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 40 /* The LVDS- and panel power controls sits on the 41 * GPIO port of the ISA bridge. 42 */ 43 44 #define CRVML_DEVICE_LPC 0x27B8 45 #define CRVML_REG_GPIOBAR 0x48 46 #define CRVML_REG_GPIOEN 0x4C 47 #define CRVML_GPIOEN_BIT (1 << 4) 48 #define CRVML_PANEL_PORT 0x38 49 #define CRVML_LVDS_ON 0x00000001 50 #define CRVML_PANEL_ON 0x00000002 51 #define CRVML_BACKLIGHT_OFF 0x00000004 52 53 /* The PLL Clock register sits on Host bridge */ 54 #define CRVML_DEVICE_MCH 0x5001 55 #define CRVML_REG_MCHBAR 0x44 56 #define CRVML_REG_MCHEN 0x54 57 #define CRVML_MCHEN_BIT (1 << 28) 58 #define CRVML_MCHMAP_SIZE 4096 59 #define CRVML_REG_CLOCK 0xc3c 60 #define CRVML_CLOCK_SHIFT 8 61 #define CRVML_CLOCK_MASK 0x00000f00 62 63 static struct pci_dev *lpc_dev; 64 static u32 gpio_bar; 65 66 struct cr_panel { 67 struct backlight_device *cr_backlight_device; 68 struct lcd_device *cr_lcd_device; 69 }; 70 71 static int cr_backlight_set_intensity(struct backlight_device *bd) 72 { 73 int intensity = bd->props.brightness; 74 u32 addr = gpio_bar + CRVML_PANEL_PORT; 75 u32 cur = inl(addr); 76 77 if (bd->props.power == FB_BLANK_UNBLANK) 78 intensity = FB_BLANK_UNBLANK; 79 if (bd->props.fb_blank == FB_BLANK_UNBLANK) 80 intensity = FB_BLANK_UNBLANK; 81 if (bd->props.power == FB_BLANK_POWERDOWN) 82 intensity = FB_BLANK_POWERDOWN; 83 if (bd->props.fb_blank == FB_BLANK_POWERDOWN) 84 intensity = FB_BLANK_POWERDOWN; 85 86 if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */ 87 cur &= ~CRVML_BACKLIGHT_OFF; 88 outl(cur, addr); 89 } else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */ 90 cur |= CRVML_BACKLIGHT_OFF; 91 outl(cur, addr); 92 } /* anything else, don't bother */ 93 94 return 0; 95 } 96 97 static int cr_backlight_get_intensity(struct backlight_device *bd) 98 { 99 u32 addr = gpio_bar + CRVML_PANEL_PORT; 100 u32 cur = inl(addr); 101 u8 intensity; 102 103 if (cur & CRVML_BACKLIGHT_OFF) 104 intensity = FB_BLANK_POWERDOWN; 105 else 106 intensity = FB_BLANK_UNBLANK; 107 108 return intensity; 109 } 110 111 static const struct backlight_ops cr_backlight_ops = { 112 .get_brightness = cr_backlight_get_intensity, 113 .update_status = cr_backlight_set_intensity, 114 }; 115 116 static void cr_panel_on(void) 117 { 118 u32 addr = gpio_bar + CRVML_PANEL_PORT; 119 u32 cur = inl(addr); 120 121 if (!(cur & CRVML_PANEL_ON)) { 122 /* Make sure LVDS controller is down. */ 123 if (cur & 0x00000001) { 124 cur &= ~CRVML_LVDS_ON; 125 outl(cur, addr); 126 } 127 /* Power up Panel */ 128 schedule_timeout(HZ / 10); 129 cur |= CRVML_PANEL_ON; 130 outl(cur, addr); 131 } 132 133 /* Power up LVDS controller */ 134 135 if (!(cur & CRVML_LVDS_ON)) { 136 schedule_timeout(HZ / 10); 137 outl(cur | CRVML_LVDS_ON, addr); 138 } 139 } 140 141 static void cr_panel_off(void) 142 { 143 u32 addr = gpio_bar + CRVML_PANEL_PORT; 144 u32 cur = inl(addr); 145 146 /* Power down LVDS controller first to avoid high currents */ 147 if (cur & CRVML_LVDS_ON) { 148 cur &= ~CRVML_LVDS_ON; 149 outl(cur, addr); 150 } 151 if (cur & CRVML_PANEL_ON) { 152 schedule_timeout(HZ / 10); 153 outl(cur & ~CRVML_PANEL_ON, addr); 154 } 155 } 156 157 static int cr_lcd_set_power(struct