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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * TI LMU (Lighting Management Unit) Core Driver
- *
- * Copyright 2017 Texas Instruments
- *
- * Author: Milo Kim <[email protected]>
- */
- #include <linux/delay.h>
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/i2c.h>
- #include <linux/kernel.h>
- #include <linux/mfd/core.h>
- #include <linux/mfd/ti-lmu.h>
- #include <linux/mfd/ti-lmu-register.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_device.h>
- #include <linux/slab.h>
- struct ti_lmu_data {
- const struct mfd_cell *cells;
- int num_cells;
- unsigned int max_register;
- };
- static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
- {
- if (lmu->en_gpio)
- gpiod_set_value(lmu->en_gpio, 1);
- /* Delay about 1ms after HW enable pin control */
- usleep_range(1000, 1500);
- /* LM3631 has additional power up sequence - enable LCD_EN bit. */
- if (id == LM3631) {
- return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
- LM3631_LCD_EN_MASK,
- LM3631_LCD_EN_MASK);
- }
- return 0;
- }
- static void ti_lmu_disable_hw(void *data)
- {
- struct ti_lmu *lmu = data;
- if (lmu->en_gpio)
- gpiod_set_value(lmu->en_gpio, 0);
- }
- #define LM363X_REGULATOR(_id) \
- { \
- .name = "lm363x-regulator", \
- .id = _id, \
- .of_compatible = "ti,lm363x-regulator", \
- } \
- static const struct mfd_cell lm3631_devices[] = {
- LM363X_REGULATOR(LM3631_BOOST),
- LM363X_REGULATOR(LM3631_LDO_CONT),
- LM363X_REGULATOR(LM3631_LDO_OREF),
- LM363X_REGULATOR(LM3631_LDO_POS),
- LM363X_REGULATOR(LM3631_LDO_NEG),
- {
- .name = "ti-lmu-backlight",
- .id = LM3631,
- .of_compatible = "ti,lm3631-backlight",
- },
- };
- static const struct mfd_cell lm3632_devices[] = {
- LM363X_REGULATOR(LM3632_BOOST),
- LM363X_REGULATOR(LM3632_LDO_POS),
- LM363X_REGULATOR(LM3632_LDO_NEG),
- {
- .name = "ti-lmu-backlight",
- .id = LM3632,
- .of_compatible = "ti,lm3632-backlight",
- },
- };
- static const struct mfd_cell lm3633_devices[] = {
- {
- .name = "ti-lmu-backlight",
- .id = LM3633,
- .of_compatible = "ti,lm3633-backlight",
- },
- {
- .name = "lm3633-leds",
- .of_compatible = "ti,lm3633-leds",
- },
- /* Monitoring driver for open/short circuit detection */
- {
- .name = "ti-lmu-fault-monitor",
- .id = LM3633,
- .of_compatible = "ti,lm3633-fault-monitor",
- },
- };
- static const struct mfd_cell lm3695_devices[] = {
- {
- .name = "ti-lmu-backlight",
- .id = LM3695,
- .of_compatible = "ti,lm3695-backlight",
- },
- };
- static const struct mfd_cell lm36274_devices[] = {
- LM363X_REGULATOR(LM36274_BOOST),
- LM363X_REGULATOR(LM36274_LDO_POS),
- LM363X_REGULATOR(LM36274_LDO_NEG),
- {
- .name = "lm36274-leds",
- .id = LM36274,
- .of_compatible = "ti,lm36274-backlight",
- },
- };
- #define TI_LMU_DATA(chip, max_reg) \
- static const struct ti_lmu_data chip##_data = \
- { \
- .cells = chip##_devices, \
- .num_cells = ARRAY_SIZE(chip##_devices),\
- .max_register = max_reg, \
- } \
- TI_LMU_DATA(lm3631, LM3631_MAX_REG);
- TI_LMU_DATA(lm3632, LM3632_MAX_REG);
- TI_LMU_DATA(lm3633, LM3633_MAX_REG);
- TI_LMU_DATA(lm3695, LM3695_MAX_REG);
- TI_LMU_DATA(lm36274, LM36274_MAX_REG);
- static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
- {
- struct device *dev = &cl->dev;
- const struct ti_lmu_data *data;
- struct regmap_config regmap_cfg;
- struct ti_lmu *lmu;
- int ret;
- /*
- * Get device specific data from of_match table.
- * This data is defined by using TI_LMU_DATA() macro.
- */
- data = of_device_get_match_data(dev);
- if (!data)
- return -ENODEV;
- lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
- if (!lmu)
- return -ENOMEM;
- lmu->dev = &cl->dev;
- /* Setup regmap */
- memset(®map_cfg, 0, sizeof(struct regmap_config));
- regmap_cfg.reg_bits = 8;
- regmap_cfg.val_bits = 8;
- regmap_cfg.name = id->name;
- regmap_cfg.max_register = data->max_register;
- lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
- if (IS_ERR(lmu->regmap))
- return PTR_ERR(lmu->regmap);
- /* HW enable pin control and additional power up sequence if required */
- lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
- if (IS_ERR(lmu->en_gpio)) {
- ret = PTR_ERR(lmu->en_gpio);
- dev_err(dev, "Can not request enable GPIO: %d\n", ret);
- return ret;
- }
- ret = ti_lmu_enable_hw(lmu, id->driver_data);
- if (ret)
- return ret;
- ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
- if (ret)
- return ret;
- /*
- * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
- * After fault detection is done, some devices should re-initialize
- * configuration. The notifier enables such kind of handling.
- */
- BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
- i2c_set_clientdata(cl, lmu);
- return devm_mfd_add_devices(lmu->dev, 0, data->cells,
- data->num_cells, NULL, 0, NULL);
- }
- static const struct of_device_id ti_lmu_of_match[] = {
- { .compatible = "ti,lm3631", .data = &lm3631_data },
- { .compatible = "ti,lm3632", .data = &lm3632_data },
- { .compatible = "ti,lm3633", .data = &lm3633_data },
- { .compatible = "ti,lm3695", .data = &lm3695_data },
- { .compatible = "ti,lm36274", .data = &lm36274_data },
- { }
- };
- MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
- static const struct i2c_device_id ti_lmu_ids[] = {
- { "lm3631", LM3631 },
- { "lm3632", LM3632 },
- { "lm3633", LM3633 },
- { "lm3695", LM3695 },
- { "lm36274", LM36274 },
- { }
- };
- MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
- static struct i2c_driver ti_lmu_driver = {
- .probe = ti_lmu_probe,
- .driver = {
- .name = "ti-lmu",
- .of_match_table = ti_lmu_of_match,
- },
- .id_table = ti_lmu_ids,
- };
- module_i2c_driver(ti_lmu_driver);
- MODULE_DESCRIPTION("TI LMU MFD Core Driver");
- MODULE_AUTHOR("Milo Kim");
- MODULE_LICENSE("GPL v2");
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