329 lines
8.9 KiB
C
329 lines
8.9 KiB
C
/*
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* TI TPS65132 Regulator driver
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*
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* Copyright (C) 2015 NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
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* whether express or implied; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.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/slab.h>
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#include <linux/delay.h>
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#define tps65132_rails(_name) "tps65132-"#_name
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#define TPS65132_REG_VPOS 0x00
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#define TPS65132_REG_VNEG 0x01
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#define TPS65132_REG_APPS_DISP_DISN 0x03
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#define TPS65132_REG_CONTROL 0x0FF
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#define TPS65132_VOUT_MASK 0x1F
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#define TPS65132_VOUT_N_VOLTAGE 0x15
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#define TPS65132_VOUT_VMIN 4000000
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#define TPS65132_VOUT_VMAX 6000000
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#define TPS65132_VOUT_STEP 100000
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#define TPS65132_REG_APPS_DISN BIT(0)
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#define TPS65132_REG_APPS_DISP BIT(1)
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#define TPS65132_REGULATOR_ID_VPOS 0
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#define TPS65132_REGULATOR_ID_VNEG 1
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#define TPS65132_MAX_REGULATORS 2
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#define TPS65132_ACT_DIS_TIME_SLACK 1000
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struct tps65132_regulator_pdata {
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int enable_gpio;
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bool disable_active_discharge;
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struct regulator_init_data *ridata;
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int active_discharge_gpio;
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unsigned int active_discharge_time;
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};
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struct tps65132_regulator {
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struct device *dev;
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struct regmap *rmap;
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struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS];
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struct tps65132_regulator_pdata reg_pdata[TPS65132_MAX_REGULATORS];
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struct regulator_dev *rdev[TPS65132_MAX_REGULATORS];
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};
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static int tps65132_post_enable(struct regulator_dev *rdev)
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{
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struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev);
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unsigned int dis_mask;
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int ret;
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dis_mask = (id == TPS65132_REGULATOR_ID_VPOS) ?
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TPS65132_REG_APPS_DISP : TPS65132_REG_APPS_DISN;
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if (tps->reg_pdata[id].disable_active_discharge) {
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ret = regmap_update_bits(tps->rmap, TPS65132_REG_APPS_DISP_DISN,
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dis_mask, 0);
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if (ret < 0) {
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dev_err(tps->dev,
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"Reg APPS_DISP_DISN update failed: %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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static int tps65132_post_disable(struct regulator_dev *rdev)
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{
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struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev);
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int act_dis_gpio = tps->reg_pdata[id].active_discharge_gpio;
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unsigned int act_dis_time_us = tps->reg_pdata[id].active_discharge_time;
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if (gpio_is_valid(act_dis_gpio)) {
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gpio_set_value_cansleep(act_dis_gpio, 1);
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usleep_range(act_dis_time_us,
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act_dis_time_us + TPS65132_ACT_DIS_TIME_SLACK);
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gpio_set_value_cansleep(act_dis_gpio, 0);
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}
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return 0;
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}
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static struct regulator_ops tps65132_regulator_ops = {
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.post_enable = tps65132_post_enable,
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.post_disable = tps65132_post_disable,
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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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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};
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#define TPS65132_REGULATOR_DESC(_id, _name) \
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[TPS65132_REGULATOR_ID_##_id] = { \
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.name = tps65132_rails(_name), \
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.supply_name = "vin", \
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.id = TPS65132_REGULATOR_ID_##_id, \
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.ops = &tps65132_regulator_ops, \
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.n_voltages = TPS65132_VOUT_N_VOLTAGE, \
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.min_uV = TPS65132_VOUT_VMIN, \
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.uV_step = TPS65132_VOUT_STEP, \
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.enable_time = 500, \
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.vsel_mask = TPS65132_VOUT_MASK, \
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.vsel_reg = TPS65132_REG_##_id, \
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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 tps65132_regs_desc[TPS65132_MAX_REGULATORS] = {
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TPS65132_REGULATOR_DESC(VPOS, outp),
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TPS65132_REGULATOR_DESC(VNEG, outn),
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};
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static struct of_regulator_match tps65132_regulator_matches[] = {
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{ .name = "outp", },
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{ .name = "outn", },
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};
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static int tps65132_get_regulator_dt_data(struct device *dev,
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struct tps65132_regulator *tps65132_regs)
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{
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struct tps65132_regulator_pdata *rpdata;
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struct device_node *rnode;
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int id;
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int ret;
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ret = of_regulator_match(dev, dev->of_node, tps65132_regulator_matches,
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ARRAY_SIZE(tps65132_regulator_matches));
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if (ret < 0) {
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dev_err(dev, "node parsing for regulator failed: %d\n", ret);
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return ret;
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}
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for (id = 0; id < ARRAY_SIZE(tps65132_regulator_matches); ++id) {
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rpdata = &tps65132_regs->reg_pdata[id];
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rnode = tps65132_regulator_matches[id].of_node;
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if (!rnode)
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continue;
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rpdata->ridata = tps65132_regulator_matches[id].init_data;
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rpdata->enable_gpio = of_get_named_gpio(rnode,
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"ti,enable-gpio", 0);
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if (rpdata->enable_gpio == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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rpdata->disable_active_discharge = of_property_read_bool(rnode,
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"ti,disable-active-discharge");
