#endif\r
\r
\r
+/*****************************************************************************************\r
+ * backlight devices\r
+ * author: nzy@rock-chips.com\r
+ *****************************************************************************************/\r
+#ifdef CONFIG_BACKLIGHT_RK29_BL\r
+ /*\r
+ GPIO1B5_PWM0_NAME, GPIO1L_PWM0\r
+ GPIO5D2_PWM1_UART1SIRIN_NAME, GPIO5H_PWM1\r
+ GPIO2A3_SDMMC0WRITEPRT_PWM2_NAME, GPIO2L_PWM2\r
+ GPIO1A5_EMMCPWREN_PWM3_NAME, GPIO1L_PWM3\r
+ */\r
+ \r
+#define PWM_ID 0 \r
+#define PWM_MUX_NAME GPIO1B5_PWM0_NAME\r
+#define PWM_MUX_MODE GPIO1L_PWM0\r
+#define PWM_MUX_MODE_GPIO GPIO1L_GPIO1B5\r
+#define PWM_EFFECT_VALUE 0\r
+\r
+//#define LCD_DISP_ON_PIN\r
+\r
+#ifdef LCD_DISP_ON_PIN\r
+#define BL_EN_MUX_NAME GPIOF34_UART3_SEL_NAME\r
+#define BL_EN_MUX_MODE IOMUXB_GPIO1_B34\r
+\r
+#define BL_EN_PIN GPIO0L_GPIO0A5\r
+#define BL_EN_VALUE GPIO_HIGH\r
+#endif\r
+static int rk29_backlight_io_init(void)\r
+{\r
+ int ret = 0;\r
+ \r
+ rk29_mux_api_set(PWM_MUX_NAME, PWM_MUX_MODE);\r
+ #ifdef LCD_DISP_ON_PIN\r
+ rk29_mux_api_set(BL_EN_MUX_NAME, BL_EN_MUX_MODE); \r
+ \r
+ ret = gpio_request(BL_EN_PIN, NULL); \r
+ if(ret != 0)\r
+ {\r
+ gpio_free(BL_EN_PIN); \r
+ }\r
+ \r
+ gpio_direction_output(BL_EN_PIN, 0);\r
+ gpio_set_value(BL_EN_PIN, BL_EN_VALUE);\r
+ #endif\r
+ return ret;\r
+}\r
+\r
+static int rk29_backlight_io_deinit(void)\r
+{\r
+ int ret = 0;\r
+ #ifdef LCD_DISP_ON_PIN\r
+ gpio_free(BL_EN_PIN);\r
+ #endif\r
+ rk29_mux_api_set(PWM_MUX_NAME, PWM_MUX_MODE_GPIO);\r
+ return ret;\r
+}\r
+struct rk29_bl_info rk29_bl_info = {\r
+ .pwm_id = PWM_ID,\r
+ .bl_ref = PWM_EFFECT_VALUE,\r
+ .io_init = rk29_backlight_io_init,\r
+ .io_deinit = rk29_backlight_io_deinit, \r
+};\r
+#endif\r
/*****************************************************************************************\r
* SDMMC devices\r
*****************************************************************************************/\r
#ifdef CONFIG_FB_RK29\r
&rk29_device_fb,\r
#endif\r
+#ifdef CONFIG_BACKLIGHT_RK29_BL\r
+ &rk29_device_backlight,\r
+#endif\r
#ifdef CONFIG_VIVANTE\r
&rk29_device_gpu,\r
#endif\r
--- /dev/null
+/* drivers/video/backlight/rk29_backlight.c
+ *
+ * Copyright (C) 2009 Rockchip Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/debugfs.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/cpufreq.h>
+#include <linux/clk.h>
+
+#include <linux/earlysuspend.h>
+#include <asm/io.h>
+//#include <mach/typedef.h>
+#include <mach/iomux.h>
+#include <mach/gpio.h>
+#include <mach/rk29_iomap.h>
+#include <mach/board.h>
+
+#include "rk2818_backlight.h"
+
+/*
+ * Debug
+ */
+#if 0
+#define DBG(x...) printk(KERN_INFO x)
+#else
+#define DBG(x...)
