324 lines
7.9 KiB
C
324 lines
7.9 KiB
C
/*
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* PCAP2 Regulator Driver
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*
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* Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
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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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#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/err.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/mfd/ezx-pcap.h>
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static const u16 V1_table[] = {
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2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,
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};
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static const u16 V2_table[] = {
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2500, 2775,
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};
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static const u16 V3_table[] = {
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1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,
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};
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static const u16 V4_table[] = {
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1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,
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};
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static const u16 V5_table[] = {
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1875, 2275, 2475, 2775,
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};
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static const u16 V6_table[] = {
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2475, 2775,
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};
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static const u16 V7_table[] = {
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1875, 2775,
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};
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#define V8_table V4_table
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static const u16 V9_table[] = {
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1575, 1875, 2475, 2775,
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};
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static const u16 V10_table[] = {
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5000,
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};
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static const u16 VAUX1_table[] = {
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1875, 2475, 2775, 3000,
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};
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#define VAUX2_table VAUX1_table
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static const u16 VAUX3_table[] = {
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1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,
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2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,
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};
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static const u16 VAUX4_table[] = {
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1800, 1800, 3000, 5000,
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};
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static const u16 VSIM_table[] = {
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1875, 3000,
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};
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static const u16 VSIM2_table[] = {
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1875,
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};
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static const u16 VVIB_table[] = {
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1300, 1800, 2000, 3000,
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};
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static const u16 SW1_table[] = {
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900, 950, 1000, 1050, 1100, 1150, 1200, 1250,
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1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250,
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};
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#define SW2_table SW1_table
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static const u16 SW3_table[] = {
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4000, 4500, 5000, 5500,
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};
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struct pcap_regulator {
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const u8 reg;
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const u8 en;
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const u8 index;
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const u8 stby;
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const u8 lowpwr;
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const u8 n_voltages;
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const u16 *voltage_table;
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};
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#define NA 0xff
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#define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr) \
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[_vreg] = { \
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.reg = _reg, \
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.en = _en, \
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.index = _index, \
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.stby = _stby, \
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.lowpwr = _lowpwr, \
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.n_voltages = ARRAY_SIZE(_vreg##_table), \
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.voltage_table = _vreg##_table, \
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}
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static struct pcap_regulator vreg_table[] = {
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VREG_INFO(V1, PCAP_REG_VREG1, 1, 2, 18, 0),
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VREG_INFO(V2, PCAP_REG_VREG1, 5, 6, 19, 22),
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VREG_INFO(V3, PCAP_REG_VREG1, 7, 8, 20, 23),
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VREG_INFO(V4, PCAP_REG_VREG1, 11, 12, 21, 24),
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/* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
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VREG_INFO(V5, PCAP_REG_VREG1, 15, 16, 12, 19),
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VREG_INFO(V6, PCAP_REG_VREG2, 1, 2, 14, 20),
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VREG_INFO(V7, PCAP_REG_VREG2, 3, 4, 15, 21),
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VREG_INFO(V8, PCAP_REG_VREG2, 5, 6, 16, 22),
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VREG_INFO(V9, PCAP_REG_VREG2, 9, 10, 17, 23),
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VREG_INFO(V10, PCAP_REG_VREG2, 10, NA, 18, 24),
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VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1, 2, 22, 23),
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/* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
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VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4, 5, 0, 1),
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VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7, 8, 2, 3),
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VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4, 5),
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VREG_INFO(VSIM, PCAP_REG_AUXVREG, 17, 18, NA, 6),
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VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
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VREG_INFO(VVIB, PCAP_REG_AUXVREG, 19, 20, NA, NA),
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VREG_INFO(SW1, PCAP_REG_SWCTRL, 1, 2, NA, NA),
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VREG_INFO(SW2, PCAP_REG_SWCTRL, 6, 7, NA, NA),
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/* SW3 STBY is on PCAP_REG_AUXVREG */
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VREG_INFO(SW3, PCAP_REG_SWCTRL, 11, 12, 24, NA),
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/* SWxS used to control SWx voltage on standby */
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/* VREG_INFO(SW1S, PCAP_REG_LOWPWR, NA, 12, NA, NA),
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VREG_INFO(SW2S, PCAP_REG_LOWPWR, NA, 20, NA, NA), */
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};
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static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV,
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unsiged *selector)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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void *pcap = rdev_get_drvdata(rdev);
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int uV;
