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5a429bdd6f
There is no need to return -EIO, because backlight_device_register() already returns correct error values. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Daniel Jeong <daniel.jeong@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
475 lines
12 KiB
C
475 lines
12 KiB
C
/*
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* Simple driver for Texas Instruments LM3630 Backlight driver chip
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* Copyright (C) 2012 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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/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/lm3630_bl.h>
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#define REG_CTRL 0x00
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#define REG_CONFIG 0x01
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#define REG_BRT_A 0x03
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#define REG_BRT_B 0x04
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#define REG_INT_STATUS 0x09
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#define REG_INT_EN 0x0A
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#define REG_FAULT 0x0B
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#define REG_PWM_OUTLOW 0x12
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#define REG_PWM_OUTHIGH 0x13
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#define REG_MAX 0x1F
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#define INT_DEBOUNCE_MSEC 10
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enum lm3630_leds {
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BLED_ALL = 0,
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BLED_1,
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BLED_2
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};
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static const char * const bled_name[] = {
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[BLED_ALL] = "lm3630_bled", /*Bank1 controls all string */
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[BLED_1] = "lm3630_bled1", /*Bank1 controls bled1 */
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[BLED_2] = "lm3630_bled2", /*Bank1 or 2 controls bled2 */
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};
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struct lm3630_chip_data {
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struct device *dev;
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struct delayed_work work;
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int irq;
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struct workqueue_struct *irqthread;
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struct lm3630_platform_data *pdata;
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struct backlight_device *bled1;
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struct backlight_device *bled2;
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struct regmap *regmap;
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};
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/* initialize chip */
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static int lm3630_chip_init(struct lm3630_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 lm3630_platform_data *pdata = pchip->pdata;
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/*pwm control */
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reg_val = ((pdata->pwm_active & 0x01) << 2) | (pdata->pwm_ctrl & 0x03);
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ret = regmap_update_bits(pchip->regmap, REG_CONFIG, 0x07, reg_val);
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if (ret < 0)
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goto out;
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/* bank control */
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reg_val = ((pdata->bank_b_ctrl & 0x01) << 1) |
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(pdata->bank_a_ctrl & 0x07);
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x07, reg_val);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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/* set initial brightness */
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if (pdata->bank_a_ctrl != BANK_A_CTRL_DISABLE) {
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ret = regmap_write(pchip->regmap,
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REG_BRT_A, pdata->init_brt_led1);
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if (ret < 0)
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goto out;
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}
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if (pdata->bank_b_ctrl != BANK_B_CTRL_DISABLE) {
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ret = regmap_write(pchip->regmap,
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REG_BRT_B, pdata->init_brt_led2);
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if (ret < 0)
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goto out;
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}
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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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/* interrupt handling */
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static void lm3630_delayed_func(struct work_struct *work)
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{
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int ret;
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unsigned int reg_val;
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struct lm3630_chip_data *pchip;
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pchip = container_of(work, struct lm3630_chip_data, work.work);
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ret = regmap_read(pchip->regmap, REG_INT_STATUS, ®_val);
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if (ret < 0) {
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dev_err(pchip->dev,
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"i2c failed to access REG_INT_STATUS Register\n");
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return;
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}
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dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", reg_val);
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}
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static irqreturn_t lm3630_isr_func(int irq, void *chip)
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{
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int ret;
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struct lm3630_chip_data *pchip = chip;
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unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
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queue_delayed_work(pchip->irqthread, &pchip->work, delay);
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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return IRQ_HANDLED;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return IRQ_HANDLED;
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}
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static int lm3630_intr_config(struct lm3630_chip_data *pchip)
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{
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INIT_DELAYED_WORK(&pchip->work, lm3630_delayed_func);
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pchip->irqthread = create_singlethread_workqueue("lm3630-irqthd");
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if (!pchip->irqthread) {
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dev_err(pchip->dev, "create irq thread fail...\n");
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return -1;
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}
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if (request_threaded_irq
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(pchip->irq, NULL, lm3630_isr_func,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630_irq", pchip)) {
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dev_err(pchip->dev, "request threaded irq fail..\n");
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return -1;
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}
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return 0;
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}
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static bool
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set_intensity(struct backlight_device *bl, struct lm3630_chip_data *pchip)
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{
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if (!pchip->pdata->pwm_set_intensity)
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return false;