+#endif
+
+
+#define write_pwm_reg(id, addr, val) __raw_writel(val, addr+(RK29_PWM_BASE+id*0x10))
+#define read_pwm_reg(id, addr) __raw_readl(addr+(RK29_PWM_BASE+id*0x10))
+#define mask_pwm_reg(id, addr, msk, val) write_dma_reg(id, addr, (val)|((~(msk))&read_dma_reg(id, addr)))
+
+static struct clk *pwm_clk;
+static unsigned long pwm_clk_rate;
+static struct backlight_device *rk29_bl;
+static int suspend_flag = 0;
+#define BACKLIGHT_SEE_MINVALUE 52
+
+static s32 rk29_bl_update_status(struct backlight_device *bl)
+{
+ u32 divh,div_total;
+ struct rk29_bl_info *rk29_bl_info = bl->dev.parent->platform_data;
+ u32 id = rk29_bl_info->pwm_id;
+ u32 ref = rk29_bl_info->bl_ref;
+
+ if (suspend_flag)
+ return 0;
+
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+ if (ref) {
+
+ divh = div_total*(bl->props.brightness)/BL_STEP;
+ DBG(">>>%s-->%d bl->props.brightness == %d, div_total == %d , divh == %d\n",__FUNCTION__,__LINE__,bl->props.brightness, div_total, divh);
+ } else {
+ DBG(">>>%s-->%d bl->props.brightness == %d\n",__FUNCTION__,__LINE__,bl->props.brightness);
+ if(bl->props.brightness < BACKLIGHT_SEE_MINVALUE) /*avoid can't view screen when close backlight*/
+ bl->props.brightness = BACKLIGHT_SEE_MINVALUE;
+ divh = div_total*(BL_STEP-bl->props.brightness)/BL_STEP;
+ }
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ return 0;
+}
+
+static s32 rk29_bl_get_brightness(struct backlight_device *bl)
+{
+ u32 divh,div_total;
+ struct rk29_bl_info *rk29_bl_info = bl->dev.parent->platform_data;
+ u32 id = rk29_bl_info->pwm_id;
+ u32 ref = rk29_bl_info->bl_ref;
+
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+ divh = read_pwm_reg(id, PWM_REG_HRC);
+
+ DBG("%s:: %d div_total: %d\n",__func__,__LINE__,div_total);
+
+ if (ref) {
+ return BL_STEP*divh/div_total;
+ } else {
+ return BL_STEP-(BL_STEP*divh/div_total);
+ }
+}
+
+static struct backlight_ops rk29_bl_ops = {
+ .update_status = rk29_bl_update_status,
+ .get_brightness = rk29_bl_get_brightness,
+};
+
+#ifdef CONFIG_CPU_FREQ
+static int rk29_bl_change_clk(struct notifier_block *nb, unsigned long val, void *data)
+{
+ struct rk29_bl_info *rk29_bl_info;
+ u32 id;
+ u32 divl, divh, tmp;
+ u32 div_total;
+ int is_suspended = suspend_flag;
+
+ if (!rk29_bl) {
+ DBG(KERN_CRIT "%s: backlight device does not exist\n", __func__);
+ return -ENODEV;
+ }
+
+ switch (val) {
+ case CPUFREQ_PRECHANGE:
+ break;
+ case CPUFREQ_POSTCHANGE:
+ if (clk_get_rate(pwm_clk) == pwm_clk_rate)
+ break;
+ pwm_clk_rate = clk_get_rate(pwm_clk);
+ rk29_bl_info = rk29_bl->dev.parent->platform_data;
+ id = rk29_bl_info->pwm_id;
+
+
+
+ divl = read_pwm_reg(id, PWM_REG_LRC);
+ divh = read_pwm_reg(id, PWM_REG_HRC);
+
+ tmp = pwm_clk_rate / PWM_APB_PRE_DIV;
+ tmp >>= (1 + (PWM_DIV >> 9));
+
+
+ div_total = (tmp) ? tmp : 1;
+ tmp = div_total*divh/divl;
+
+ if (!is_suspended)
+ clk_disable(pwm_clk);
+ write_pwm_reg(id, PWM_REG_LRC, div_total);
+ write_pwm_reg(id, PWM_REG_HRC, tmp);
+ write_pwm_reg(id, PWM_REG_CNTR, 0);
+ if (!is_suspended)
+ clk_enable(pwm_clk);
+ break;
+ }
+
