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023670295a
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Tested-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
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* LED driver for Marvell 88PM860x
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/88pm860x.h>
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#include <linux/module.h>
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#define LED_PWM_SHIFT (3)
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#define LED_PWM_MASK (0x1F)
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#define LED_CURRENT_MASK (0x07 << 5)
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#define LED_BLINK_ON_MASK (0x07)
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#define LED_BLINK_MASK (0x7F)
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#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
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#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
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#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
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#define LED_ON_CONTINUOUS (0x0F << 3)
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#define LED_TO_ON(x) ((x - 66) / 66)
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#define LED1_BLINK_EN (1 << 1)
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#define LED2_BLINK_EN (1 << 2)
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struct pm860x_led {
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struct led_classdev cdev;
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struct i2c_client *i2c;
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struct work_struct work;
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struct pm860x_chip *chip;
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struct mutex lock;
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char name[MFD_NAME_SIZE];
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int port;
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int iset;
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unsigned char brightness;
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unsigned char current_brightness;
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int blink_data;
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int blink_time;
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int blink_on;
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int blink_off;
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};
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/* return offset of color register */
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static inline int __led_off(int port)
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{
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int ret = -EINVAL;
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switch (port) {
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case PM8606_LED1_RED:
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case PM8606_LED1_GREEN:
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case PM8606_LED1_BLUE:
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ret = port - PM8606_LED1_RED + PM8606_RGB1B;
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break;
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case PM8606_LED2_RED:
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case PM8606_LED2_GREEN:
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case PM8606_LED2_BLUE:
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ret = port - PM8606_LED2_RED + PM8606_RGB2B;
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break;
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}
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return ret;
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}
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/* return offset of blink register */
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static inline int __blink_off(int port)
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{
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int ret = -EINVAL;
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switch (port) {
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case PM8606_LED1_RED:
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case PM8606_LED1_GREEN:
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case PM8606_LED1_BLUE:
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ret = PM8606_RGB1A;
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break;
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case PM8606_LED2_RED:
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case PM8606_LED2_GREEN:
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case PM8606_LED2_BLUE:
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ret = PM8606_RGB2A;
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break;
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}
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return ret;
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}
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static inline int __blink_ctl_mask(int port)
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{
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int ret = -EINVAL;
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switch (port) {
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case PM8606_LED1_RED:
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case PM8606_LED1_GREEN:
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case PM8606_LED1_BLUE:
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ret = LED1_BLINK_EN;
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break;
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case PM8606_LED2_RED:
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case PM8606_LED2_GREEN:
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case PM8606_LED2_BLUE:
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ret = LED2_BLINK_EN;
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break;
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}
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return ret;
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}
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static int led_power_set(struct pm860x_chip *chip, int port, int on)
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{
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int ret = -EINVAL;
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switch (port) {
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case PM8606_LED1_RED:
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case PM8606_LED1_GREEN:
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case PM8606_LED1_BLUE:
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ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
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pm8606_osc_disable(chip, RGB1_ENABLE);
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break;
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case PM8606_LED2_RED:
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case PM8606_LED2_GREEN:
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case PM8606_LED2_BLUE:
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ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
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pm8606_osc_disable(chip, RGB2_ENABLE);
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break;
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}
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return ret;
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}
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static void pm860x_led_work(struct work_struct *work)
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{
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struct pm860x_led *led;
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struct pm860x_chip *chip;
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unsigned char buf[3];
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int mask, ret;
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led = container_of(work, struct pm860x_led, work);
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chip = led->chip;
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mutex_lock(&led->lock);
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if ((led->current_brightness == 0) && led->brightness) {
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led_power_set(chip, led->port, 1);
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if (led->iset) {
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pm860x_set_bits(led->i2c, __led_off(led->port),
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LED_CURRENT_MASK, led->iset);
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}
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pm860x_set_bits(led->i2c, __blink_off(led->port),
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LED_BLINK_MASK, LED_ON_CONTINUOUS);
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mask = __blink_ctl_mask(led->port);
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pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
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}
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pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
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led->brightness);
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if (led->brightness == 0) {
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pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
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ret = buf[0] & LED_PWM_MASK;
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ret |= buf[1] & LED_PWM_MASK;
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ret |= buf[2] & LED_PWM_MASK;
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if (ret == 0) {
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/* unset current since no led is lighting */
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pm860x_set_bits(led->i2c, __led_off(led->port),
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LED_CURRENT_MASK, 0);
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mask = __blink_ctl_mask(led->port);
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pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
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led_power_set(chip, led->port, 0);
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}
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}
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led->current_brightness = led->brightness;
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dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
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__led_off(led->port), led->brightness);
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mutex_unlock(&led->lock);
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}
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static void pm860x_led_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
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data->brightness = value >> 3;
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schedule_work(&data->work);
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}
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static int pm860x_led_probe(struct platform_device *pdev)
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{
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm860x_led_pdata *pdata;
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struct pm860x_led *data;
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struct resource *res;
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_REG, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "No I/O resource!\n");
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return -EINVAL;
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}
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pdata = pdev->dev.platform_data;
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if (pdata == NULL) {
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dev_err(&pdev->dev, "No platform data!\n");
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return -EINVAL;
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}
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data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
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dev_set_drvdata(&pdev->dev, data);
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data->chip = chip;
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data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
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data->iset = pdata->iset;
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data->port = pdata->flags;
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if (data->port < 0) {
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dev_err(&pdev->dev, "check device failed\n");
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return -EINVAL;
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}
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data->current_brightness = 0;
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data->cdev.name = data->name;
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data->cdev.brightness_set = pm860x_led_set;
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mutex_init(&data->lock);
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INIT_WORK(&data->work, pm860x_led_work);
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ret = led_classdev_register(chip->dev, &data->cdev);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
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return ret;
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}
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pm860x_led_set(&data->cdev, 0);
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return 0;
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}
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static int pm860x_led_remove(struct platform_device *pdev)
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{
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struct pm860x_led *data = platform_get_drvdata(pdev);
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led_classdev_unregister(&data->cdev);
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return 0;
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}
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static struct platform_driver pm860x_led_driver = {
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.driver = {
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.name = "88pm860x-led",
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.owner = THIS_MODULE,
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},
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.probe = pm860x_led_probe,
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.remove = pm860x_led_remove,
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};
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module_platform_driver(pm860x_led_driver);
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MODULE_DESCRIPTION("LED driver for Marvell PM860x");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:88pm860x-led");
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