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path: root/ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c
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Diffstat (limited to 'ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c')
-rw-r--r--ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c240
1 files changed, 0 insertions, 240 deletions
diff --git a/ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c b/ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c
deleted file mode 100644
index 5d365deb..00000000
--- a/ANDROID_3.4.5/drivers/video/backlight/wm831x_bl.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * Backlight driver for Wolfson Microelectronics WM831x PMICs
- *
- * Copyright 2009 Wolfson Microelectonics plc
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/fb.h>
-#include <linux/backlight.h>
-#include <linux/slab.h>
-
-#include <linux/mfd/wm831x/core.h>
-#include <linux/mfd/wm831x/pdata.h>
-#include <linux/mfd/wm831x/regulator.h>
-
-struct wm831x_backlight_data {
- struct wm831x *wm831x;
- int isink_reg;
- int current_brightness;
-};
-
-static int wm831x_backlight_set(struct backlight_device *bl, int brightness)
-{
- struct wm831x_backlight_data *data = bl_get_data(bl);
- struct wm831x *wm831x = data->wm831x;
- int power_up = !data->current_brightness && brightness;
- int power_down = data->current_brightness && !brightness;
- int ret;
-
- if (power_up) {
- /* Enable the ISINK */
- ret = wm831x_set_bits(wm831x, data->isink_reg,
- WM831X_CS1_ENA, WM831X_CS1_ENA);
- if (ret < 0)
- goto err;
-
- /* Enable the DC-DC */
- ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
- WM831X_DC4_ENA, WM831X_DC4_ENA);
- if (ret < 0)
- goto err;
- }
-
- if (power_down) {
- /* DCDC first */
- ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
- WM831X_DC4_ENA, 0);
- if (ret < 0)
- goto err;
-
- /* ISINK */
- ret = wm831x_set_bits(wm831x, data->isink_reg,
- WM831X_CS1_DRIVE | WM831X_CS1_ENA, 0);
- if (ret < 0)
- goto err;
- }
-
- /* Set the new brightness */
- ret = wm831x_set_bits(wm831x, data->isink_reg,
- WM831X_CS1_ISEL_MASK, brightness);
- if (ret < 0)
- goto err;
-
- if (power_up) {
- /* Drive current through the ISINK */
- ret = wm831x_set_bits(wm831x, data->isink_reg,
- WM831X_CS1_DRIVE, WM831X_CS1_DRIVE);
- if (ret < 0)
- return ret;
- }
-
- data->current_brightness = brightness;
-
- return 0;
-
-err:
- /* If we were in the middle of a power transition always shut down
- * for safety.
- */
- if (power_up || power_down) {
- wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
- wm831x_set_bits(wm831x, data->isink_reg, WM831X_CS1_ENA, 0);
- }
-
- return ret;
-}
-
-static int wm831x_backlight_update_status(struct backlight_device *bl)
-{
- int brightness = bl->props.brightness;
-
- if (bl->props.power != FB_BLANK_UNBLANK)
- brightness = 0;
-
- if (bl->props.fb_blank != FB_BLANK_UNBLANK)
- brightness = 0;
-
- if (bl->props.state & BL_CORE_SUSPENDED)
- brightness = 0;
-
- return wm831x_backlight_set(bl, brightness);
-}
-
-static int wm831x_backlight_get_brightness(struct backlight_device *bl)
-{
- struct wm831x_backlight_data *data = bl_get_data(bl);
- return data->current_brightness;
-}
-
-static const struct backlight_ops wm831x_backlight_ops = {
- .options = BL_CORE_SUSPENDRESUME,
- .update_status = wm831x_backlight_update_status,
- .get_brightness = wm831x_backlight_get_brightness,
-};
-
-static int wm831x_backlight_probe(struct platform_device *pdev)
-{
- struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
- struct wm831x_pdata *wm831x_pdata;
- struct wm831x_backlight_pdata *pdata;
- struct wm831x_backlight_data *data;
- struct backlight_device *bl;
- struct backlight_properties props;
- int ret, i, max_isel, isink_reg, dcdc_cfg;
-
- /* We need platform data */
- if (pdev->dev.parent->platform_data) {
- wm831x_pdata = pdev->dev.parent->platform_data;
- pdata = wm831x_pdata->backlight;
- } else {
- pdata = NULL;
- }
-
- if (!pdata) {
- dev_err(&pdev->dev, "No platform data supplied\n");
- return -EINVAL;
- }
-
- /* Figure out the maximum current we can use */
- for (i = 0; i < WM831X_ISINK_MAX_ISEL; i++) {
- if (wm831x_isinkv_values[i] > pdata->max_uA)
- break;
- }
-
- if (i == 0) {
- dev_err(&pdev->dev, "Invalid max_uA: %duA\n", pdata->max_uA);
- return -EINVAL;
- }
- max_isel = i - 1;
-
- if (pdata->max_uA != wm831x_isinkv_values[max_isel])
- dev_warn(&pdev->dev,
- "Maximum current is %duA not %duA as requested\n",
- wm831x_isinkv_values[max_isel], pdata->max_uA);
-
- switch (pdata->isink) {
- case 1:
- isink_reg = WM831X_CURRENT_SINK_1;
- dcdc_cfg = 0;
- break;
- case 2:
- isink_reg = WM831X_CURRENT_SINK_2;
- dcdc_cfg = WM831X_DC4_FBSRC;
- break;
- default:
- dev_err(&pdev->dev, "Invalid ISINK %d\n", pdata->isink);
- return -EINVAL;
- }
-
- /* Configure the ISINK to use for feedback */
- ret = wm831x_reg_unlock(wm831x);
- if (ret < 0)
- return ret;
-
- ret = wm831x_set_bits(wm831x, WM831X_DC4_CONTROL, WM831X_DC4_FBSRC,
- dcdc_cfg);
-
- wm831x_reg_lock(wm831x);
- if (ret < 0)
- return ret;
-
- data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- data->wm831x = wm831x;
- data->current_brightness = 0;
- data->isink_reg = isink_reg;
-
- props.type = BACKLIGHT_RAW;
- props.max_brightness = max_isel;
- bl = backlight_device_register("wm831x", &pdev->dev, data,
- &wm831x_backlight_ops, &props);
- if (IS_ERR(bl)) {
- dev_err(&pdev->dev, "failed to register backlight\n");
- return PTR_ERR(bl);
- }
-
- bl->props.brightness = max_isel;
-
- platform_set_drvdata(pdev, bl);
-
- /* Disable the DCDC if it was started so we can bootstrap */
- wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
-
- backlight_update_status(bl);
-
- return 0;
-}
-
-static int wm831x_backlight_remove(struct platform_device *pdev)
-{
- struct backlight_device *bl = platform_get_drvdata(pdev);
-
- backlight_device_unregister(bl);
- return 0;
-}
-
-static struct platform_driver wm831x_backlight_driver = {
- .driver = {
- .name = "wm831x-backlight",
- .owner = THIS_MODULE,
- },
- .probe = wm831x_backlight_probe,
- .remove = wm831x_backlight_remove,
-};
-
-module_platform_driver(wm831x_backlight_driver);
-
-MODULE_DESCRIPTION("Backlight Driver for WM831x PMICs");
-MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:wm831x-backlight");
generated by cgit (git 2.34.1) at 2025-01-08 06:02:25 +0000