+ return 0;
+}
+#endif
+static void rk29_delaybacklight_timer(unsigned long data)
+{
+ struct rk29_bl_info *rk29_bl_info = (struct rk29_bl_info *)data;
+ u32 id, brightness;
+ u32 div_total, divh;
+ clk_enable(pwm_clk);
+ id = rk29_bl_info->pwm_id;
+ brightness = rk29_bl->props.brightness;
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+ if (rk29_bl_info->bl_ref) {
+ divh = div_total*(brightness)/BL_STEP;
+ } else {
+ divh = div_total*(BL_STEP-brightness)/BL_STEP;
+ }
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ suspend_flag = 0;
+}
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+static void rk29_bl_suspend(struct early_suspend *h)
+{
+ struct rk29_bl_info *rk29_bl_info;
+ u32 id;
+ u32 div_total, divh;
+
+ rk29_bl_info = rk29_bl->dev.parent->platform_data;
+
+ id = rk29_bl_info->pwm_id;
+
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+
+ if(rk29_bl_info->bl_ref) {
+ divh = 0;
+ } else {
+ divh = div_total;
+ }
+
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ if (!suspend_flag)
+ clk_disable(pwm_clk);
+
+ suspend_flag = 1;
+}
+
+
+static void rk29_bl_resume(struct early_suspend *h)
+{
+ struct rk29_bl_info *rk29_bl_info;
+ // u32 id, brightness;
+ //u32 div_total, divh;
+ DBG("%s : %s\n", __FILE__, __FUNCTION__);
+ rk29_bl_info = rk29_bl->dev.parent->platform_data;
+
+ rk29_bl_info->timer.expires = jiffies + 30;
+ add_timer(&rk29_bl_info->timer);
+ #if 0
+ id = rk28_bl_info->pwm_id;
+ brightness = rk28_bl->props.brightness;
+
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+ if (rk28_bl_info->bl_ref) {
+ divh = div_total*(brightness)/BL_STEP;
+ } else {
+ divh = div_total*(BL_STEP-brightness)/BL_STEP;
+ }
+ //mdelay(100);
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+
+ suspend_flag = 0;
+ #endif
+}
+
+static struct early_suspend bl_early_suspend;
+#endif
+
+static int rk29_backlight_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct rk29_bl_info *rk29_bl_info = pdev->dev.platform_data;
+ u32 id = rk29_bl_info->pwm_id;
+ u32 divh, div_total;
+
+ if (rk29_bl) {
+ DBG(KERN_CRIT "%s: backlight device register has existed \n",
+ __func__);
+ return -EEXIST;
+ }
+
+ rk29_bl = backlight_device_register("rk28_bl", &pdev->dev, NULL, &rk29_bl_ops);
+ if (!rk29_bl) {
+ DBG(KERN_CRIT "%s: backlight device register error\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ if (!pwm_clk)
+ pwm_clk = clk_get(NULL, "pwm");
+ if (!pwm_clk || IS_ERR(pwm_clk)) {
+ printk(KERN_ERR "failed to get pwm clock source\n");
+ return -ENODEV;
+ }
+ pwm_clk_rate = clk_get_rate(pwm_clk);
+ div_total = pwm_clk_rate / PWM_APB_PRE_DIV;
+
+
+
+ div_total >>= (1 + (PWM_DIV >> 9));
+ div_total = (div_total) ? div_total : 1;
+
+ /// if(rk29_bl_info->bl_ref) {
+ /// divh = 0;
+ /// } else {
+ divh = div_total / 2;
+ // }
+
+ /*init timer to dispose workqueue */
+ setup_timer(&rk29_bl_info->timer, rk29_delaybacklight_timer, (unsigned long)rk29_bl_info);
+
+#ifdef CONFIG_CPU_FREQ
+ rk29_bl_info->freq_transition.notifier_call = rk29_bl_change_clk;
