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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * TI LMU (Lighting Management Unit) Core Driver4 *5 * Copyright 2017 Texas Instruments6 *7 * Author: Milo Kim <milo.kim@ti.com>8 */9 10#include <linux/delay.h>11#include <linux/err.h>12#include <linux/gpio/consumer.h>13#include <linux/i2c.h>14#include <linux/kernel.h>15#include <linux/mfd/core.h>16#include <linux/mfd/ti-lmu.h>17#include <linux/mfd/ti-lmu-register.h>18#include <linux/module.h>19#include <linux/of.h>20#include <linux/slab.h>21 22struct ti_lmu_data {23 const struct mfd_cell *cells;24 int num_cells;25 unsigned int max_register;26};27 28static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)29{30 if (lmu->en_gpio)31 gpiod_set_value(lmu->en_gpio, 1);32 33 /* Delay about 1ms after HW enable pin control */34 usleep_range(1000, 1500);35 36 /* LM3631 has additional power up sequence - enable LCD_EN bit. */37 if (id == LM3631) {38 return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,39 LM3631_LCD_EN_MASK,40 LM3631_LCD_EN_MASK);41 }42 43 return 0;44}45 46static void ti_lmu_disable_hw(void *data)47{48 struct ti_lmu *lmu = data;49 if (lmu->en_gpio)50 gpiod_set_value(lmu->en_gpio, 0);51}52 53#define LM363X_REGULATOR(_id) \54{ \55 .name = "lm363x-regulator", \56 .id = _id, \57 .of_compatible = "ti,lm363x-regulator", \58} \59 60static const struct mfd_cell lm3631_devices[] = {61 LM363X_REGULATOR(LM3631_BOOST),62 LM363X_REGULATOR(LM3631_LDO_CONT),63 LM363X_REGULATOR(LM3631_LDO_OREF),64 LM363X_REGULATOR(LM3631_LDO_POS),65 LM363X_REGULATOR(LM3631_LDO_NEG),66 {67 .name = "ti-lmu-backlight",68 .id = LM3631,69 .of_compatible = "ti,lm3631-backlight",70 },71};72 73static const struct mfd_cell lm3632_devices[] = {74 LM363X_REGULATOR(LM3632_BOOST),75 LM363X_REGULATOR(LM3632_LDO_POS),76 LM363X_REGULATOR(LM3632_LDO_NEG),77 {78 .name = "ti-lmu-backlight",79 .id = LM3632,80 .of_compatible = "ti,lm3632-backlight",81 },82};83 84static const struct mfd_cell lm3633_devices[] = {85 {86 .name = "ti-lmu-backlight",87 .id = LM3633,88 .of_compatible = "ti,lm3633-backlight",89 },90 {91 .name = "lm3633-leds",92 .of_compatible = "ti,lm3633-leds",93 },94 /* Monitoring driver for open/short circuit detection */95 {96 .name = "ti-lmu-fault-monitor",97 .id = LM3633,98 .of_compatible = "ti,lm3633-fault-monitor",99 },100};101 102static const struct mfd_cell lm3695_devices[] = {103 {104 .name = "ti-lmu-backlight",105 .id = LM3695,106 .of_compatible = "ti,lm3695-backlight",107 },108};109 110static const struct mfd_cell lm36274_devices[] = {111 LM363X_REGULATOR(LM36274_BOOST),112 LM363X_REGULATOR(LM36274_LDO_POS),113 LM363X_REGULATOR(LM36274_LDO_NEG),114 {115 .name = "lm36274-leds",116 .id = LM36274,117 .of_compatible = "ti,lm36274-backlight",118 },119};120 121#define TI_LMU_DATA(chip, max_reg) \122static const struct ti_lmu_data chip##_data = \123{ \124 .cells = chip##_devices, \125 .num_cells = ARRAY_SIZE(chip##_devices),\126 .max_register = max_reg, \127} \128 129TI_LMU_DATA(lm3631, LM3631_MAX_REG);130TI_LMU_DATA(lm3632, LM3632_MAX_REG);131TI_LMU_DATA(lm3633, LM3633_MAX_REG);132TI_LMU_DATA(lm3695, LM3695_MAX_REG);133TI_LMU_DATA(lm36274, LM36274_MAX_REG);134 135static int ti_lmu_probe(struct i2c_client *cl)136{137 const struct i2c_device_id *id = i2c_client_get_device_id(cl);138 struct device *dev = &cl->dev;139 const struct ti_lmu_data *data;140 struct regmap_config regmap_cfg;141 struct ti_lmu *lmu;142 int ret;143 144 /*145 * Get device specific data from of_match table.146 * This data is defined by using TI_LMU_DATA() macro.147 */148 data = of_device_get_match_data(dev);149 if (!data)150 return -ENODEV;151 152 lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);153 if (!lmu)154 return -ENOMEM;155 156 lmu->dev = &cl->dev;157 158 /* Setup regmap */159 memset(®map_cfg, 0, sizeof(struct regmap_config));160 regmap_cfg.reg_bits = 8;161 regmap_cfg.val_bits = 8;162 regmap_cfg.name = id->name;163 regmap_cfg.max_register = data->max_register;164 165 lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);166 if (IS_ERR(lmu->regmap))167 return PTR_ERR(lmu->regmap);168 169 /* HW enable pin control and additional power up sequence if required */170 lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);171 if (IS_ERR(lmu->en_gpio)) {172 ret = PTR_ERR(lmu->en_gpio);173 dev_err(dev, "Can not request enable GPIO: %d\n", ret);174 return ret;175 }176 177 ret = ti_lmu_enable_hw(lmu, id->driver_data);178 if (ret)179 return ret;180 181 ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);182 if (ret)183 return ret;184 185 /*186 * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.187 * After fault detection is done, some devices should re-initialize188 * configuration. The notifier enables such kind of handling.189 */190 BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);191 192 i2c_set_clientdata(cl, lmu);193 194 return devm_mfd_add_devices(lmu->dev, 0, data->cells,195 data->num_cells, NULL, 0, NULL);196}197 198static const struct of_device_id ti_lmu_of_match[] = {199 { .compatible = "ti,lm3631", .data = &lm3631_data },200 { .compatible = "ti,lm3632", .data = &lm3632_data },201 { .compatible = "ti,lm3633", .data = &lm3633_data },202 { .compatible = "ti,lm3695", .data = &lm3695_data },203 { .compatible = "ti,lm36274", .data = &lm36274_data },204 { }205};206MODULE_DEVICE_TABLE(of, ti_lmu_of_match);207 208static const struct i2c_device_id ti_lmu_ids[] = {209 { "lm3631", LM3631 },210 { "lm3632", LM3632 },211 { "lm3633", LM3633 },212 { "lm3695", LM3695 },213 { "lm36274", LM36274 },214 { }215};216MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);217 218static struct i2c_driver ti_lmu_driver = {219 .probe = ti_lmu_probe,220 .driver = {221 .name = "ti-lmu",222 .of_match_table = ti_lmu_of_match,223 },224 .id_table = ti_lmu_ids,225};226 227module_i2c_driver(ti_lmu_driver);228 229MODULE_DESCRIPTION("TI LMU MFD Core Driver");230MODULE_AUTHOR("Milo Kim");231MODULE_LICENSE("GPL v2");232