diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/video/backlight/pandora_bl.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/video/backlight/pandora_bl.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/ANDROID_3.4.5/drivers/video/backlight/pandora_bl.c b/ANDROID_3.4.5/drivers/video/backlight/pandora_bl.c deleted file mode 100644 index 4ec30748..00000000 --- a/ANDROID_3.4.5/drivers/video/backlight/pandora_bl.c +++ /dev/null @@ -1,171 +0,0 @@ -/* - * Backlight driver for Pandora handheld. - * Pandora uses TWL4030 PWM0 -> TPS61161 combo for control backlight. - * Based on pwm_bl.c - * - * Copyright 2009,2012 Gražvydas Ignotas <notasas@gmail.com> - * - * 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/module.h> -#include <linux/kernel.h> -#include <linux/platform_device.h> -#include <linux/delay.h> -#include <linux/fb.h> -#include <linux/backlight.h> -#include <linux/i2c/twl.h> -#include <linux/err.h> - -#define TWL_PWM0_ON 0x00 -#define TWL_PWM0_OFF 0x01 - -#define TWL_INTBR_GPBR1 0x0c -#define TWL_INTBR_PMBR1 0x0d - -#define TWL_PMBR1_PWM0_MUXMASK 0x0c -#define TWL_PMBR1_PWM0 0x04 -#define PWM0_CLK_ENABLE BIT(0) -#define PWM0_ENABLE BIT(2) - -/* range accepted by hardware */ -#define MIN_VALUE 9 -#define MAX_VALUE 63 -#define MAX_USER_VALUE (MAX_VALUE - MIN_VALUE) - -#define PANDORABL_WAS_OFF BL_CORE_DRIVER1 - -static int pandora_backlight_update_status(struct backlight_device *bl) -{ - int brightness = bl->props.brightness; - u8 r; - - if (bl->props.power != FB_BLANK_UNBLANK) - brightness = 0; - if (bl->props.state & BL_CORE_FBBLANK) - brightness = 0; - if (bl->props.state & BL_CORE_SUSPENDED) - brightness = 0; - - if ((unsigned int)brightness > MAX_USER_VALUE) - brightness = MAX_USER_VALUE; - - if (brightness == 0) { - if (bl->props.state & PANDORABL_WAS_OFF) - goto done; - - /* first disable PWM0 output, then clock */ - twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_GPBR1); - r &= ~PWM0_ENABLE; - twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1); - r &= ~PWM0_CLK_ENABLE; - twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1); - - goto done; - } - - if (bl->props.state & PANDORABL_WAS_OFF) { - /* - * set PWM duty cycle to max. TPS61161 seems to use this - * to calibrate it's PWM sensitivity when it starts. - */ - twl_i2c_write_u8(TWL4030_MODULE_PWM0, MAX_VALUE, - TWL_PWM0_OFF); - - /* first enable clock, then PWM0 out */ - twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_GPBR1); - r &= ~PWM0_ENABLE; - r |= PWM0_CLK_ENABLE; - twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1); - r |= PWM0_ENABLE; - twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_GPBR1); - - /* - * TI made it very easy to enable digital control, so easy that - * it often triggers unintentionally and disabes PWM control, - * so wait until 1 wire mode detection window ends. - */ - usleep_range(2000, 10000); - } - - twl_i2c_write_u8(TWL4030_MODULE_PWM0, MIN_VALUE + brightness, - TWL_PWM0_OFF); - -done: - if (brightness != 0) - bl->props.state &= ~PANDORABL_WAS_OFF; - else - bl->props.state |= PANDORABL_WAS_OFF; - - return 0; -} - -static int pandora_backlight_get_brightness(struct backlight_device *bl) -{ - return bl->props.brightness; -} - -static const struct backlight_ops pandora_backlight_ops = { - .options = BL_CORE_SUSPENDRESUME, - .update_status = pandora_backlight_update_status, - .get_brightness = pandora_backlight_get_brightness, -}; - -static int pandora_backlight_probe(struct platform_device *pdev) -{ - struct backlight_properties props; - struct backlight_device *bl; - u8 r; - - memset(&props, 0, sizeof(props)); - props.max_brightness = MAX_USER_VALUE; - props.type = BACKLIGHT_RAW; - bl = backlight_device_register(pdev->name, &pdev->dev, - NULL, &pandora_backlight_ops, &props); - if (IS_ERR(bl)) { - dev_err(&pdev->dev, "failed to register backlight\n"); - return PTR_ERR(bl); - } - - platform_set_drvdata(pdev, bl); - - /* 64 cycle period, ON position 0 */ - twl_i2c_write_u8(TWL4030_MODULE_PWM0, 0x80, TWL_PWM0_ON); - - bl->props.state |= PANDORABL_WAS_OFF; - bl->props.brightness = MAX_USER_VALUE; - backlight_update_status(bl); - - /* enable PWM function in pin mux */ - twl_i2c_read_u8(TWL4030_MODULE_INTBR, &r, TWL_INTBR_PMBR1); - r &= ~TWL_PMBR1_PWM0_MUXMASK; - r |= TWL_PMBR1_PWM0; - twl_i2c_write_u8(TWL4030_MODULE_INTBR, r, TWL_INTBR_PMBR1); - - return 0; -} - -static int pandora_backlight_remove(struct platform_device *pdev) -{ - struct backlight_device *bl = platform_get_drvdata(pdev); - backlight_device_unregister(bl); - return 0; -} - -static struct platform_driver pandora_backlight_driver = { - .driver = { - .name = "pandora-backlight", - .owner = THIS_MODULE, - }, - .probe = pandora_backlight_probe, - .remove = pandora_backlight_remove, -}; - -module_platform_driver(pandora_backlight_driver); - -MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>"); -MODULE_DESCRIPTION("Pandora Backlight Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:pandora-backlight"); |