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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/module.h> 33 #include <linux/kernel.h> 34 #include <linux/init.h> 35 #include <linux/platform_device.h> 36 #include <linux/mutex.h> 37 #include <linux/fb.h> 38 #include <linux/backlight.h> 39 #include <linux/lcd.h> 40 #include <linux/pci.h> 41 #include <linux/slab.h> 42 43 /* The LVDS- and panel power controls sits on the 44 * GPIO port of the ISA bridge. 45 */ 46 47 #define CRVML_DEVICE_LPC 0x27B8 48 #define CRVML_REG_GPIOBAR 0x48 49 #define CRVML_REG_GPIOEN 0x4C 50 #define CRVML_GPIOEN_BIT (1 << 4) 51 #define CRVML_PANEL_PORT 0x38 52 #define CRVML_LVDS_ON 0x00000001 53 #define CRVML_PANEL_ON 0x00000002 54 #define CRVML_BACKLIGHT_OFF 0x00000004 55 56 /* The PLL Clock register sits on Host bridge */ 57 #define CRVML_DEVICE_MCH 0x5001 58 #define CRVML_REG_MCHBAR 0x44 59 #define CRVML_REG_MCHEN 0x54 60 #define CRVML_MCHEN_BIT (1 << 28) 61 #define CRVML_MCHMAP_SIZE 4096 62 #define CRVML_REG_CLOCK 0xc3c 63 #define CRVML_CLOCK_SHIFT 8 64 #define CRVML_CLOCK_MASK 0x00000f00 65 66 static struct pci_dev *lpc_dev; 67 static u32 gpio_bar; 68 69 struct cr_panel { 70 struct backlight_device *cr_backlight_device; 71 struct lcd_device *cr_lcd_device; 72 }; 73 74 static int cr_backlight_set_intensity(struct backlight_device *bd) 75 { 76 int intensity = bd->props.brightness; 77 u32 addr = gpio_bar + CRVML_PANEL_PORT; 78 u32 cur = inl(addr); 79 80 if (bd->props.power == FB_BLANK_UNBLANK) 81 intensity = FB_BLANK_UNBLANK; 82 if (bd->props.fb_blank == FB_BLANK_UNBLANK) 83 intensity = FB_BLANK_UNBLANK; 84 if (bd->props.power == FB_BLANK_POWERDOWN) 85 intensity = FB_BLANK_POWERDOWN; 86 if (bd->props.fb_blank == FB_BLANK_POWERDOWN) 87 intensity = FB_BLANK_POWERDOWN; 88 89 if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */ 90 cur &= ~CRVML_BACKLIGHT_OFF; 91 outl(cur, addr); 92 } else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */ 93 cur |= CRVML_BACKLIGHT_OFF; 94 outl(cur, addr); 95 } /* anything else, don't bother */ 96 97 return 0; 98 } 99 100 static int cr_backlight_get_intensity(struct backlight_device *bd) 101 { 102 u32 addr = gpio_bar + CRVML_PANEL_PORT; 103 u32 cur = inl(addr); 104 u8 intensity; 105 106 if (cur & CRVML_BACKLIGHT_OFF) 107 intensity = FB_BLANK_POWERDOWN; 108 else 109 intensity = FB_BLANK_UNBLANK; 110 111 return intensity; 112 } 113 114 static const struct backlight_ops cr_backlight_ops = { 115 .get_brightness = cr_backlight_get_intensity, 116 .update_status = cr_backlight_set_intensity, 117 }; 118 119 static void cr_panel_on(void) 120 { 121 u32 addr = gpio_bar + CRVML_PANEL_PORT; 122 u32 cur = inl(addr); 123 124 if (!(cur & CRVML_PANEL_ON)) { 125 /* Make sure LVDS controller is down. */ 126 if (cur & 0x00000001) { 127 cur &= ~CRVML_LVDS_ON; 128 outl(cur, addr); 129 } 130 /* Power up Panel */ 131 schedule_timeout(HZ / 10); 132 cur |= CRVML_PANEL_ON; 133 outl(cur, addr); 134 } 135 136 /* Power up LVDS controller */ 137 138 if (!