diff options
Diffstat (limited to 'drivers/mfd/ti-lmu.c')
| -rw-r--r-- | drivers/mfd/ti-lmu.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c new file mode 100644 index 0000000000..cfc9f88b98 --- /dev/null +++ b/drivers/mfd/ti-lmu.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * TI LMU (Lighting Management Unit) Core Driver + * + * Copyright 2017 Texas Instruments + * + * Author: Milo Kim <milo.kim@ti.com> + */ + +#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/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 = i2c_client_get_device_id(cl); + 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"); |