1/* 2 * Copyright (c) Intel Corp. 2007. 3 * All Rights Reserved. 4 * 5 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to 6 * develop this driver. 7 * 8 * This file is part of the Carillo Ranch video subsystem driver. 9 * The Carillo Ranch video subsystem driver is free software; 10 * you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * The Carillo Ranch video subsystem driver is distributed 16 * in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this driver; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 * 25 * Authors: 26 * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com> 27 * Alan Hourihane <alanh-at-tungstengraphics-dot-com> 28 */ 29 30#include <linux/module.h> 31#include <linux/kernel.h> 32#include <linux/init.h> 33#include <linux/platform_device.h> 34#include <linux/mutex.h> 35#include <linux/fb.h> 36#include <linux/backlight.h> 37#include <linux/lcd.h> 38#include <linux/pci.h> 39#include <linux/slab.h> 40 41/* The LVDS- and panel power controls sits on the 42 * GPIO port of the ISA bridge. 43 */ 44 45#define CRVML_DEVICE_LPC 0x27B8 46#define CRVML_REG_GPIOBAR 0x48 47#define CRVML_REG_GPIOEN 0x4C 48#define CRVML_GPIOEN_BIT (1 << 4) 49#define CRVML_PANEL_PORT 0x38 50#define CRVML_LVDS_ON 0x00000001 51#define CRVML_PANEL_ON 0x00000002 52#define CRVML_BACKLIGHT_OFF 0x00000004 53 54/* The PLL Clock register sits on Host bridge */ 55#define CRVML_DEVICE_MCH 0x5001 56#define CRVML_REG_MCHBAR 0x44 57#define CRVML_REG_MCHEN 0x54 58#define CRVML_MCHEN_BIT (1 << 28) 59#define CRVML_MCHMAP_SIZE 4096 60#define CRVML_REG_CLOCK 0xc3c 61#define CRVML_CLOCK_SHIFT 8 62#define CRVML_CLOCK_MASK 0x00000f00 63 64static struct pci_dev *lpc_dev; 65static u32 gpio_bar; 66 67struct cr_panel { 68 struct backlight_device *cr_backlight_device; 69 struct lcd_device *cr_lcd_device; 70}; 71 72static int cr_backlight_set_intensity(struct backlight_device *bd) 73{ 74 int intensity = bd->props.brightness; 75 u32 addr = gpio_bar + CRVML_PANEL_PORT; 76 u32 cur = inl(addr); 77 78 if (bd->props.power == FB_BLANK_UNBLANK) 79 intensity = FB_BLANK_UNBLANK; 80 if (bd->props.fb_blank == FB_BLANK_UNBLANK) 81 intensity = FB_BLANK_UNBLANK; 82 if (bd->props.power == FB_BLANK_POWERDOWN) 83 intensity = FB_BLANK_POWERDOWN; 84 if (bd->props.fb_blank == FB_BLANK_POWERDOWN) 85 intensity = FB_BLANK_POWERDOWN; 86 87 if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */ 88 cur &= ~CRVML_BACKLIGHT_OFF; 89 outl(cur, addr); 90 } else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */ 91 cur |= CRVML_BACKLIGHT_OFF; 92 outl(cur, addr); 93 } /* anything else, don't bother */ 94 95 return 0; 96} 97 98static int cr_backlight_get_intensity(struct backlight_device *bd) 99{ 100 u32 addr = gpio_bar + CRVML_PANEL_PORT; 101 u32 cur = inl(addr); 102 u8 intensity; 103 104 if (cur & CRVML_BACKLIGHT_OFF) 105 intensity = FB_BLANK_POWERDOWN; 106 else 107 intensity = FB_BLANK_UNBLANK; 108 109 return intensity; 110} 111 112static const struct backlight_ops cr_backlight_ops = { 113 .get_brightness = cr_backlight_get_intensity, 114 .update_status = cr_backlight_set_intensity, 115}; 116 117static void cr_panel_on(void) 118{ 119 u32 addr = gpio_bar + CRVML_PANEL_PORT; 120 u32 cur = inl(addr); 121 122 if (!(cur & CRVML_PANEL_ON)) { 123 /* Make sure LVDS controller is down. */ 124 if (cur & 0x00000001) { 125 cur &= ~CRVML_LVDS_ON; 126 outl(cur, addr); 127 } 128 /* Power up Panel */ 129 schedule_timeout(HZ / 10); 130 cur |= CRVML_PANEL_ON; 131 outl(cur, addr); 132 } 133 134 /* Power up LVDS controller */ 135 136 if (!