1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450. 5 * 6 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz> 7 * 8 * Version: 1.64 2002/06/10 9 * 10 * See matroxfb_base.c for contributors. 11 * 12 */ 13 14 #include "matroxfb_base.h" 15 #include "matroxfb_maven.h" 16 #include <linux/i2c.h> 17 #include <linux/slab.h> 18 #include <linux/i2c-algo-bit.h> 19 20 /* MGA-TVO I2C for G200, G400 */ 21 #define MAT_CLK 0x20 22 #define MAT_DATA 0x10 23 /* primary head DDC for Mystique(?), G100, G200, G400 */ 24 #define DDC1_CLK 0x08 25 #define DDC1_DATA 0x02 26 /* primary head DDC for Millennium, Millennium II */ 27 #define DDC1B_CLK 0x10 28 #define DDC1B_DATA 0x04 29 /* secondary head DDC for G400 */ 30 #define DDC2_CLK 0x04 31 #define DDC2_DATA 0x01 32 33 /******************************************************/ 34 35 struct matroxfb_dh_maven_info { 36 struct i2c_bit_adapter maven; 37 struct i2c_bit_adapter ddc1; 38 struct i2c_bit_adapter ddc2; 39 }; 40 41 static int matroxfb_read_gpio(struct matrox_fb_info* minfo) { 42 unsigned long flags; 43 int v; 44 45 matroxfb_DAC_lock_irqsave(flags); 46 v = matroxfb_DAC_in(minfo, DAC_XGENIODATA); 47 matroxfb_DAC_unlock_irqrestore(flags); 48 return v; 49 } 50 51 static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) { 52 unsigned long flags; 53 int v; 54 55 matroxfb_DAC_lock_irqsave(flags); 56 v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val; 57 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v); 58 /* We must reset GENIODATA very often... XFree plays with this register */ 59 matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00); 60 matroxfb_DAC_unlock_irqrestore(flags); 61 } 62 63 /* software I2C functions */ 64 static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) { 65 if (state) 66 state = 0; 67 else 68 state = mask; 69 matroxfb_set_gpio(minfo, ~mask, state); 70 } 71 72 static void matroxfb_gpio_setsda(void* data, int state) { 73 struct i2c_bit_adapter* b = data; 74 matroxfb_i2c_set(b->minfo, b->mask.data, state); 75 } 76 77 static void matroxfb_gpio_setscl(void* data, int state) { 78 struct i2c_bit_adapter* b = data; 79 matroxfb_i2c_set(b->minfo, b->mask.clock, state); 80 } 81 82 static int matroxfb_gpio_getsda(void* data) { 83 struct i2c_bit_adapter* b = data; 84 return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0; 85 } 86 87 static int matroxfb_gpio_getscl(void* data) { 88 struct i2c_bit_adapter* b = data; 89 return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0; 90 } 91 92 static const struct i2c_algo_bit_data matrox_i2c_algo_template = 93 { 94 .setsda = matroxfb_gpio_setsda, 95 .setscl = matroxfb_gpio_setscl, 96 .getsda = matroxfb_gpio_getsda, 97 .getscl = matroxfb_gpio_getscl, 98 .udelay = 10, 99 .timeout = 100, 100 }; 101 102 static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 103 unsigned int data, unsigned int clock, const char *name, 104 int class) 105 { 106 int err; 107 108 b->minfo = minfo; 109 b->mask.data = data; 110 b->mask.clock = clock; 111 b->adapter.owner = THIS_MODULE; 112 snprintf(b->adapter.name, sizeof(b->adapter.name), name, 113 minfo->fbcon.node); 114 i2c_set_adapdata(&b->adapter, b); 115 b->adapter.class = class; 116 b->adapter.algo_data = &b->bac; 117 b->adapter.dev.parent = &minfo->pcidev->dev; 118 b->bac = matrox_i2c_algo_template; 119 b->bac.data = b; 120 err = i2c_bit_add_bus(&b->adapter); 121 b->initialized = !err; 122 return err; 123 } 124 125 static void i2c_bit_bus_del(struct i2c_bit_adapter* b) { 126 if (b->initialized) { 127 i2c_del_adapter(&b->adapter); 128 b->initialized = 0; 129 } 130 } 131 132 static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) { 133 i2c_bit_bus_del(&minfo2->maven); 134 } 135 136 static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) { 137 i2c_bit_bus_del(&minfo2->ddc1); 138 } 139 140 static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) { 141 i2c_bit_bus_del(&minfo2->ddc2); 142 } 143 144 static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) { 145 int err; 146 unsigned long flags; 147 struct matroxfb_dh_maven_info* m2info; 148 149 m2info = kzalloc(sizeof(*m2info), GFP_KERNEL); 150 if (!m2info) 151 return NULL; 152 153 matroxfb_DAC_lock_irqsave(flags); 154 matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF); 155 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00); 156 matroxfb_DAC_unlock_irqrestore(flags); 157 158 switch (minfo->chip) { 159 case MGA_2064: 160 case MGA_2164: 161 err = i2c_bus_reg(&m2info->ddc1, minfo, 162 DDC1B_DATA, DDC1B_CLK, 163 "DDC:fb%u #0", I2C_CLASS_DDC); 164 break; 165 default: 166 err = i2c_bus_reg(&m2info->ddc1, minfo, 167 DDC1_DATA, DDC1_CLK, 168 "DDC:fb%u #0", I2C_CLASS_DDC); 169 break; 170 } 171 if (err) 172 goto fail_ddc1; 173 if (minfo->devflags.dualhead) { 174 err = i2c_bus_reg(&m2info->ddc2, minfo, 175 DDC2_DATA, DDC2_CLK, 176 "DDC:fb%u #1", I2C_CLASS_DDC); 177 if (err == -ENODEV) { 178 printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n"); 179 } else if (err) 180 printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n"); 181 /* Register maven bus even on G450/G550 */ 182 err = i2c_bus_reg(&m2info->maven, minfo, 183 MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0); 184 if (err) 185 printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n"); 186 else { 187 struct i2c_board_info maven_info = { 188 I2C_BOARD_INFO("maven", 0x1b), 189 }; 190 unsigned short const addr_list[2] = { 191 0x1b, I2C_CLIENT_END 192 }; 193 194 i2c_new_scanned_device(&m2info->maven.adapter, 195 &maven_info, addr_list, NULL); 196 } 197 } 198 return m2info; 199 fail_ddc1:; 200 kfree(m2info); 201 printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n"); 202 return NULL; 203 } 204 205 static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) { 206 struct matroxfb_dh_maven_info* m2info = data; 207 208 i2c_maven_done(m2info); 209 i2c_ddc2_done(m2info); 210 i2c_ddc1_done(m2info); 211 kfree(m2info); 212 } 213 214 static struct matroxfb_driver i2c_matroxfb = { 215 .node = LIST_HEAD_INIT(i2c_matroxfb.node), 216 .name = "i2c-matroxfb", 217 .probe = i2c_matroxfb_probe, 218 .remove = i2c_matroxfb_remove, 219 }; 220 221 static int __init i2c_matroxfb_init(void) { 222 if (matroxfb_register_driver(&i2c_matroxfb)) { 223 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n"); 224 return -ENXIO; 225 } 226 return 0; 227 } 228 229 static void __exit i2c_matroxfb_exit(void) { 230 matroxfb_unregister_driver(&i2c_matroxfb); 231 } 232 233 MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>"); 234 MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards"); 235 236 module_init(i2c_matroxfb_init); 237 module_exit(i2c_matroxfb_exit); 238 /* no __setup required */ 239 MODULE_LICENSE("GPL"); 240