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