 0;
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}
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#endif /* CONFIG_OF */
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static __devinit int max77686_pmic_probe(struct platform_device *pdev)
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{
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struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
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struct regulator_dev **rdev;
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struct max77686_data *max77686;
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int i, size;
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int ret = 0;
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struct regulator_config config = { };
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dev_dbg(&pdev->dev, "%s\n", __func__);
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data found for regulator\n");
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return -ENODEV;
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}
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if (iodev->dev->of_node) {
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ret = max77686_pmic_dt_parse_pdata(iodev, pdata);
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if (ret)
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return ret;
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}
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if (pdata->num_regulators != MAX77686_REGULATORS) {
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dev_err(&pdev->dev,
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"Invalid initial data for regulator's initialiation\n");
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return -EINVAL;
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}
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max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
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GFP_KERNEL);
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if (!max77686)
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return -ENOMEM;
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size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS;
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max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
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if (!max77686->rdev)
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return -ENOMEM;
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rdev = max77686->rdev;
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config.dev = &pdev->dev;
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config.regmap = iodev->regmap;
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platform_set_drvdata(pdev, max77686);
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for (i = 0; i < MAX77686_REGULATORS; i++) {
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config.init_data = pdata->regulators[i].initdata;
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rdev[i] = regulator_register(®ulators[i], &config);
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if (IS_ERR(rdev[i])) {
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ret = PTR_ERR(rdev[i]);
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dev_err(&pdev->dev,
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"regulator init failed for %d\n", i);
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rdev[i] = NULL;
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goto err;
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}
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}
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return 0;
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err:
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while (--i >= 0)
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regulator_unregister(rdev[i]);
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return ret;
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}
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static int __devexit max77686_pmic_remove(struct platform_device *pdev)
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{
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struct max77686_data *max77686 = platform_get_drvdata(pdev);
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struct regulator_dev **rdev = max77686->rdev;
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int i;
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for (i = 0; i < MAX77686_REGULATORS; i++)
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if (rdev[i])
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regulator_unregister(rdev[i]);
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return 0;
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}
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static const struct platform_device_id max77686_pmic_id[] = {
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{"max77686-pmic", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
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static struct platform_driver max77686_pmic_driver = {
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.driver = {
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.name = "max77686-pmic",
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.owner = THIS_MODULE,
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},
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.probe = max77686_pmic_probe,
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.remove = __devexit_p(max77686_pmic_remove),
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.id_table = max77686_pmic_id,
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};
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static int __init max77686_pmic_init(void)
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{
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return platform_driver_register(&max77686_pmic_driver);
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}
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subsys_initcall(max77686_pmic_init);
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static void __exit max77686_pmic_cleanup(void)
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{
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platform_driver_unregister(&max77686_pmic_driver);
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}
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module_exit(max77686_pmic_cleanup);
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MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
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MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
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MODULE_LICENSE("GPL");
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