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155 lines
4.0 KiB
155 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI/National Semiconductor LP3943 MFD Core Driver |
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* |
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* Copyright 2013 Texas Instruments |
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* |
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* Author: Milo Kim <[email protected]> |
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* |
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* Driver structure: |
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* LP3943 is an integrated device capable of driving 16 output channels. |
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* It can be used for a GPIO expander and PWM generators. |
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* |
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* LED control General usage for a device |
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* ___________ ____________________________ |
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* |
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* LP3943 MFD ---- GPIO expander leds-gpio eg) HW enable pin |
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* | |
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* --- PWM generator leds-pwm eg) PWM input |
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* |
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* Internal two PWM channels are used for LED dimming effect. |
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* And each output pin can be used as a GPIO as well. |
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* The LED functionality can work with GPIOs or PWMs. |
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* LEDs can be controlled with legacy leds-gpio(static brightness) or |
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* leds-pwm drivers(dynamic brightness control). |
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* Alternatively, it can be used for generic GPIO and PWM controller. |
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* For example, a GPIO is HW enable pin of a device. |
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* A PWM is input pin of a backlight device. |
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*/ |
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#include <linux/err.h> |
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#include <linux/gpio.h> |
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#include <linux/i2c.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/lp3943.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/slab.h> |
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#define LP3943_MAX_REGISTERS 0x09 |
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/* Register configuration for pin MUX */ |
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static const struct lp3943_reg_cfg lp3943_mux_cfg[] = { |
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/* address, mask, shift */ |
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{ LP3943_REG_MUX0, 0x03, 0 }, |
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{ LP3943_REG_MUX0, 0x0C, 2 }, |
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{ LP3943_REG_MUX0, 0x30, 4 }, |
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{ LP3943_REG_MUX0, 0xC0, 6 }, |
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{ LP3943_REG_MUX1, 0x03, 0 }, |
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{ LP3943_REG_MUX1, 0x0C, 2 }, |
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{ LP3943_REG_MUX1, 0x30, 4 }, |
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{ LP3943_REG_MUX1, 0xC0, 6 }, |
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{ LP3943_REG_MUX2, 0x03, 0 }, |
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{ LP3943_REG_MUX2, 0x0C, 2 }, |
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{ LP3943_REG_MUX2, 0x30, 4 }, |
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{ LP3943_REG_MUX2, 0xC0, 6 }, |
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{ LP3943_REG_MUX3, 0x03, 0 }, |
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{ LP3943_REG_MUX3, 0x0C, 2 }, |
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{ LP3943_REG_MUX3, 0x30, 4 }, |
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{ LP3943_REG_MUX3, 0xC0, 6 }, |
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}; |
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static const struct mfd_cell lp3943_devs[] = { |
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{ |
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.name = "lp3943-pwm", |
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.of_compatible = "ti,lp3943-pwm", |
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}, |
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{ |
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.name = "lp3943-gpio", |
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.of_compatible = "ti,lp3943-gpio", |
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}, |
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}; |
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int lp3943_read_byte(struct lp3943 *lp3943, u8 reg, u8 *read) |
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{ |
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int ret; |
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unsigned int val; |
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ret = regmap_read(lp3943->regmap, reg, &val); |
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if (ret < 0) |
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return ret; |
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*read = (u8)val; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(lp3943_read_byte); |
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int lp3943_write_byte(struct lp3943 *lp3943, u8 reg, u8 data) |
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{ |
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return regmap_write(lp3943->regmap, reg, data); |
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} |
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EXPORT_SYMBOL_GPL(lp3943_write_byte); |
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int lp3943_update_bits(struct lp3943 *lp3943, u8 reg, u8 mask, u8 data) |
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{ |
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return regmap_update_bits(lp3943->regmap, reg, mask, data); |
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} |
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EXPORT_SYMBOL_GPL(lp3943_update_bits); |
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static const struct regmap_config lp3943_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = LP3943_MAX_REGISTERS, |
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}; |
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static int lp3943_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
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{ |
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struct lp3943 *lp3943; |
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struct device *dev = &cl->dev; |
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lp3943 = devm_kzalloc(dev, sizeof(*lp3943), GFP_KERNEL); |
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if (!lp3943) |
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return -ENOMEM; |
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lp3943->regmap = devm_regmap_init_i2c(cl, &lp3943_regmap_config); |
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if (IS_ERR(lp3943->regmap)) |
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return PTR_ERR(lp3943->regmap); |
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lp3943->pdata = dev_get_platdata(dev); |
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lp3943->dev = dev; |
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lp3943->mux_cfg = lp3943_mux_cfg; |
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i2c_set_clientdata(cl, lp3943); |
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return devm_mfd_add_devices(dev, -1, lp3943_devs, |
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ARRAY_SIZE(lp3943_devs), |
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NULL, 0, NULL); |
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} |
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static const struct i2c_device_id lp3943_ids[] = { |
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{ "lp3943", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, lp3943_ids); |
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#ifdef CONFIG_OF |
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static const struct of_device_id lp3943_of_match[] = { |
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{ .compatible = "ti,lp3943", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, lp3943_of_match); |
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#endif |
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static struct i2c_driver lp3943_driver = { |
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.probe = lp3943_probe, |
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.driver = { |
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.name = "lp3943", |
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.of_match_table = of_match_ptr(lp3943_of_match), |
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}, |
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.id_table = lp3943_ids, |
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}; |
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module_i2c_driver(lp3943_driver); |
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MODULE_DESCRIPTION("LP3943 MFD Core Driver"); |
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MODULE_AUTHOR("Milo Kim"); |
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MODULE_LICENSE("GPL");
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