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