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u8 i;
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/* the regulator doesn't support voltage switching */
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if (vreg->n_voltages == 1)
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return -EINVAL;
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for (i = 0; i < vreg->n_voltages; i++) {
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/* For V1 the first is not the best match */
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if (i == 0 && rdev_get_id(rdev) == V1)
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i = 1;
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else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)
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i = 0;
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uV = vreg->voltage_table[i] * 1000;
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if (min_uV <= uV && uV <= max_uV) {
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*selector = i;
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return ezx_pcap_set_bits(pcap, vreg->reg,
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(vreg->n_voltages - 1) << vreg->index,
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i << vreg->index);
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}
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if (i == 0 && rdev_get_id(rdev) == V1)
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i = vreg->n_voltages - 1;
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}
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/* the requested voltage range is not supported by this regulator */
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return -EINVAL;
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}
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static int pcap_regulator_get_voltage(struct regulator_dev *rdev)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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void *pcap = rdev_get_drvdata(rdev);
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u32 tmp;
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int mV;
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if (vreg->n_voltages == 1)
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return vreg->voltage_table[0] * 1000;
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ezx_pcap_read(pcap, vreg->reg, &tmp);
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tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));
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mV = vreg->voltage_table[tmp];
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return mV * 1000;
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}
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static int pcap_regulator_enable(struct regulator_dev *rdev)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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void *pcap = rdev_get_drvdata(rdev);
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if (vreg->en == NA)
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return -EINVAL;
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return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
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}
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static int pcap_regulator_disable(struct regulator_dev *rdev)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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void *pcap = rdev_get_drvdata(rdev);
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if (vreg->en == NA)
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return -EINVAL;
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return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
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}
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static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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void *pcap = rdev_get_drvdata(rdev);
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u32 tmp;
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if (vreg->en == NA)
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return -EINVAL;
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ezx_pcap_read(pcap, vreg->reg, &tmp);
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return (tmp >> vreg->en) & 1;
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}
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static int pcap_regulator_list_voltage(struct regulator_dev *rdev,
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unsigned int index)
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{
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struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
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return vreg->voltage_table[index] * 1000;
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}
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static struct regulator_ops pcap_regulator_ops = {
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.list_voltage = pcap_regulator_list_voltage,
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.set_voltage = pcap_regulator_set_voltage,
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.get_voltage = pcap_regulator_get_voltage,
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.enable = pcap_regulator_enable,
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.disable = pcap_regulator_disable,
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.is_enabled = pcap_regulator_is_enabled,
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};
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#define VREG(_vreg) \
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[_vreg] = { \
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.name = #_vreg, \
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.id = _vreg, \
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.n_voltages = ARRAY_SIZE(_vreg##_table), \
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.ops = &pcap_regulator_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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}
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static struct regulator_desc pcap_regulators[] = {
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VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
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VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
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VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
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};
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static int __devinit pcap_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_dev *rdev;
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void *pcap = dev_get_drvdata(pdev->dev.parent);
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rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,
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pdev->dev.platform_data, pcap);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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platform_set_drvdata(pdev, rdev);
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return 0;
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}
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static int __devexit pcap_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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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver pcap_regulator_driver = {
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.driver = {
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.name = "pcap-regulator",
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.owner = THIS_MODULE,
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},
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.probe = pcap_regulator_probe,
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.remove = __devexit_p(pcap_regulator_remove),
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};
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static int __init pcap_regulator_init(void)
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{
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return platform_driver_register(&pcap_regulator_driver);
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}
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static void __exit pcap_regulator_exit(void)
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{
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platform_driver_unregister(&pcap_regulator_driver);
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}
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subsys_initcall(pcap_regulator_init);
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module_exit(pcap_regulator_exit);
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MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
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MODULE_DESCRIPTION("PCAP2 Regulator Driver");
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MODULE_LICENSE("GPL");
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