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path: root/drivers/video/atmel_lcdfb.c
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Diffstat (limited to 'drivers/video/atmel_lcdfb.c')
-rw-r--r--drivers/video/atmel_lcdfb.c139
1 files changed, 133 insertions, 6 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 11a3a222dfc..fc65c02306d 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -16,6 +16,7 @@
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/backlight.h>
#include <asm/arch/board.h>
#include <asm/arch/cpu.h>
@@ -30,7 +31,7 @@
#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
#define ATMEL_LCDC_DMA_BURST_LEN 8
-#if defined(CONFIG_ARCH_AT91SAM9263)
+#if defined(CONFIG_ARCH_AT91SAM9263) || defined(CONFIG_ARCH_AT91CAP9)
#define ATMEL_LCDC_FIFO_SIZE 2048
#else
#define ATMEL_LCDC_FIFO_SIZE 512
@@ -69,6 +70,107 @@ static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
}
#endif
+static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
+ | ATMEL_LCDC_POL_POSITIVE
+ | ATMEL_LCDC_ENA_PWMENABLE;
+
+#ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
+
+/* some bl->props field just changed */
+static int atmel_bl_update_status(struct backlight_device *bl)
+{
+ struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
+ int power = sinfo->bl_power;
+ int brightness = bl->props.brightness;
+
+ /* REVISIT there may be a meaningful difference between
+ * fb_blank and power ... there seem to be some cases
+ * this doesn't handle correctly.
+ */
+ if (bl->props.fb_blank != sinfo->bl_power)
+ power = bl->props.fb_blank;
+ else if (bl->props.power != sinfo->bl_power)
+ power = bl->props.power;
+
+ if (brightness < 0 && power == FB_BLANK_UNBLANK)
+ brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
+ else if (power != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
+ brightness ? contrast_ctr : 0);
+
+ bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
+
+ return 0;
+}
+
+static int atmel_bl_get_brightness(struct backlight_device *bl)
+{
+ struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
+
+ return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
+}
+
+static struct backlight_ops atmel_lcdc_bl_ops = {
+ .update_status = atmel_bl_update_status,
+ .get_brightness = atmel_bl_get_brightness,
+};
+
+static void init_backlight(struct atmel_lcdfb_info *sinfo)
+{
+ struct backlight_device *bl;
+
+ sinfo->bl_power = FB_BLANK_UNBLANK;
+
+ if (sinfo->backlight)
+ return;
+
+ bl = backlight_device_register("backlight", &sinfo->pdev->dev,
+ sinfo, &atmel_lcdc_bl_ops);
+ if (IS_ERR(sinfo->backlight)) {
+ dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
+ PTR_ERR(bl));
+ return;
+ }
+ sinfo->backlight = bl;
+
+ bl->props.power = FB_BLANK_UNBLANK;
+ bl->props.fb_blank = FB_BLANK_UNBLANK;
+ bl->props.max_brightness = 0xff;
+ bl->props.brightness = atmel_bl_get_brightness(bl);
+}
+
+static void exit_backlight(struct atmel_lcdfb_info *sinfo)
+{
+ if (sinfo->backlight)
+ backlight_device_unregister(sinfo->backlight);
+}
+
+#else
+
+static void init_backlight(struct atmel_lcdfb_info *sinfo)
+{
+ dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
+}
+
+static void exit_backlight(struct atmel_lcdfb_info *sinfo)
+{
+}
+
+#endif
+
+static void init_contrast(struct atmel_lcdfb_info *sinfo)
+{
+ /* have some default contrast/backlight settings */
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
+ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
+
+ if (sinfo->lcdcon_is_backlight)
+ init_backlight(sinfo);
+}
+
static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
.type = FB_TYPE_PACKED_PIXELS,
@@ -203,6 +305,26 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
var->transp.offset = var->transp.length = 0;
var->xoffset = var->yoffset = 0;
+ /* Saturate vertical and horizontal timings at maximum values */
+ var->vsync_len = min_t(u32, var->vsync_len,
+ (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
+ var->upper_margin = min_t(u32, var->upper_margin,
+ ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
+ var->lower_margin = min_t(u32, var->lower_margin,
+ ATMEL_LCDC_VFP);
+ var->right_margin = min_t(u32, var->right_margin,
+ (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
+ var->hsync_len = min_t(u32, var->hsync_len,
+ (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
+ var->left_margin = min_t(u32, var->left_margin,
+ ATMEL_LCDC_HBP + 1);
+
+ /* Some parameters can't be zero */
+ var->vsync_len = max_t(u32, var->vsync_len, 1);
+ var->right_margin = max_t(u32, var->right_margin, 1);
+ var->hsync_len = max_t(u32, var->hsync_len, 1);
+ var->left_margin = max_t(u32, var->left_margin, 1);
+
switch (var->bits_per_pixel) {
case 1:
case 2:
@@ -370,10 +492,6 @@ static int atmel_lcdfb_set_par(struct fb_info *info)
/* Disable all interrupts */
lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
- /* Set contrast */
- value = ATMEL_LCDC_PS_DIV8 | ATMEL_LCDC_POL_POSITIVE | ATMEL_LCDC_ENA_PWMENABLE;
- lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, value);
- lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
/* ...wait for DMA engine to become idle... */
while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
msleep(10);
@@ -577,6 +695,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
sinfo->default_monspecs = pdata_sinfo->default_monspecs;
sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
sinfo->guard_time = pdata_sinfo->guard_time;
+ sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
} else {
dev_err(dev, "cannot get default configuration\n");
goto free_info;
@@ -670,6 +789,9 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
goto release_mem;
}
+ /* Initialize PWM for contrast or backlight ("off") */
+ init_contrast(sinfo);
+
/* interrupt */
ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
if (ret) {
@@ -721,6 +843,7 @@ free_cmap:
unregister_irqs:
free_irq(sinfo->irq_base, info);
unmap_mmio:
+ exit_backlight(sinfo);
iounmap(sinfo->mmio);
release_mem:
release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
@@ -755,6 +878,7 @@ static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
if (!sinfo)
return 0;
+ exit_backlight(sinfo);
if (sinfo->atmel_lcdfb_power_control)
sinfo->atmel_lcdfb_power_control(0);
unregister_framebuffer(info);
@@ -781,6 +905,9 @@ static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
static struct platform_driver atmel_lcdfb_driver = {
.remove = __exit_p(atmel_lcdfb_remove),
+
+// FIXME need suspend, resume
+
.driver = {
.name = "atmel_lcdfb",
.owner = THIS_MODULE,
@@ -801,5 +928,5 @@ module_init(atmel_lcdfb_init);
module_exit(atmel_lcdfb_exit);
MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
-MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@rfo.atmel.com>");
+MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-07 04:37:21 +0000