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Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
427 lines
10 KiB
C
427 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip
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* Copyright (C) 2012 Texas Instruments
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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#include <linux/platform_data/lm3639_bl.h>
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#define REG_DEV_ID 0x00
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#define REG_CHECKSUM 0x01
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#define REG_BL_CONF_1 0x02
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#define REG_BL_CONF_2 0x03
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#define REG_BL_CONF_3 0x04
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#define REG_BL_CONF_4 0x05
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#define REG_FL_CONF_1 0x06
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#define REG_FL_CONF_2 0x07
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#define REG_FL_CONF_3 0x08
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#define REG_IO_CTRL 0x09
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#define REG_ENABLE 0x0A
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#define REG_FLAG 0x0B
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#define REG_MAX REG_FLAG
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struct lm3639_chip_data {
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struct device *dev;
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struct lm3639_platform_data *pdata;
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struct backlight_device *bled;
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struct led_classdev cdev_flash;
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struct led_classdev cdev_torch;
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struct regmap *regmap;
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unsigned int bled_mode;
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unsigned int bled_map;
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unsigned int last_flag;
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};
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/* initialize chip */
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static int lm3639_chip_init(struct lm3639_chip_data *pchip)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_platform_data *pdata = pchip->pdata;
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/* input pins config. */
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
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pdata->pin_pwm);
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if (ret < 0)
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goto out;
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reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
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ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
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if (ret < 0)
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goto out;
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/* init brightness */
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ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
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if (ret < 0)
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goto out;
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ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
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if (ret < 0)
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goto out;
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/* output pins config. */
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if (!pdata->init_brt_led) {
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reg_val = pdata->fled_pins;
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reg_val |= pdata->bled_pins;
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} else {
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reg_val = pdata->fled_pins;
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reg_val |= pdata->bled_pins | 0x01;
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}
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
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if (ret < 0)
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goto out;
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return ret;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return ret;
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}
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/* update and get brightness */
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static int lm3639_bled_update_status(struct backlight_device *bl)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip = bl_get_data(bl);
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struct lm3639_platform_data *pdata = pchip->pdata;
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* pwm control */
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if (pdata->pin_pwm) {
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if (pdata->pwm_set_intensity)
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pdata->pwm_set_intensity(bl->props.brightness,
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pdata->max_brt_led);
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else
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dev_err(pchip->dev,
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"No pwm control func. in plat-data\n");
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return bl->props.brightness;
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}
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/* i2c control and set brigtness */
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ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
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if (ret < 0)
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goto out;
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ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
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if (ret < 0)
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goto out;
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if (!bl->props.brightness)
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
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else
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
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if (ret < 0)
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goto out;
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return bl->props.brightness;
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out:
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dev_err(pchip->dev, "i2c failed to access registers\n");
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return bl->props.brightness;
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}
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static int lm3639_bled_get_brightness(struct backlight_device *bl)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip = bl_get_data(bl);
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struct lm3639_platform_data *pdata = pchip->pdata;
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if (pdata->pin_pwm) {
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if (pdata->pwm_get_intensity)
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bl->props.brightness = pdata->pwm_get_intensity();
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else
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dev_err(pchip->dev,
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"No pwm control func. in plat-data\n");
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return bl->props.brightness;
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}
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ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val & 0x10)
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ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val);
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else
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ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val);
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if (ret < 0)
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goto out;
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bl->props.brightness = reg_val;
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return bl->props.brightness;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return bl->props.brightness;
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}
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static const struct backlight_ops lm3639_bled_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lm3639_bled_update_status,
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.get_brightness = lm3639_bled_get_brightness,
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};
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/* backlight mapping mode */
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static ssize_t lm3639_bled_mode_store(struct device *dev,
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struct device_attribute *devAttr,
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const char *buf, size_t size)
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{
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ssize_t ret;
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struct lm3639_chip_data *pchip = dev_get_drvdata(dev);
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unsigned int state;
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ret = kstrtouint(buf, 10, &state);
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if (ret)
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goto out_input;
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if (!state)
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
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0x00);
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else
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
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0x10);
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if (ret < 0)
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goto out;
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return size;
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out:
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dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);
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return ret;
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out_input:
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dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
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return ret;
