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Based on 2 normalized pattern(s): driver is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version the [carillo] [ranch] [video] [subsystem] driver 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 you should have received a copy of the gnu general public license along with this driver if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa driver is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version the [vermilion] [range] [fb] driver 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 you should have received a copy of the gnu general public license along with this driver if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 4 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.916314029@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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