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@@ -0,0 +1,483 @@
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+/*
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+* Simple driver for Texas Instruments LM3630A 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/pwm.h>
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+#include <linux/platform_data/lm3630a_bl.h>
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+
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+#define REG_CTRL 0x00
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+#define REG_BOOST 0x02
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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_I_A 0x05
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+#define REG_I_B 0x06
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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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+
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+#define INT_DEBOUNCE_MSEC 10
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+struct lm3630a_chip {
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+ struct device *dev;
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+ struct delayed_work work;
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+
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+ int irq;
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+ struct workqueue_struct *irqthread;
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+ struct lm3630a_platform_data *pdata;
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+ struct backlight_device *bleda;
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+ struct backlight_device *bledb;
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+ struct regmap *regmap;
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+ struct pwm_device *pwmd;
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+};
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+
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+/* i2c access */
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+static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
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+{
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+ int rval;
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+ unsigned int reg_val;
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+
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+ rval = regmap_read(pchip->regmap, reg, ®_val);
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+ if (rval < 0)
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+ return rval;
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+ return reg_val & 0xFF;
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+}
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+
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+static int lm3630a_write(struct lm3630a_chip *pchip,
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+ unsigned int reg, unsigned int data)
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+{
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+ return regmap_write(pchip->regmap, reg, data);
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+}
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+
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+static int lm3630a_update(struct lm3630a_chip *pchip,
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+ unsigned int reg, unsigned int mask,
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+ unsigned int data)
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+{
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+ return regmap_update_bits(pchip->regmap, reg, mask, data);
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+}
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+
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+/* initialize chip */
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+static int lm3630a_chip_init(struct lm3630a_chip *pchip)
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+{
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+ int rval;
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+ struct lm3630a_platform_data *pdata = pchip->pdata;
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+
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+ usleep_range(1000, 2000);
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+ /* set Filter Strength Register */
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+ rval = lm3630a_write(pchip, 0x50, 0x03);
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+ /* set Cofig. register */
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+ rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
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+ /* set boost control */
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+ rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
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+ /* set current A */
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+ rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
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+ /* set current B */
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+ rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
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+ /* set control */
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+ rval |=
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+ lm3630a_write(pchip, REG_CTRL, pdata->leda_ctrl | pdata->ledb_ctrl);
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+ usleep_range(1000, 2000);
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+ /* set brightness A and B */
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+ rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
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+ rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
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+
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+ if (rval < 0)
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+ dev_err(pchip->dev, "i2c failed to access register\n");
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+ return rval;
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+}
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+
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+/* interrupt handling */
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+static void lm3630a_delayed_func(struct work_struct *work)
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+{
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+ unsigned int rval;
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+ struct lm3630a_chip *pchip;
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+
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+ pchip = container_of(work, struct lm3630a_chip, work.work);
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+
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+ rval = lm3630a_read(pchip, REG_INT_STATUS);
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+ if (rval < 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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+
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+ dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
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+}
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+
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+static irqreturn_t lm3630a_isr_func(int irq, void *chip)
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+{
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+ int rval;
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+ struct lm3630a_chip *pchip = chip;
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+ unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
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+
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+ queue_delayed_work(pchip->irqthread, &pchip->work, delay);
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+
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+ rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
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+ if (rval < 0) {
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+ dev_err(pchip->dev, "i2c failed to access register\n");
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+ return IRQ_NONE;
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+ }
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+ return IRQ_HANDLED;
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+}
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+
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+static int lm3630a_intr_config(struct lm3630a_chip *pchip)
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+{
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+ int rval;
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+
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+ rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
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+ if (rval < 0)
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+ return rval;
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+
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+ INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
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+ pchip->irqthread = create_singlethread_workqueue("lm3630a-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 -ENOMEM;
