295 lines
8.5 KiB
C
295 lines
8.5 KiB
C
/*
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* Regulator driver for RICOH RC5T583 power management chip.
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*
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* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
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* Author: Laxman dewangan <ldewangan@nvidia.com>
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*
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* based on code
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* Copyright (C) 2011 RICOH COMPANY,LTD
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*
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.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/gpio.h>
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#include <linux/mfd/rc5t583.h>
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struct rc5t583_regulator_info {
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int deepsleep_id;
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/* Regulator register address.*/
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uint8_t reg_disc_reg;
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uint8_t disc_bit;
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uint8_t deepsleep_reg;
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/* Chip constraints on regulator behavior */
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int min_uV;
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int max_uV;
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int step_uV;
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/* Regulator specific turn-on delay and voltage settling time*/
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int enable_uv_per_us;
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int change_uv_per_us;
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/* Used by regulator core */
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struct regulator_desc desc;
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};
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struct rc5t583_regulator {
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struct rc5t583_regulator_info *reg_info;
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/* Devices */
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struct device *dev;
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struct rc5t583 *mfd;
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struct regulator_dev *rdev;
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};
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static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector)
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{
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struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
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struct rc5t583_regulator_info *ri = reg->reg_info;
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return ri->min_uV + (ri->step_uV * selector);
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}
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static int rc5t583_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV, unsigned *selector)
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{
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struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
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struct rc5t583_regulator_info *ri = reg->reg_info;
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int sel, ret;
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if (min_uV < ri->min_uV)
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min_uV = ri->min_uV;
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sel = DIV_ROUND_UP(min_uV - ri->min_uV, ri->step_uV);
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if (sel >= rdev->desc->n_voltages) {
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dev_err(&rdev->dev, "Invalid selector 0x%02x\n", sel);
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return -EINVAL;
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}
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*selector = sel;
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ret = rc5t583_update(reg->mfd->dev, rdev->desc->vsel_reg, sel,
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rdev->desc->vsel_mask);
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if (ret < 0)
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dev_err(&rdev->dev, "Error in update voltage register 0x%02x\n",
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rdev->desc->vsel_reg);
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return ret;
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}
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static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
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{
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struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
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int vsel = regulator_get_voltage_sel_regmap(rdev);
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int curr_uV = rc5t583_list_voltage(rdev, vsel);
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return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
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}
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static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
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unsigned int old_selector, unsigned int new_selector)
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{
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struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
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int old_uV, new_uV;
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old_uV = rc5t583_list_voltage(rdev, old_selector);
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if (old_uV < 0)
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return old_uV;
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new_uV = rc5t583_list_voltage(rdev, new_selector);
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if (new_uV < 0)
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return new_uV;
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return DIV_ROUND_UP(abs(old_uV - new_uV),
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reg->reg_info->change_uv_per_us);
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}
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static struct regulator_ops rc5t583_ops = {
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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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.enable_time = rc5t583_regulator_enable_time,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage = rc5t583_set_voltage,
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.list_voltage = rc5t583_list_voltage,
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.set_voltage_time_sel = rc5t583_set_voltage_time_sel,
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};
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#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
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_vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
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{ \
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.reg_disc_reg = RC5T583_REG_##_disc_reg, \
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.disc_bit = _disc_bit, \
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.deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \
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.min_uV = _min_mv * 1000, \
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.max_uV = _max_mv * 1000, \
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.step_uV = _step_uV, \
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.enable_uv_per_us = _enable_mv * 1000, \
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.change_uv_per_us = 40 * 1000, \
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.deepsleep_id = RC5T583_DS_##_id, \
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.desc = { \
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.name = "rc5t583-regulator-"#_id, \
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.id = RC5T583_REGULATOR_##_id, \
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.n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
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.ops = &rc5t583_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.vsel_reg = RC5T583_REG_##_id##DAC, \
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.vsel_mask = _vout_mask, \
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.enable_reg = RC5T583_REG_##_en_reg, \
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.enable_mask = BIT(_en_bit), \
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}, \
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}
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static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
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RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
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RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
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RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
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RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
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RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
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RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
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RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
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RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
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RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
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RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
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RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
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RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
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RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
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RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
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};
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static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
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struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
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struct regulator_init_data *reg_data;
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struct regulator_config config = { };
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struct rc5t583_regulator *reg = NULL;
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struct rc5t583_regulator *regs;
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struct regulator_dev *rdev;
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struct rc5t583_regulator_info *ri;
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int ret;
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int id;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data, exiting...\n");
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return -ENODEV;
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}
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regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
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sizeof(struct rc5t583_regulator), GFP_KERNEL);
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if (!regs) {
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dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
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return -ENOMEM;
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}
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for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
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reg_data = pdata->reg_init_data[id];
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/* No need to register if there is no regulator data */
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if (!reg_data)
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continue;
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reg = ®s[id];
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ri = &rc5t583_reg_info[id];
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reg->reg_info = ri;
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reg->mfd = rc5t583;
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reg->dev = &pdev->dev;
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if (ri->deepsleep_id == RC5T583_DS_NONE)
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goto skip_ext_pwr_config;
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ret = rc5t583_ext_power_req_config(rc5t583->dev,
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ri->deepsleep_id,
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pdata->regulator_ext_pwr_control[id],
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pdata->regulator_deepsleep_slot[id]);
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/*
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* Configuring external control is not a major issue,
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* just give warning.
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*/
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if (ret < 0)
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dev_warn(&pdev->dev,
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"Failed to configure ext control %d\n", id);
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skip_ext_pwr_config:
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config.dev = &pdev->dev;
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config.init_data = reg_data;
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config.driver_data = reg;
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config.regmap = rc5t583->regmap;
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rdev = regulator_register(&ri->desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "Failed to register regulator %s\n",
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ri->desc.name);
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ret = PTR_ERR(rdev);
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goto clean_exit;
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}
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reg->rdev = rdev;
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}
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platform_set_drvdata(pdev, regs);
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return 0;
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clean_exit:
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while (--id >= 0)
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regulator_unregister(regs[id].rdev);
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return ret;
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}
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static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
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{
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struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
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int id;
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for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
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regulator_unregister(regs[id].rdev);
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return 0;
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}
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static struct platform_driver rc5t583_regulator_driver = {
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.driver = {
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.name = "rc5t583-regulator",
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.owner = THIS_MODULE,
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},
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.probe = rc5t583_regulator_probe,
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.remove = __devexit_p(rc5t583_regulator_remove),
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};
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static int __init rc5t583_regulator_init(void)
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{
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return platform_driver_register(&rc5t583_regulator_driver);
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}
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subsys_initcall(rc5t583_regulator_init);
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static void __exit rc5t583_regulator_exit(void)
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{
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platform_driver_unregister(&rc5t583_regulator_driver);
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}
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module_exit(rc5t583_regulator_exit);
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_DESCRIPTION("RC5T583 regulator driver");
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MODULE_ALIAS("platform:rc5t583-regulator");
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MODULE_LICENSE("GPL v2");
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