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283 lines
7.7 KiB
283 lines
7.7 KiB
/* |
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* TI TPS65132 Regulator driver |
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* |
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* Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved. |
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* |
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* Author: Venkat Reddy Talla <[email protected]> |
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* Laxman Dewangan <[email protected]> |
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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/delay.h> |
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#include <linux/err.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/module.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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#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_DIS_VPOS BIT(0) |
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#define TPS65132_REG_APPS_DIS_VNEG 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_reg_pdata { |
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struct gpio_desc *en_gpiod; |
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struct gpio_desc *act_dis_gpiod; |
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unsigned int act_dis_time_us; |
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int ena_gpio_state; |
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}; |
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struct tps65132_regulator { |
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struct device *dev; |
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struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS]; |
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}; |
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static int tps65132_regulator_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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struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
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int ret; |
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if (!IS_ERR(rpdata->en_gpiod)) { |
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gpiod_set_value_cansleep(rpdata->en_gpiod, 1); |
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rpdata->ena_gpio_state = 1; |
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} |
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/* Hardware automatically enable discharge bit in enable */ |
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if (rdev->constraints->active_discharge == |
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REGULATOR_ACTIVE_DISCHARGE_DISABLE) { |
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ret = regulator_set_active_discharge_regmap(rdev, false); |
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if (ret < 0) { |
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dev_err(tps->dev, "Failed to disable active discharge: %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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return 0; |
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} |
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static int tps65132_regulator_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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struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
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if (!IS_ERR(rpdata->en_gpiod)) { |
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gpiod_set_value_cansleep(rpdata->en_gpiod, 0); |
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rpdata->ena_gpio_state = 0; |
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} |
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if (!IS_ERR(rpdata->act_dis_gpiod)) { |
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gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1); |
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usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us + |
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TPS65132_ACT_DIS_TIME_SLACK); |
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gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0); |
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} |
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return 0; |
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} |
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static int tps65132_regulator_is_enabled(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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struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
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if (!IS_ERR(rpdata->en_gpiod)) |
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return rpdata->ena_gpio_state; |
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return 1; |
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} |
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static const struct regulator_ops tps65132_regulator_ops = { |
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.enable = tps65132_regulator_enable, |
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.disable = tps65132_regulator_disable, |
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.is_enabled = tps65132_regulator_is_enabled, |
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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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.set_active_discharge = regulator_set_active_discharge_regmap, |
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}; |
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static int tps65132_of_parse_cb(struct device_node *np, |
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const struct regulator_desc *desc, |
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struct regulator_config *config) |
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{ |
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struct tps65132_regulator *tps = config->driver_data; |
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struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id]; |
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int ret; |
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rpdata->en_gpiod = devm_fwnode_gpiod_get(tps->dev, of_fwnode_handle(np), |
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"enable", GPIOD_ASIS, |
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"enable"); |
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if (IS_ERR(rpdata->en_gpiod)) { |
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ret = PTR_ERR(rpdata->en_gpiod); |
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/* Ignore the error other than probe defer */ |
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if (ret == -EPROBE_DEFER) |
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return ret; |
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return 0; |
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} |
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rpdata->act_dis_gpiod = devm_fwnode_gpiod_get(tps->dev, |
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of_fwnode_handle(np), |
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"active-discharge", |
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GPIOD_ASIS, |
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"active-discharge"); |
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if (IS_ERR(rpdata->act_dis_gpiod)) { |
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ret = PTR_ERR(rpdata->act_dis_gpiod); |
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/* Ignore the error other than probe defer */ |
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if (ret == -EPROBE_DEFER) |
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return ret; |
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return 0; |
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} |
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ret = of_property_read_u32(np, "ti,active-discharge-time-us", |
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&rpdata->act_dis_time_us); |
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if (ret < 0) { |
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dev_err(tps->dev, "Failed to read active discharge time:%d\n", |
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ret); |
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return ret; |
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} |
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return 0; |
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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-"#_name, \ |
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.supply_name = "vin", \ |
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.id = TPS65132_REGULATOR_ID_##_id, \ |
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.of_match = of_match_ptr(#_name), \ |
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.of_parse_cb = tps65132_of_parse_cb, \ |
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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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.active_discharge_off = 0, \ |
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.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \ |
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.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \ |
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.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.owner = THIS_MODULE, \ |
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} |
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static const struct regulator_desc tps_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 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, |
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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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{ |
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struct device *dev = &client->dev; |
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struct tps65132_regulator *tps; |
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struct regulator_dev *rdev; |
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struct regmap *rmap; |
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struct regulator_config config = { }; |
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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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return -ENOMEM; |
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rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config); |
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if (IS_ERR(rmap)) { |
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ret = PTR_ERR(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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config.regmap = rmap; |
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config.dev = dev; |
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config.driver_data = tps; |
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rdev = devm_regulator_register(dev, &tps_regs_desc[id], |
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&config); |
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if (IS_ERR(rdev)) { |
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ret = PTR_ERR(rdev); |
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dev_err(dev, "regulator %s register failed: %d\n", |
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tps_regs_desc[id].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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}, |
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.probe_new = tps65132_probe, |
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.id_table = tps65132_id, |
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}; |
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module_i2c_driver(tps65132_i2c_driver); |
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MODULE_DESCRIPTION("tps65132 regulator driver"); |
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MODULE_AUTHOR("Venkat Reddy Talla <[email protected]>"); |
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MODULE_AUTHOR("Laxman Dewangan <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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