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}
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static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store);
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/* torch */
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static void lm3639_torch_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip;
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pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* brightness 0 means off state */
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if (!brightness) {
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
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if (ret < 0)
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goto out;
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return;
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}
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ret = regmap_update_bits(pchip->regmap,
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REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
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if (ret < 0)
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goto out;
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return;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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}
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/* flash */
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static void lm3639_flash_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip;
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pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* torch off before flash control */
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
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if (ret < 0)
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goto out;
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/* brightness 0 means off state */
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if (!brightness)
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return;
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ret = regmap_update_bits(pchip->regmap,
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REG_FL_CONF_1, 0x0F, brightness - 1);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
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if (ret < 0)
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goto out;
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return;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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}
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static const struct regmap_config lm3639_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_MAX,
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};
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static int lm3639_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct lm3639_chip_data *pchip;
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struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev);
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struct backlight_properties props;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "i2c functionality check fail.\n");
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return -EOPNOTSUPP;
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}
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if (pdata == NULL) {
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dev_err(&client->dev, "Needs Platform Data.\n");
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return -ENODATA;
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}
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pchip = devm_kzalloc(&client->dev,
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sizeof(struct lm3639_chip_data), GFP_KERNEL);
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if (!pchip)
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return -ENOMEM;
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pchip->pdata = pdata;
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pchip->dev = &client->dev;
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pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
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if (IS_ERR(pchip->regmap)) {
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ret = PTR_ERR(pchip->regmap);
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dev_err(&client->dev, "fail : allocate register map: %d\n",
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ret);
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return ret;
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}
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i2c_set_clientdata(client, pchip);
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/* chip initialize */
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ret = lm3639_chip_init(pchip);
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if (ret < 0) {
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dev_err(&client->dev, "fail : chip init\n");
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goto err_out;
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}
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/* backlight */
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props.type = BACKLIGHT_RAW;
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props.brightness = pdata->init_brt_led;
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props.max_brightness = pdata->max_brt_led;
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pchip->bled =
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devm_backlight_device_register(pchip->dev, "lm3639_bled",
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pchip->dev, pchip, &lm3639_bled_ops,
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&props);
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if (IS_ERR(pchip->bled)) {
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dev_err(&client->dev, "fail : backlight register\n");
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ret = PTR_ERR(pchip->bled);
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goto err_out;
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}
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ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
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if (ret < 0) {
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dev_err(&client->dev, "failed : add sysfs entries\n");
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goto err_out;
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}
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/* flash */
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pchip->cdev_flash.name = "lm3639_flash";
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pchip->cdev_flash.max_brightness = 16;
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pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
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ret = led_classdev_register((struct device *)
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&client->dev, &pchip->cdev_flash);
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if (ret < 0) {
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dev_err(&client->dev, "fail : flash register\n");
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goto err_flash;
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}
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/* torch */
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pchip->cdev_torch.name = "lm3639_torch";
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pchip->cdev_torch.max_brightness = 8;
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pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
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ret = led_classdev_register((struct device *)
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&client->dev, &pchip->cdev_torch);
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if (ret < 0) {
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dev_err(&client->dev, "fail : torch register\n");
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goto err_torch;
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}
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return 0;
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err_torch:
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led_classdev_unregister(&pchip->cdev_flash);
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err_flash:
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device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
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err_out:
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return ret;
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}
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static int lm3639_remove(struct i2c_client *client)
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{
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struct lm3639_chip_data *pchip = i2c_get_clientdata(client);
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regmap_write(pchip->regmap, REG_ENABLE, 0x00);
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led_classdev_unregister(&pchip->cdev_torch);
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led_classdev_unregister(&pchip->cdev_flash);
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if (pchip->bled)
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device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
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return 0;
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}
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static const struct i2c_device_id lm3639_id[] = {
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{LM3639_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lm3639_id);
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static struct i2c_driver lm3639_i2c_driver = {
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.driver = {
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.name = LM3639_NAME,
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},
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.probe = lm3639_probe,
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.remove = lm3639_remove,
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.id_table = lm3639_id,
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};
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module_i2c_driver(lm3639_i2c_driver);
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MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
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MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
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MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
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MODULE_LICENSE("GPL v2");
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