a6576cff18
This patch implements list_voltage for the pcf50644 regulator driver. As the voltages are linearly scaled the code to convert register values to voltages can be reused and most of the code can be shared with get_voltage. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
363 lines
9.0 KiB
C
363 lines
9.0 KiB
C
/* NXP PCF50633 PMIC Driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* Broken down from monstrous PCF50633 driver mainly by
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* Harald Welte and Andy Green and Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/pcf50633/core.h>
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#include <linux/mfd/pcf50633/pmic.h>
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#define PCF50633_REGULATOR(_name, _id, _n) \
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{ \
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.name = _name, \
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.id = _id, \
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.ops = &pcf50633_regulator_ops, \
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.n_voltages = _n, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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}
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static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
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[PCF50633_REGULATOR_AUTO] = PCF50633_REG_AUTOOUT,
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[PCF50633_REGULATOR_DOWN1] = PCF50633_REG_DOWN1OUT,
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[PCF50633_REGULATOR_DOWN2] = PCF50633_REG_DOWN2OUT,
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[PCF50633_REGULATOR_MEMLDO] = PCF50633_REG_MEMLDOOUT,
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[PCF50633_REGULATOR_LDO1] = PCF50633_REG_LDO1OUT,
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[PCF50633_REGULATOR_LDO2] = PCF50633_REG_LDO2OUT,
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[PCF50633_REGULATOR_LDO3] = PCF50633_REG_LDO3OUT,
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[PCF50633_REGULATOR_LDO4] = PCF50633_REG_LDO4OUT,
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[PCF50633_REGULATOR_LDO5] = PCF50633_REG_LDO5OUT,
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[PCF50633_REGULATOR_LDO6] = PCF50633_REG_LDO6OUT,
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[PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT,
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};
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/* Bits from voltage value */
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static u8 auto_voltage_bits(unsigned int millivolts)
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{
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if (millivolts < 1800)
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return 0;
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if (millivolts > 3800)
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return 0xff;
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millivolts -= 625;
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return millivolts / 25;
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}
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static u8 down_voltage_bits(unsigned int millivolts)
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{
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if (millivolts < 625)
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return 0;
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else if (millivolts > 3000)
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return 0xff;
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millivolts -= 625;
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return millivolts / 25;
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}
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static u8 ldo_voltage_bits(unsigned int millivolts)
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{
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if (millivolts < 900)
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return 0;
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else if (millivolts > 3600)
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return 0x1f;
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millivolts -= 900;
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return millivolts / 100;
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}
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/* Obtain voltage value from bits */
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static unsigned int auto_voltage_value(u8 bits)
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{
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if (bits < 0x2f)
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return 0;
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return 625 + (bits * 25);
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}
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static unsigned int down_voltage_value(u8 bits)
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{
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return 625 + (bits * 25);
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}
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static unsigned int ldo_voltage_value(u8 bits)
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{
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bits &= 0x1f;
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return 900 + (bits * 100);
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}
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static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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struct pcf50633 *pcf;
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int regulator_id, millivolts;
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u8 volt_bits, regnr;
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pcf = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= PCF50633_NUM_REGULATORS)
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return -EINVAL;
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millivolts = min_uV / 1000;
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regnr = pcf50633_regulator_registers[regulator_id];
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switch (regulator_id) {
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case PCF50633_REGULATOR_AUTO:
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volt_bits = auto_voltage_bits(millivolts);
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break;
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case PCF50633_REGULATOR_DOWN1:
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volt_bits = down_voltage_bits(millivolts);
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break;
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case PCF50633_REGULATOR_DOWN2:
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volt_bits = down_voltage_bits(millivolts);
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break;
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case PCF50633_REGULATOR_LDO1:
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case PCF50633_REGULATOR_LDO2:
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case PCF50633_REGULATOR_LDO3:
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case PCF50633_REGULATOR_LDO4:
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case PCF50633_REGULATOR_LDO5:
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case PCF50633_REGULATOR_LDO6:
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case PCF50633_REGULATOR_HCLDO:
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volt_bits = ldo_voltage_bits(millivolts);
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break;
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default:
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return -EINVAL;
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}
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return pcf50633_reg_write(pcf, regnr, volt_bits);
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}
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static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
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u8 bits)
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{
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int millivolts;
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switch (id) {
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case PCF50633_REGULATOR_AUTO:
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millivolts = auto_voltage_value(bits);
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break;
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case PCF50633_REGULATOR_DOWN1:
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millivolts = down_voltage_value(bits);
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break;
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case PCF50633_REGULATOR_DOWN2:
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millivolts = down_voltage_value(bits);
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break;
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case PCF50633_REGULATOR_LDO1:
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case PCF50633_REGULATOR_LDO2:
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case PCF50633_REGULATOR_LDO3:
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case PCF50633_REGULATOR_LDO4:
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case PCF50633_REGULATOR_LDO5:
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case PCF50633_REGULATOR_LDO6:
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case PCF50633_REGULATOR_HCLDO:
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millivolts = ldo_voltage_value(bits);
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break;
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default:
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return -EINVAL;
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}
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return millivolts * 1000;
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}
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static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
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{
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struct pcf50633 *pcf;
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int regulator_id;
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u8 volt_bits, regnr;
