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 <asm/uaccess.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 64 static struct pci_dev *lpc_dev; 65 static u32 gpio_bar; 66 67 struct cr_panel { 68 struct backlight_device *cr_backlight_device; 69 struct lcd_device *cr_lcd_device; 70 }; 71 72 static 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 98 static 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 } 111 112 static struct backlight_ops cr_backlight_ops = { 113 .get_brightness = cr_backlight_get_intensity, 114 .update_status = cr_backlight_set_intensity, 115 }; 116 117 static 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 } 141 142 static 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 } 157 158 static 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 } 167 168 static struct lcd_ops cr_lcd_ops = { 169 .set_power = cr_lcd_set_power, 170 }; 171 172 static int cr_backlight_probe(struct platform_device *pdev) 173 { 174 struct cr_panel *crp; 175 u8 dev_en; 176 177 crp = kzalloc(sizeof(crp), GFP_KERNEL); 178 if (crp == NULL) 179 return -ENOMEM; 180 181 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 182 CRVML_DEVICE_LPC, NULL); 183 if (!lpc_dev) { 184 printk("INTEL CARILLO RANCH LPC not found.\n"); 185 return -ENODEV; 186 } 187 188 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); 189 if (!(dev_en & CRVML_GPIOEN_BIT)) { 190 printk(KERN_ERR 191 "Carillo Ranch GPIO device was not enabled.\n"); 192 pci_dev_put(lpc_dev); 193 return -ENODEV; 194 } 195 196 crp->cr_backlight_device = backlight_device_register("cr-backlight", 197 &pdev->dev, NULL, 198 &cr_backlight_ops); 199 if (IS_ERR(crp->cr_backlight_device)) { 200 pci_dev_put(lpc_dev); 201 return PTR_ERR(crp->cr_backlight_device); 202 } 203 204 crp->cr_lcd_device = lcd_device_register("cr-lcd", 205 &pdev->dev, 206 &cr_lcd_ops); 207 208 if (IS_ERR(crp->cr_lcd_device)) { 209 pci_dev_put(lpc_dev); 210 return PTR_ERR(crp->cr_backlight_device); 211 } 212 213 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, 214 &gpio_bar); 215 gpio_bar &= ~0x3F; 216 217 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; 218 crp->cr_backlight_device->props.brightness = 0; 219 crp->cr_backlight_device->props.max_brightness = 0; 220 cr_backlight_set_intensity(crp->cr_backlight_device); 221 222 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); 223 224 platform_set_drvdata(pdev, crp); 225 226 return 0; 227 } 228 229 static int cr_backlight_remove(struct platform_device *pdev) 230 { 231 struct cr_panel *crp = platform_get_drvdata(pdev); 232 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; 233 crp->cr_backlight_device->props.brightness = 0; 234 crp->cr_backlight_device->props.max_brightness = 0; 235 cr_backlight_set_intensity(crp->cr_backlight_device); 236 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); 237 backlight_device_unregister(crp->cr_backlight_device); 238 lcd_device_unregister(crp->cr_lcd_device); 239 pci_dev_put(lpc_dev); 240 241 return 0; 242 } 243 244 static struct platform_driver cr_backlight_driver = { 245 .probe = cr_backlight_probe, 246 .remove = cr_backlight_remove, 247 .driver = { 248 .name = "cr_backlight", 249 }, 250 }; 251 252 static struct platform_device *crp; 253 254 static int __init cr_backlight_init(void) 255 { 256 int ret = platform_driver_register(&cr_backlight_driver); 257 258 if (!ret) { 259 crp = platform_device_alloc("cr_backlight", -1); 260 if (!crp) 261 return -ENOMEM; 262 263 ret = platform_device_add(crp); 264 265 if (ret) { 266 platform_device_put(crp); 267 platform_driver_unregister(&cr_backlight_driver); 268 } 269 } 270 271 printk("Carillo Ranch Backlight Driver Initialized.\n"); 272 273 return ret; 274 } 275 276 static void __exit cr_backlight_exit(void) 277 { 278 platform_device_unregister(crp); 279 platform_driver_unregister(&cr_backlight_driver); 280 } 281 282 module_init(cr_backlight_init); 283 module_exit(cr_backlight_exit); 284 285 MODULE_AUTHOR("Tungsten Graphics Inc."); 286 MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); 287 MODULE_LICENSE("GPL"); 288