(cur & CRVML_LVDS_ON)) { 139 schedule_timeout(HZ / 10); 140 outl(cur | CRVML_LVDS_ON, addr); 141 } 142 } 143 144 static void cr_panel_off(void) 145 { 146 u32 addr = gpio_bar + CRVML_PANEL_PORT; 147 u32 cur = inl(addr); 148 149 /* Power down LVDS controller first to avoid high currents */ 150 if (cur & CRVML_LVDS_ON) { 151 cur &= ~CRVML_LVDS_ON; 152 outl(cur, addr); 153 } 154 if (cur & CRVML_PANEL_ON) { 155 schedule_timeout(HZ / 10); 156 outl(cur & ~CRVML_PANEL_ON, addr); 157 } 158 } 159 160 static int cr_lcd_set_power(struct lcd_device *ld, int power) 161 { 162 if (power == FB_BLANK_UNBLANK) 163 cr_panel_on(); 164 if (power == FB_BLANK_POWERDOWN) 165 cr_panel_off(); 166 167 return 0; 168 } 169 170 static struct lcd_ops cr_lcd_ops = { 171 .set_power = cr_lcd_set_power, 172 }; 173 174 static int cr_backlight_probe(struct platform_device *pdev) 175 { 176 struct backlight_properties props; 177 struct backlight_device *bdp; 178 struct lcd_device *ldp; 179 struct cr_panel *crp; 180 u8 dev_en; 181 182 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 183 CRVML_DEVICE_LPC, NULL); 184 if (!lpc_dev) { 185 pr_err("INTEL CARILLO RANCH LPC not found.\n"); 186 return -ENODEV; 187 } 188 189 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); 190 if (!(dev_en & CRVML_GPIOEN_BIT)) { 191 pr_err("Carillo Ranch GPIO device was not enabled.\n"); 192 pci_dev_put(lpc_dev); 193 return -ENODEV; 194 } 195 196 memset(&props, 0, sizeof(struct backlight_properties)); 197 props.type = BACKLIGHT_RAW; 198 bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight", 199 &pdev->dev, NULL, &cr_backlight_ops, 200 &props); 201 if (IS_ERR(bdp)) { 202 pci_dev_put(lpc_dev); 203 return PTR_ERR(bdp); 204 } 205 206 ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL, 207 &cr_lcd_ops); 208 if (IS_ERR(ldp)) { 209 pci_dev_put(lpc_dev); 210 return PTR_ERR(ldp); 211 } 212 213 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, 214 &gpio_bar); 215 gpio_bar &= ~0x3F; 216 217 crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL); 218 if (!crp) { 219 pci_dev_put(lpc_dev); 220 return -ENOMEM; 221 } 222 223 crp->cr_backlight_device = bdp; 224 crp->cr_lcd_device = ldp; 225 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; 226 crp->cr_backlight_device->props.brightness = 0; 227 cr_backlight_set_intensity(crp->cr_backlight_device); 228 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); 229 230 platform_set_drvdata(pdev, crp); 231 232 return 0; 233 } 234 235 static int cr_backlight_remove(struct platform_device *pdev) 236 { 237 struct cr_panel *crp = platform_get_drvdata(pdev); 238 239 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; 240 crp->cr_backlight_device->props.brightness = 0; 241 crp->cr_backlight_device->props.max_brightness = 0; 242 cr_backlight_set_intensity(crp->cr_backlight_device); 243 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); 244 pci_dev_put(lpc_dev); 245 246 return 0; 247 } 248 249 static struct platform_driver cr_backlight_driver = { 250 .probe = cr_backlight_probe, 251 .remove = cr_backlight_remove, 252 .driver = { 253 .name = "cr_backlight", 254 }, 255 }; 256 257 static struct platform_device *crp; 258 259 static 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 pr_info("Carillo Ranch Backlight Driver Initialized.\n"); 273 274 return 0; 275 } 276 277 static void __exit cr_backlight_exit(void) 278 { 279 platform_device_unregister(crp); 280 platform_driver_unregister(&cr_backlight_driver); 281 } 282 283 module_init(cr_backlight_init); 284 module_exit(cr_backlight_exit); 285 286 MODULE_AUTHOR("Tungsten Graphics Inc."); 287 MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); 288 MODULE_LICENSE("GPL"); 289