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pchip->pdata->pwm_set_intensity(bl->props.brightness - 1,
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pchip->pdata->pwm_period);
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return true;
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}
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/* update and get brightness */
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static int lm3630_bank_a_update_status(struct backlight_device *bl)
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{
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int ret;
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struct lm3630_chip_data *pchip = bl_get_data(bl);
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enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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/* brightness 0 means disable */
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if (!bl->props.brightness) {
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x04, 0x00);
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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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}
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/* pwm control */
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if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) {
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if (!set_intensity(bl, pchip))
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dev_err(pchip->dev, "No pwm control func. in plat-data\n");
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} else {
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/* i2c control */
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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mdelay(1);
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ret = regmap_write(pchip->regmap,
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REG_BRT_A, bl->props.brightness - 1);
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if (ret < 0)
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goto out;
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}
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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 REG_CTRL\n");
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return bl->props.brightness;
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}
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static int lm3630_bank_a_get_brightness(struct backlight_device *bl)
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{
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unsigned int reg_val;
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int brightness, ret;
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struct lm3630_chip_data *pchip = bl_get_data(bl);
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enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) {
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ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, ®_val);
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if (ret < 0)
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goto out;
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brightness = reg_val & 0x01;
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ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_val);
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if (ret < 0)
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goto out;
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brightness = ((brightness << 8) | reg_val) + 1;
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} else {
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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mdelay(1);
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ret = regmap_read(pchip->regmap, REG_BRT_A, ®_val);
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if (ret < 0)
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goto out;
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brightness = reg_val + 1;
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}
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bl->props.brightness = brightness;
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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 0;
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}
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static const struct backlight_ops lm3630_bank_a_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lm3630_bank_a_update_status,
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.get_brightness = lm3630_bank_a_get_brightness,
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};
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static int lm3630_bank_b_update_status(struct backlight_device *bl)
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{
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int ret;
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struct lm3630_chip_data *pchip = bl_get_data(bl);
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enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) {
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if (!set_intensity(bl, pchip))
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dev_err(pchip->dev,
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"no pwm control func. in plat-data\n");
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} else {
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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mdelay(1);
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ret = regmap_write(pchip->regmap,
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REG_BRT_B, bl->props.brightness - 1);
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}
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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 int lm3630_bank_b_get_brightness(struct backlight_device *bl)
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{
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unsigned int reg_val;
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int brightness, ret;
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struct lm3630_chip_data *pchip = bl_get_data(bl);
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enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) {
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ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, ®_val);
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if (ret < 0)
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goto out;
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brightness = reg_val & 0x01;
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ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_val);
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if (ret < 0)
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goto out;
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brightness = ((brightness << 8) | reg_val) + 1;
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} else {
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ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
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if (ret < 0)
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goto out;
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mdelay(1);
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ret = regmap_read(pchip->regmap, REG_BRT_B, ®_val);
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if (ret < 0)
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goto out;
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brightness = reg_val + 1;
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}
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bl->props.brightness = brightness;
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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 lm3630_bank_b_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lm3630_bank_b_update_status,
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.get_brightness = lm3630_bank_b_get_brightness,
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};
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static int lm3630_backlight_register(struct lm3630_chip_data *pchip,
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enum lm3630_leds ledno)
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{
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const char *name = bled_name[ledno];
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struct backlight_properties props;
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struct lm3630_platform_data *pdata = pchip->pdata;
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props.type = BACKLIGHT_RAW;
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switch (ledno) {