(cur & CRVML_LVDS_ON)) { 137 schedule_timeout(HZ / 10); 138 outl(cur | CRVML_LVDS_ON, addr); 139 } 140} 141 142static void cr_panel_off(void) 143{ 144 u32 addr = gpio_bar + CRVML_PANEL_PORT; 145 u32 cur = inl(addr); 146 147 /* Power down LVDS controller first to avoid high currents */ 148 if (cur & CRVML_LVDS_ON) { 149 cur &= ~CRVML_LVDS_ON; 150 outl(cur, addr); 151 } 152 if (cur & CRVML_PANEL_ON) { 153 schedule_timeout(HZ / 10); 154 outl(cur & ~CRVML_PANEL_ON, addr); 155 } 156} 157 158static int cr_lcd_set_power(struct lcd_device *ld, int power) 159{ 160 if (power == FB_BLANK_UNBLANK) 161 cr_panel_on(); 162 if (power == FB_BLANK_POWERDOWN) 163 cr_panel_off(); 164 165 return 0; 166} 167 168static struct lcd_ops cr_lcd_ops = { 169 .set_power = cr_lcd_set_power, 170}; 171 172static int cr_backlight_probe(struct platform_device *pdev) 173{ 174 struct backlight_properties props; 175 struct backlight_device *bdp; 176 struct lcd_device *ldp; 177 struct cr_panel *crp; 178 u8 dev_en; 179 180 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 181 CRVML_DEVICE_LPC, NULL); 182 if (!lpc_dev) { 183 printk("INTEL CARILLO RANCH LPC not found.\n"); 184 return -ENODEV; 185 } 186 187 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); 188 if (!(dev_en & CRVML_GPIOEN_BIT)) { 189 printk(KERN_ERR 190 "Carillo Ranch GPIO device was not enabled.\n"); 191 pci_dev_put(lpc_dev); 192 return -ENODEV; 193 } 194 195 memset(&props, 0, sizeof(struct backlight_properties)); 196 bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL, 197 &cr_backlight_ops, &props); 198 if (IS_ERR(bdp)) { 199 pci_dev_put(lpc_dev); 200 return PTR_ERR(bdp); 201 } 202 203 ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops); 204 if (IS_ERR(ldp)) { 205 backlight_device_unregister(bdp); 206 pci_dev_put(lpc_dev); 207 return PTR_ERR(ldp); 208 } 209 210 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, 211 &gpio_bar); 212 gpio_bar &= ~0x3F; 213 214 crp = kzalloc(sizeof(*crp), GFP_KERNEL); 215 if (!crp) { 216 lcd_device_unregister(ldp); 217 backlight_device_unregister(bdp); 218 pci_dev_put(lpc_dev); 219 return -ENOMEM; 220 } 221 222 crp->cr_backlight_device = bdp; 223 crp->cr_lcd_device = ldp; 224 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; 225 crp->cr_backlight_device->props.brightness = 0; 226 cr_backlight_set_intensity(crp->cr_backlight_device); 227 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); 228 229 platform_set_drvdata(pdev, crp); 230 231 return 0; 232} 233 234static int cr_backlight_remove(struct platform_device *pdev) 235{ 236 struct cr_panel *crp = platform_get_drvdata(pdev); 237 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; 238 crp->cr_backlight_device->props.brightness = 0; 239 crp->cr_backlight_device->props.max_brightness = 0; 240 cr_backlight_set_intensity(crp->cr_backlight_device); 241 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); 242 backlight_device_unregister(crp->cr_backlight_device); 243 lcd_device_unregister(crp->cr_lcd_device); 244 pci_dev_put(lpc_dev); 245 246 return 0; 247} 248 249static struct platform_driver cr_backlight_driver = { 250 .probe = cr_backlight_probe, 251 .remove = cr_backlight_remove, 252 .driver = { 253 .name = "cr_backlight", 254 }, 255}; 256 257static struct platform_device *crp; 258 259static int __init cr_backlight_init(void) 260{ 261 int ret = platform_driver_register(&cr_backlight_driver); 262 263 if (ret) 264 return ret; 265 266 crp = platform_device_register_simple("cr_backlight", -1, NULL, 0); 267 if (IS_ERR(crp)) { 268 platform_driver_unregister(&cr_backlight_driver); 269 return PTR_ERR(crp); 270 } 271 272 printk("Carillo Ranch Backlight Driver Initialized.\n"); 273 274 return 0; 275} 276 277static void __exit cr_backlight_exit(void) 278{ 279 platform_device_unregister(crp); 280 platform_driver_unregister(&cr_backlight_driver); 281} 282 283module_init(cr_backlight_init); 284module_exit(cr_backlight_exit); 285 286MODULE_AUTHOR("Tungsten Graphics Inc."); 287MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); 288MODULE_LICENSE("GPL"); 289