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rpdata->active_discharge_gpio = of_get_named_gpio(rnode,
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"ti,active-discharge-gpio", 0);
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if (rpdata->active_discharge_gpio == -EPROBE_DEFER) {
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return -EPROBE_DEFER;
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} else if (gpio_is_valid(rpdata->active_discharge_gpio)) {
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ret = of_property_read_u32(rnode,
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"ti,active-discharge-time",
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&rpdata->active_discharge_time);
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if (ret < 0) {
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dev_err(dev, "Discharge time read failed: %d\n",
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ret);
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return ret;
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}
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}
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}
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return 0;
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}
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static const struct regmap_range tps65132_no_reg_ranges[] = {
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regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
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TPS65132_REG_CONTROL - 1),
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};
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static const struct regmap_access_table tps65132_no_reg_table = {
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.no_ranges = tps65132_no_reg_ranges,
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.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
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};
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static const struct regmap_config tps65132_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = TPS65132_REG_CONTROL + 1,
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.cache_type = REGCACHE_NONE,
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.rd_table = &tps65132_no_reg_table,
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.wr_table = &tps65132_no_reg_table,
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};
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static int tps65132_probe(struct i2c_client *client,
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const struct i2c_device_id *client_id)
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{
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struct device *dev = &client->dev;
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struct tps65132_regulator_pdata *rpdata;
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struct regulator_config config = { };
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struct regulator_desc *rdesc;
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struct tps65132_regulator *tps;
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int id;
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int ret;
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tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
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if (!tps) {
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dev_err(dev, "memory alloc failed\n");
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return -ENOMEM;
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}
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ret = tps65132_get_regulator_dt_data(dev, tps);
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if (ret == -EPROBE_DEFER) {
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dev_err(dev, "Probe deffered\n");
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return ret;
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} else if (ret < 0) {
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dev_err(dev, "Reading data from DT failed: %d\n", ret);
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return ret;
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}
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tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
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if (IS_ERR(tps->rmap)) {
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ret = PTR_ERR(tps->rmap);
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dev_err(dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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i2c_set_clientdata(client, tps);
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tps->dev = dev;
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for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
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rdesc = &tps65132_regs_desc[id];
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tps->rdesc[id] = rdesc;
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rpdata = &tps->reg_pdata[id];
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config.regmap = tps->rmap;
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config.dev = dev;
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config.init_data = rpdata->ridata;
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config.driver_data = tps;
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config.of_node = tps65132_regulator_matches[id].of_node;
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if (gpio_is_valid(rpdata->enable_gpio)) {
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config.ena_gpio = rpdata->enable_gpio;
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if (rpdata->ridata &&
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(rpdata->ridata->constraints.always_on ||
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rpdata->ridata->constraints.boot_on))
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config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
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}
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if (gpio_is_valid(rpdata->active_discharge_gpio)) {
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ret = devm_gpio_request_one(dev,
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rpdata->active_discharge_gpio,
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GPIOF_OUT_INIT_LOW, rdesc->name);
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if (ret < 0) {
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dev_err(dev,
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"act dis gpio req failed for %s: %d\n",
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rdesc->name, ret);
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return ret;
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}
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} else {
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dev_info(dev, "No active discharge gpio for regulator %s\n",
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rdesc->name);
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}
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tps->rdev[id] = devm_regulator_register(dev, rdesc, &config);
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if (IS_ERR(tps->rdev[id])) {
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ret = PTR_ERR(tps->rdev[id]);
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dev_err(dev, "regulator %s register failed: %d\n",
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rdesc->name, ret);
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return ret;
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}
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}
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return 0;
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}
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static const struct i2c_device_id tps65132_id[] = {
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{.name = "tps65132",},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, tps65132_id);
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static struct i2c_driver tps65132_i2c_driver = {
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.driver = {
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.name = "tps65132",
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.owner = THIS_MODULE,
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},
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.probe = tps65132_probe,
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.id_table = tps65132_id,
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};
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static int __init tps65132_init(void)
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{
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return i2c_add_driver(&tps65132_i2c_driver);
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}
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subsys_initcall(tps65132_init);
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static void __exit tps65132_exit(void)
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{
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i2c_del_driver(&tps65132_i2c_driver);
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}
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module_exit(tps65132_exit);
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("tps65132 regulator driver");
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MODULE_VERSION("1.0");
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