+ cpufreq_register_notifier(&rk29_bl_info->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
+#endif
+
+// clk_disable(pwm_clk);
+ write_pwm_reg(id, PWM_REG_CTRL, PWM_DIV|PWM_RESET);
+ write_pwm_reg(id, PWM_REG_LRC, div_total);
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ write_pwm_reg(id, PWM_REG_CNTR, 0x0);
+ write_pwm_reg(id, PWM_REG_CTRL, PWM_DIV|PWM_ENABLE|PWM_TIME_EN);
+ clk_enable(pwm_clk);
+
+ rk29_bl->props.power = FB_BLANK_UNBLANK;
+ rk29_bl->props.fb_blank = FB_BLANK_UNBLANK;
+ rk29_bl->props.max_brightness = BL_STEP;
+ rk29_bl->props.brightness = rk29_bl_get_brightness(rk29_bl);
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ bl_early_suspend.suspend = rk29_bl_suspend;
+ bl_early_suspend.resume = rk29_bl_resume;
+ bl_early_suspend.level = ~0x0;
+ register_early_suspend(&bl_early_suspend);
+#endif
+
+ if (rk29_bl_info && rk29_bl_info->io_init) {
+ rk29_bl_info->io_init();
+ }
+
+ return ret;
+}
+
+static int rk29_backlight_remove(struct platform_device *pdev)
+{
+ struct rk29_bl_info *rk29_bl_info = pdev->dev.platform_data;
+
+ if (rk29_bl) {
+ backlight_device_unregister(rk29_bl);
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ unregister_early_suspend(&bl_early_suspend);
+#endif
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_unregister_notifier(&rk29_bl_info->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
+#endif
+ clk_disable(pwm_clk);
+ clk_put(pwm_clk);
+ if (rk29_bl_info && rk29_bl_info->io_deinit) {
+ rk29_bl_info->io_deinit();
+ }
+ return 0;
+ } else {
+ DBG(KERN_CRIT "%s: no backlight device has registered\n",
+ __func__);
+ return -ENODEV;
+ }
+}
+static void rk29_backlight_shutdown(struct platform_device *pdev)
+{
+
+ u32 divh,div_total;
+ struct rk29_bl_info *rk29_bl_info = pdev->dev.platform_data;
+ u32 id = rk29_bl_info->pwm_id;
+ u32 brightness;
+ brightness = rk29_bl->props.brightness;
+ brightness/=2;
+ div_total = read_pwm_reg(id, PWM_REG_LRC);
+
+ if (rk29_bl_info->bl_ref) {
+ divh = div_total*(brightness)/BL_STEP;
+ } else {
+ divh = div_total*(BL_STEP-brightness)/BL_STEP;
+ }
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ //printk("divh=%d\n",divh);
+ mdelay(100);
+
+ brightness/=2;
+ if (rk29_bl_info->bl_ref) {
+ divh = div_total*(brightness)/BL_STEP;
+ } else {
+ divh = div_total*(BL_STEP-brightness)/BL_STEP;
+ }
+
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+ mdelay(100);
+ /*set PF1=1 PF2=1 for close backlight*/
+
+ if(rk29_bl_info->bl_ref) {
+ divh = 0;
+ } else {
+ divh = div_total;
+ }
+ write_pwm_reg(id, PWM_REG_HRC, divh);
+
+}
+
+static struct platform_driver rk29_backlight_driver = {
+ .probe = rk29_backlight_probe,
+ .remove = rk29_backlight_remove,
+ .driver = {
+ .name = "rk29_backlight",
+ .owner = THIS_MODULE,
+ },
+ .shutdown=rk29_backlight_shutdown,
+};
+
+
+static int __init rk29_backlight_init(void)
+{
+ platform_driver_register(&rk29_backlight_driver);
+ return 0;
+}
+//rootfs_initcall(rk29_backlight_init);
+
+late_initcall(rk29_backlight_init);
+//module_init(rk29_backlight_init);
projects / firefly-linux-kernel-4.4.55.git / commitdiff