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pcf = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= PCF50633_NUM_REGULATORS)
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return -EINVAL;
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regnr = pcf50633_regulator_registers[regulator_id];
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volt_bits = pcf50633_reg_read(pcf, regnr);
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return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
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}
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static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
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unsigned int index)
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{
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struct pcf50633 *pcf;
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int regulator_id;
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pcf = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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switch (regulator_id) {
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case PCF50633_REGULATOR_AUTO:
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index += 0x2f;
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break;
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case PCF50633_REGULATOR_HCLDO:
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index += 0x01;
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break;
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default:
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break;
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}
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return pcf50633_regulator_voltage_value(regulator_id, index);
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}
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static int pcf50633_regulator_enable(struct regulator_dev *rdev)
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{
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struct pcf50633 *pcf = rdev_get_drvdata(rdev);
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int regulator_id;
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u8 regnr;
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= PCF50633_NUM_REGULATORS)
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return -EINVAL;
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/* The *ENA register is always one after the *OUT register */
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regnr = pcf50633_regulator_registers[regulator_id] + 1;
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return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
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PCF50633_REGULATOR_ON);
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}
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static int pcf50633_regulator_disable(struct regulator_dev *rdev)
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{
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struct pcf50633 *pcf = rdev_get_drvdata(rdev);
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int regulator_id;
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u8 regnr;
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= PCF50633_NUM_REGULATORS)
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return -EINVAL;
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/* the *ENA register is always one after the *OUT register */
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regnr = pcf50633_regulator_registers[regulator_id] + 1;
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return pcf50633_reg_set_bit_mask(pcf, regnr,
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PCF50633_REGULATOR_ON, 0);
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}
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static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct pcf50633 *pcf = rdev_get_drvdata(rdev);
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int regulator_id = rdev_get_id(rdev);
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u8 regnr;
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= PCF50633_NUM_REGULATORS)
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return -EINVAL;
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/* the *ENA register is always one after the *OUT register */
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regnr = pcf50633_regulator_registers[regulator_id] + 1;
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return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
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}
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static struct regulator_ops pcf50633_regulator_ops = {
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.set_voltage = pcf50633_regulator_set_voltage,
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.get_voltage = pcf50633_regulator_get_voltage,
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.list_voltage = pcf50633_regulator_list_voltage,
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.enable = pcf50633_regulator_enable,
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.disable = pcf50633_regulator_disable,
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.is_enabled = pcf50633_regulator_is_enabled,
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};
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static struct regulator_desc regulators[] = {
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[PCF50633_REGULATOR_AUTO] =
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PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 80),
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[PCF50633_REGULATOR_DOWN1] =
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PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 95),
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[PCF50633_REGULATOR_DOWN2] =
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PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 95),
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[PCF50633_REGULATOR_LDO1] =
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PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 27),
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[PCF50633_REGULATOR_LDO2] =
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PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 27),
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[PCF50633_REGULATOR_LDO3] =
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PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 27),
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[PCF50633_REGULATOR_LDO4] =
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PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 27),
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[PCF50633_REGULATOR_LDO5] =
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PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 27),
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[PCF50633_REGULATOR_LDO6] =
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PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 27),
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[PCF50633_REGULATOR_HCLDO] =
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PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 26),
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[PCF50633_REGULATOR_MEMLDO] =
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PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 0),
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};
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static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_dev *rdev;
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struct pcf50633 *pcf;
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/* Already set by core driver */
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pcf = platform_get_drvdata(pdev);
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rdev = regulator_register(®ulators[pdev->id], &pdev->dev,
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pdev->dev.platform_data, pcf);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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if (pcf->pdata->regulator_registered)
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pcf->pdata->regulator_registered(pcf, pdev->id);
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return 0;
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}
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static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
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{
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struct regulator_dev *rdev = platform_get_drvdata(pdev);
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regulator_unregister(rdev);
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return 0;
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}
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static struct platform_driver pcf50633_regulator_driver = {
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.driver = {
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.name = "pcf50633-regltr",
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},
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.probe = pcf50633_regulator_probe,
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.remove = __devexit_p(pcf50633_regulator_remove),
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};
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static int __init pcf50633_regulator_init(void)
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{
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return platform_driver_register(&pcf50633_regulator_driver);
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}
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subsys_initcall(pcf50633_regulator_init);
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static void __exit pcf50633_regulator_exit(void)
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{
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platform_driver_unregister(&pcf50633_regulator_driver);
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}
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module_exit(pcf50633_regulator_exit);
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MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
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MODULE_DESCRIPTION("PCF50633 regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcf50633-regulator");
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