mirror of https://gitee.com/openkylin/linux.git
275 lines
6.5 KiB
C
275 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Intel Corp. 2007.
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* All Rights Reserved.
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*
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* Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
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* develop this driver.
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*
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* This file is part of the Carillo Ranch video subsystem driver.
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*
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* Authors:
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* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
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* Alan Hourihane <alanh-at-tungstengraphics-dot-com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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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/mutex.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/lcd.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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/* The LVDS- and panel power controls sits on the
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* GPIO port of the ISA bridge.
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*/
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#define CRVML_DEVICE_LPC 0x27B8
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#define CRVML_REG_GPIOBAR 0x48
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#define CRVML_REG_GPIOEN 0x4C
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#define CRVML_GPIOEN_BIT (1 << 4)
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#define CRVML_PANEL_PORT 0x38
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#define CRVML_LVDS_ON 0x00000001
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#define CRVML_PANEL_ON 0x00000002
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#define CRVML_BACKLIGHT_OFF 0x00000004
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/* The PLL Clock register sits on Host bridge */
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#define CRVML_DEVICE_MCH 0x5001
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#define CRVML_REG_MCHBAR 0x44
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#define CRVML_REG_MCHEN 0x54
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#define CRVML_MCHEN_BIT (1 << 28)
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#define CRVML_MCHMAP_SIZE 4096
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#define CRVML_REG_CLOCK 0xc3c
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#define CRVML_CLOCK_SHIFT 8
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#define CRVML_CLOCK_MASK 0x00000f00
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static struct pci_dev *lpc_dev;
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static u32 gpio_bar;
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struct cr_panel {
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struct backlight_device *cr_backlight_device;
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struct lcd_device *cr_lcd_device;
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};
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static int cr_backlight_set_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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if (bd->props.power == FB_BLANK_UNBLANK)
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intensity = FB_BLANK_UNBLANK;
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if (bd->props.fb_blank == FB_BLANK_UNBLANK)
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intensity = FB_BLANK_UNBLANK;
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if (bd->props.power == FB_BLANK_POWERDOWN)
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intensity = FB_BLANK_POWERDOWN;
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if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
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intensity = FB_BLANK_POWERDOWN;
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if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
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cur &= ~CRVML_BACKLIGHT_OFF;
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outl(cur, addr);
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} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
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cur |= CRVML_BACKLIGHT_OFF;
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outl(cur, addr);
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} /* anything else, don't bother */
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return 0;
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}
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static int cr_backlight_get_intensity(struct backlight_device *bd)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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u8 intensity;
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if (cur & CRVML_BACKLIGHT_OFF)
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intensity = FB_BLANK_POWERDOWN;
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else
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intensity = FB_BLANK_UNBLANK;
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return intensity;
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}
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static const struct backlight_ops cr_backlight_ops = {
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.get_brightness = cr_backlight_get_intensity,
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.update_status = cr_backlight_set_intensity,
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};
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static void cr_panel_on(void)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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if (!(cur & CRVML_PANEL_ON)) {
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/* Make sure LVDS controller is down. */
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if (cur & 0x00000001) {
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cur &= ~CRVML_LVDS_ON;
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outl(cur, addr);
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}
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/* Power up Panel */
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schedule_timeout(HZ / 10);
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cur |= CRVML_PANEL_ON;
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outl(cur, addr);
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}
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/* Power up LVDS controller */
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if (!(cur & CRVML_LVDS_ON)) {
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schedule_timeout(HZ / 10);
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outl(cur | CRVML_LVDS_ON, addr);
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}
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}
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static void cr_panel_off(void)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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/* Power down LVDS controller first to avoid high currents */
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if (cur & CRVML_LVDS_ON) {
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cur &= ~CRVML_LVDS_ON;
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outl(cur, addr);
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}
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if (cur & CRVML_PANEL_ON) {
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schedule_timeout(HZ / 10);
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outl(cur & ~CRVML_PANEL_ON, addr);
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}
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}
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static int cr_lcd_set_power(struct lcd_device *ld, int power)
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{
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if (power == FB_BLANK_UNBLANK)
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cr_panel_on();
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if (power == FB_BLANK_POWERDOWN)
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cr_panel_off();
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return 0;
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}
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static struct lcd_ops cr_lcd_ops = {
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.set_power = cr_lcd_set_power,
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};
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static int cr_backlight_probe(struct platform_device *pdev)
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{
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struct backlight_properties props;
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struct backlight_device *bdp;
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struct lcd_device *ldp;
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struct cr_panel *crp;
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u8 dev_en;
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lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
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CRVML_DEVICE_LPC, NULL);
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if (!lpc_dev) {
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pr_err("INTEL CARILLO RANCH LPC not found.\n");
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return -ENODEV;
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}
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pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
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if (!(dev_en & CRVML_GPIOEN_BIT)) {
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pr_err("Carillo Ranch GPIO device was not enabled.\n");
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pci_dev_put(lpc_dev);
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return -ENODEV;
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}
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight",
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&pdev->dev, NULL, &cr_backlight_ops,
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&props);
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if (IS_ERR(bdp)) {
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pci_dev_put(lpc_dev);
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return PTR_ERR(bdp);
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}
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ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL,
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&cr_lcd_ops);
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if (IS_ERR(ldp)) {
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pci_dev_put(lpc_dev);
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return PTR_ERR(ldp);
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}
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pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
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&gpio_bar);
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gpio_bar &= ~0x3F;
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crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL);
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if (!crp) {
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pci_dev_put(lpc_dev);
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return -ENOMEM;
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}
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crp->cr_backlight_device = bdp;
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crp->cr_lcd_device = ldp;
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crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
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crp->cr_backlight_device->props.brightness = 0;
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cr_backlight_set_intensity(crp->cr_backlight_device);
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cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
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platform_set_drvdata(pdev, crp);
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return 0;
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}
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static int cr_backlight_remove(struct platform_device *pdev)
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{
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struct cr_panel *crp = platform_get_drvdata(pdev);
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crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
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crp->cr_backlight_device->props.brightness = 0;
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crp->cr_backlight_device->props.max_brightness = 0;
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cr_backlight_set_intensity(crp->cr_backlight_device);
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cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
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pci_dev_put(lpc_dev);
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return 0;
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}
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static struct platform_driver cr_backlight_driver = {
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.probe = cr_backlight_probe,
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.remove = cr_backlight_remove,
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.driver = {
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.name = "cr_backlight",
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},
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};
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static struct platform_device *crp;
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static int __init cr_backlight_init(void)
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{
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int ret = platform_driver_register(&cr_backlight_driver);
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if (ret)
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return ret;
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crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
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if (IS_ERR(crp)) {
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platform_driver_unregister(&cr_backlight_driver);
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return PTR_ERR(crp);
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}
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pr_info("Carillo Ranch Backlight Driver Initialized.\n");
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return 0;
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}
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static void __exit cr_backlight_exit(void)
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{
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platform_device_unregister(crp);
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platform_driver_unregister(&cr_backlight_driver);
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}
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module_init(cr_backlight_init);
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module_exit(cr_backlight_exit);
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MODULE_AUTHOR("Tungsten Graphics Inc.");
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MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
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MODULE_LICENSE("GPL");
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