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+ }
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+ if (request_threaded_irq
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+ (pchip->irq, NULL, lm3630a_isr_func,
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+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
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+ dev_err(pchip->dev, "request threaded irq fail\n");
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+ return -ENOMEM;
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+ }
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+ return rval;
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+}
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+
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+static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
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+{
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+ unsigned int period = pwm_get_period(pchip->pwmd);
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+ unsigned int duty = br * period / br_max;
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+
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+ pwm_config(pchip->pwmd, duty, period);
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+ if (duty)
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+ pwm_enable(pchip->pwmd);
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+ else
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+ pwm_disable(pchip->pwmd);
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+}
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+
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+/* update and get brightness */
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+static int lm3630a_bank_a_update_status(struct backlight_device *bl)
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+{
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+ int ret;
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+ struct lm3630a_chip *pchip = bl_get_data(bl);
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+ enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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+
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+ /* pwm control */
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+ if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
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+ lm3630a_pwm_ctrl(pchip, bl->props.brightness,
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+ bl->props.max_brightness);
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+ return bl->props.brightness;
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+ }
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+
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+ /* disable sleep */
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+ ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
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+ if (ret < 0)
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+ goto out_i2c_err;
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+ usleep_range(1000, 2000);
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+ /* minimum brightness is 0x04 */
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+ ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
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+ if (bl->props.brightness < 0x4)
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+ ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
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+ else
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+ ret |= lm3630a_update(pchip, REG_CTRL,
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+ LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
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+ if (ret < 0)
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+ goto out_i2c_err;
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+ return bl->props.brightness;
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+
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+out_i2c_err:
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+ dev_err(pchip->dev, "i2c failed to access\n");
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+ return bl->props.brightness;
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+}
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+
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+static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
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+{
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+ int brightness, rval;
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+ struct lm3630a_chip *pchip = bl_get_data(bl);
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+ enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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+
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+ if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
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+ rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness = (rval & 0x01) << 8;
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+ rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness |= rval;
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+ goto out;
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+ }
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+
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+ /* disable sleep */
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+ rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ usleep_range(1000, 2000);
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+ rval = lm3630a_read(pchip, REG_BRT_A);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness = rval;
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+
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+out:
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+ bl->props.brightness = brightness;
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+ return bl->props.brightness;
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+out_i2c_err:
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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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+
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+static const struct backlight_ops lm3630a_bank_a_ops = {
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+ .options = BL_CORE_SUSPENDRESUME,
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+ .update_status = lm3630a_bank_a_update_status,
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+ .get_brightness = lm3630a_bank_a_get_brightness,
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+};
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+
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+/* update and get brightness */
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+static int lm3630a_bank_b_update_status(struct backlight_device *bl)
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+{
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+ int ret;
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+ struct lm3630a_chip *pchip = bl_get_data(bl);
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+ enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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+
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+ /* pwm control */
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+ if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
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+ lm3630a_pwm_ctrl(pchip, bl->props.brightness,
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+ bl->props.max_brightness);
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+ return bl->props.brightness;
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+ }
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+
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+ /* disable sleep */
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+ ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
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+ if (ret < 0)
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+ goto out_i2c_err;
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+ usleep_range(1000, 2000);
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+ /* minimum brightness is 0x04 */
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+ ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
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+ if (bl->props.brightness < 0x4)
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+ ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
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+ else
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+ ret |= lm3630a_update(pchip, REG_CTRL,
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+ LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
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+ if (ret < 0)
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+ goto out_i2c_err;
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+ return bl->props.brightness;
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+
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+out_i2c_err:
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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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+
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+static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
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+{
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+ int brightness, rval;
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+ struct lm3630a_chip *pchip = bl_get_data(bl);
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+ enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
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+
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+ if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
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+ rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness = (rval & 0x01) << 8;
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+ rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness |= rval;
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+ goto out;
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+ }
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+
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+ /* disable sleep */
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+ rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ usleep_range(1000, 2000);
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+ rval = lm3630a_read(pchip, REG_BRT_B);
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+ if (rval < 0)
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+ goto out_i2c_err;
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+ brightness = rval;
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+
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+out:
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+ bl->props.brightness = brightness;
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+ return bl->props.brightness;
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+out_i2c_err:
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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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+
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+static const struct backlight_ops lm3630a_bank_b_ops = {
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+ .options = BL_CORE_SUSPENDRESUME,
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+ .update_status = lm3630a_bank_b_update_status,
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+ .get_brightness = lm3630a_bank_b_get_brightness,
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+};
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+
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+static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
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+{
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+ struct backlight_properties props;
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+ struct lm3630a_platform_data *pdata = pchip->pdata;
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+
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+ props.type = BACKLIGHT_RAW;
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+ if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
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+ props.brightness = pdata->leda_init_brt;
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+ props.max_brightness = pdata->leda_max_brt;
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+ pchip->bleda =
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+ devm_backlight_device_register(pchip->dev, "lm3630a_leda",
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+ pchip->dev, pchip,
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+ &lm3630a_bank_a_ops, &props);
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+ if (IS_ERR(pchip->bleda))
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+ return PTR_ERR(pchip->bleda);
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+ }
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+
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+ if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
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+ (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
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+ props.brightness = pdata->ledb_init_brt;
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+ props.max_brightness = pdata->ledb_max_brt;
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+ pchip->bledb =
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+ devm_backlight_device_register(pchip->dev, "lm3630a_ledb",
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+ pchip->dev, pchip,
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+ &lm3630a_bank_b_ops, &props);
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+ if (IS_ERR(pchip->bledb))
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+ return PTR_ERR(pchip->bledb);
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+ }
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+ return 0;
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+}
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+
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+static const struct regmap_config lm3630a_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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+
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+static int lm3630a_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ struct lm3630a_platform_data *pdata = client->dev.platform_data;
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+ struct lm3630a_chip *pchip;
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+ int rval;
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+
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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");
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+ }
|
|
|
+
|
|
|
+ pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (!pchip)
|
|
|
+ return -ENOMEM;
|
|
|
+ pchip->dev = &client->dev;
|
|
|
+
|
|
|
+ pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
|
|
|
+ if (IS_ERR(pchip->regmap)) {
|
|
|
+ rval = PTR_ERR(pchip->regmap);
|
|
|
+ dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
|
|
|
+ return rval;
|
|
|
+ }
|
|
|
+
|
|
|
+ i2c_set_clientdata(client, pchip);
|
|
|
+ if (pdata == NULL) {
|
|
|
+ pchip->pdata = devm_kzalloc(pchip->dev,
|
|
|
+ sizeof(struct
|
|
|
+ lm3630a_platform_data),
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (pchip->pdata == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+ /* default values */
|
|
|
+ pchip->pdata->leda_ctrl = LM3630A_LEDA_ENABLE;
|
|
|
+ pchip->pdata->ledb_ctrl = LM3630A_LEDB_ENABLE;
|
|
|
+ pchip->pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
|
|
|
+ pchip->pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
|
|
|
+ pchip->pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
|
|
|
+ pchip->pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
|
|
|
+ } else {
|
|
|
+ pchip->pdata = pdata;
|
|
|
+ }
|
|
|
+ /* chip initialize */
|
|
|
+ rval = lm3630a_chip_init(pchip);
|
|
|
+ if (rval < 0) {
|
|
|
+ dev_err(&client->dev, "fail : init chip\n");
|
|
|
+ return rval;
|
|
|
+ }
|
|
|
+ /* backlight register */
|
|
|
+ rval = lm3630a_backlight_register(pchip);
|
|
|
+ if (rval < 0) {
|
|
|
+ dev_err(&client->dev, "fail : backlight register.\n");
|
|
|
+ return rval;
|
|
|
+ }
|
|
|
+ /* pwm */
|
|
|
+ if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
|
|
|
+ pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
|
|
|
+ if (IS_ERR(pchip->pwmd)) {
|
|
|
+ dev_err(&client->dev, "fail : get pwm device\n");
|
|
|
+ return PTR_ERR(pchip->pwmd);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ pchip->pwmd->period = pdata->pwm_period;
|
|
|
+
|
|
|
+ /* interrupt enable : irq 0 is not allowed */
|
|
|
+ pchip->irq = client->irq;
|
|
|
+ if (pchip->irq) {
|
|
|
+ rval = lm3630a_intr_config(pchip);
|
|
|
+ if (rval < 0)
|
|
|
+ return rval;
|
|
|
+ }
|
|
|
+ dev_info(&client->dev, "LM3630A backlight register OK.\n");
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lm3630a_remove(struct i2c_client *client)
|
|
|
+{
|
|
|
+ int rval;
|
|
|
+ struct lm3630a_chip *pchip = i2c_get_clientdata(client);
|
|
|
+
|
|
|
+ rval = lm3630a_write(pchip, REG_BRT_A, 0);
|
|
|
+ if (rval < 0)
|
|
|
+ dev_err(pchip->dev, "i2c failed to access register\n");
|
|
|
+
|
|
|
+ rval = lm3630a_write(pchip, REG_BRT_B, 0);
|
|
|
+ if (rval < 0)
|
|
|
+ dev_err(pchip->dev, "i2c failed to access register\n");
|
|
|
+
|
|
|
+ if (pchip->irq) {
|
|
|
+ free_irq(pchip->irq, pchip);
|
|
|
+ flush_workqueue(pchip->irqthread);
|
|
|
+ destroy_workqueue(pchip->irqthread);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct i2c_device_id lm3630a_id[] = {
|
|
|
+ {LM3630A_NAME, 0},
|
|
|
+ {}
|
|
|
+};
|
|
|
+
|
|
|
+MODULE_DEVICE_TABLE(i2c, lm3630a_id);
|
|
|
+
|
|
|
+static struct i2c_driver lm3630a_i2c_driver = {
|
|
|
+ .driver = {
|
|
|
+ .name = LM3630A_NAME,
|
|
|
+ },
|
|
|
+ .probe = lm3630a_probe,
|
|
|
+ .remove = lm3630a_remove,
|
|
|
+ .id_table = lm3630a_id,
|
|
|
+};
|
|
|
+
|
|
|
+module_i2c_driver(lm3630a_i2c_driver);
|
|
|
+
|
|
|
+MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
|
|
|
+MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
|
|
|
+MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
|
|
|
+MODULE_LICENSE("GPL v2");
|
Daniel Jeong