lcd_device *ld, int power) 158 { 159 if (power == FB_BLANK_UNBLANK) 160 cr_panel_on(); 161 if (power == FB_BLANK_POWERDOWN) 162 cr_panel_off(); 163 164 return 0; 165 } 166 167 static struct lcd_ops cr_lcd_ops = { 168 .set_power = cr_lcd_set_power, 169 }; 170 171 static int cr_backlight_probe(struct platform_device *pdev) 172 { 173 struct backlight_device *bdp; 174 struct lcd_device *ldp; 175 struct cr_panel *crp; 176 u8 dev_en; 177 178 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 179 CRVML_DEVICE_LPC, NULL); 180 if (!lpc_dev) { 181 printk("INTEL CARILLO RANCH LPC not found.\n"); 182 return -ENODEV; 183 } 184 185 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); 186 if (!(dev_en & CRVML_GPIOEN_BIT)) { 187 printk(KERN_ERR 188 "Carillo Ranch GPIO device was not enabled.\n"); 189 pci_dev_put(lpc_dev); 190 return -ENODEV; 191 } 192 193 bdp = backlight_device_register("cr-backlight", 194 &pdev->dev, NULL, &cr_backlight_ops); 195 if (IS_ERR(bdp)) { 196 pci_dev_put(lpc_dev); 197 return PTR_ERR(bdp); 198 } 199 200 ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops); 201 if (IS_ERR(ldp)) { 202 backlight_device_unregister(bdp); 203 pci_dev_put(lpc_dev); 204 return PTR_ERR(bdp); 205 } 206 207 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, 208 &gpio_bar); 209 gpio_bar &= ~0x3F; 210 211 crp = kzalloc(sizeof(*crp), GFP_KERNEL); 212 if (!crp) { 213 lcd_device_unregister(ldp); 214 backlight_device_unregister(bdp); 215 pci_dev_put(lpc_dev); 216 return -ENOMEM; 217 } 218 219 crp->cr_backlight_device = bdp; 220 crp->cr_lcd_device = ldp; 221 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; 222 crp->cr_backlight_device->props.brightness = 0; 223 crp->cr_backlight_device->props.max_brightness = 0; 224 cr_backlight_set_intensity(crp->cr_backlight_device); 225 226 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); 227 228 platform_set_drvdata(pdev, crp); 229 230 return 0; 231 } 232 233 static int cr_backlight_remove(struct platform_device *pdev) 234 { 235 struct cr_panel *crp = platform_get_drvdata(pdev); 236 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; 237 crp->cr_backlight_device->props.brightness = 0; 238 crp->cr_backlight_device->props.max_brightness = 0; 239 cr_backlight_set_intensity(crp->cr_backlight_device); 240 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); 241 backlight_device_unregister(crp->cr_backlight_device); 242 lcd_device_unregister(crp->cr_lcd_device); 243 pci_dev_put(lpc_dev); 244 245 return 0; 246 } 247 248 static struct platform_driver cr_backlight_driver = { 249 .probe = cr_backlight_probe, 250 .remove = cr_backlight_remove, 251 .driver = { 252 .name = "cr_backlight", 253 }, 254 }; 255 256 static struct platform_device *crp; 257 258 static int __init cr_backlight_init(void) 259 { 260 int ret = platform_driver_register(&cr_backlight_driver); 261 262 if (ret) 263 return ret; 264 265 crp = platform_device_register_simple("cr_backlight", -1, NULL, 0); 266 if (IS_ERR(crp)) { 267 platform_driver_unregister(&cr_backlight_driver); 268 return PTR_ERR(crp); 269 } 270 271 printk("Carillo Ranch Backlight Driver Initialized.\n"); 272 273 return 0; 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