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case BLED_1:
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case BLED_ALL:
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props.brightness = pdata->init_brt_led1;
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props.max_brightness = pdata->max_brt_led1;
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pchip->bled1 =
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backlight_device_register(name, pchip->dev, pchip,
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&lm3630_bank_a_ops, &props);
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if (IS_ERR(pchip->bled1))
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return PTR_ERR(pchip->bled1);
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break;
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case BLED_2:
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props.brightness = pdata->init_brt_led2;
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props.max_brightness = pdata->max_brt_led2;
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pchip->bled2 =
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backlight_device_register(name, pchip->dev, pchip,
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&lm3630_bank_b_ops, &props);
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if (IS_ERR(pchip->bled2))
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return PTR_ERR(pchip->bled2);
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break;
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}
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return 0;
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}
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static void lm3630_backlight_unregister(struct lm3630_chip_data *pchip)
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{
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if (pchip->bled1)
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backlight_device_unregister(pchip->bled1);
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if (pchip->bled2)
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backlight_device_unregister(pchip->bled2);
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}
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static const struct regmap_config lm3630_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 lm3630_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3630_platform_data *pdata = client->dev.platform_data;
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struct lm3630_chip_data *pchip;
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "fail : i2c functionality check...\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, "fail : no platform data.\n");
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return -ENODATA;
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}
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pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630_chip_data),
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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, &lm3630_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 = lm3630_chip_init(pchip);
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if (ret < 0) {
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dev_err(&client->dev, "fail : init chip\n");
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goto err_chip_init;
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}
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switch (pdata->bank_a_ctrl) {
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case BANK_A_CTRL_ALL:
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ret = lm3630_backlight_register(pchip, BLED_ALL);
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pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE;
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break;
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case BANK_A_CTRL_LED1:
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ret = lm3630_backlight_register(pchip, BLED_1);
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break;
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case BANK_A_CTRL_LED2:
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ret = lm3630_backlight_register(pchip, BLED_2);
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pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE;
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break;
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default:
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break;
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}
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if (ret < 0)
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goto err_bl_reg;
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if (pdata->bank_b_ctrl && pchip->bled2 == NULL) {
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ret = lm3630_backlight_register(pchip, BLED_2);
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if (ret < 0)
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goto err_bl_reg;
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}
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/* interrupt enable : irq 0 is not allowed for lm3630 */
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pchip->irq = client->irq;
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if (pchip->irq)
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lm3630_intr_config(pchip);
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dev_info(&client->dev, "LM3630 backlight register OK.\n");
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return 0;
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err_bl_reg:
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dev_err(&client->dev, "fail : backlight register.\n");
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lm3630_backlight_unregister(pchip);
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err_chip_init:
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return ret;
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}
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static int lm3630_remove(struct i2c_client *client)
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{
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int ret;
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struct lm3630_chip_data *pchip = i2c_get_clientdata(client);
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ret = regmap_write(pchip->regmap, REG_BRT_A, 0);
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if (ret < 0)
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dev_err(pchip->dev, "i2c failed to access register\n");
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ret = regmap_write(pchip->regmap, REG_BRT_B, 0);
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if (ret < 0)
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dev_err(pchip->dev, "i2c failed to access register\n");
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lm3630_backlight_unregister(pchip);
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if (pchip->irq) {
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free_irq(pchip->irq, pchip);
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flush_workqueue(pchip->irqthread);
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destroy_workqueue(pchip->irqthread);
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}
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return 0;
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}
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static const struct i2c_device_id lm3630_id[] = {
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{LM3630_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lm3630_id);
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static struct i2c_driver lm3630_i2c_driver = {
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.driver = {
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.name = LM3630_NAME,
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},
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.probe = lm3630_probe,
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.remove = lm3630_remove,
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.id_table = lm3630_id,
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};
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module_i2c_driver(lm3630_i2c_driver);
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MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630");
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MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
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MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
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MODULE_LICENSE("GPL v2");
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