1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sub license, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 18 * USE OR OTHER DEALINGS IN THE SOFTWARE. 19 * 20 * The above copyright notice and this permission notice (including the 21 * next paragraph) shall be included in all copies or substantial portions 22 * of the Software. 23 * 24 */ 25 /* 26 * Authors: Dave Airlie <airlied@redhat.com> 27 */ 28 29 #include <linux/export.h> 30 #include <linux/i2c-algo-bit.h> 31 #include <linux/i2c.h> 32 #include <linux/pci.h> 33 34 #include "mgag200_drv.h" 35 36 static int mga_i2c_read_gpio(struct mga_device *mdev) 37 { 38 WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA); 39 return RREG8(DAC_DATA); 40 } 41 42 static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val) 43 { 44 int tmp; 45 46 WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL); 47 tmp = (RREG8(DAC_DATA) & mask) | val; 48 WREG_DAC(MGA1064_GEN_IO_CTL, tmp); 49 WREG_DAC(MGA1064_GEN_IO_DATA, 0); 50 } 51 52 static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state) 53 { 54 if (state) 55 state = 0; 56 else 57 state = mask; 58 mga_i2c_set_gpio(mdev, ~mask, state); 59 } 60 61 static void mga_gpio_setsda(void *data, int state) 62 { 63 struct mga_i2c_chan *i2c = data; 64 struct mga_device *mdev = i2c->dev->dev_private; 65 mga_i2c_set(mdev, i2c->data, state); 66 } 67 68 static void mga_gpio_setscl(void *data, int state) 69 { 70 struct mga_i2c_chan *i2c = data; 71 struct mga_device *mdev = i2c->dev->dev_private; 72 mga_i2c_set(mdev, i2c->clock, state); 73 } 74 75 static int mga_gpio_getsda(void *data) 76 { 77 struct mga_i2c_chan *i2c = data; 78 struct mga_device *mdev = i2c->dev->dev_private; 79 return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0; 80 } 81 82 static int mga_gpio_getscl(void *data) 83 { 84 struct mga_i2c_chan *i2c = data; 85 struct mga_device *mdev = i2c->dev->dev_private; 86 return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0; 87 } 88 89 struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev) 90 { 91 struct mga_device *mdev = dev->dev_private; 92 struct mga_i2c_chan *i2c; 93 int ret; 94 int data, clock; 95 96 WREG_DAC(MGA1064_GEN_IO_CTL2, 1); 97 WREG_DAC(MGA1064_GEN_IO_DATA, 0xff); 98 WREG_DAC(MGA1064_GEN_IO_CTL, 0); 99 100 switch (mdev->type) { 101 case G200_SE_A: 102 case G200_SE_B: 103 case G200_EV: 104 case G200_WB: 105 case G200_EW3: 106 data = 1; 107 clock = 2; 108 break; 109 case G200_EH: 110 case G200_EH3: 111 case G200_ER: 112 data = 2; 113 clock = 1; 114 break; 115 default: 116 data = 2; 117 clock = 8; 118 break; 119 } 120 121 i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL); 122 if (!i2c) 123 return NULL; 124 125 i2c->data = data; 126 i2c->clock = clock; 127 i2c->adapter.owner = THIS_MODULE; 128 i2c->adapter.class = I2C_CLASS_DDC; 129 i2c->adapter.dev.parent = &dev->pdev->dev; 130 i2c->dev = dev; 131 i2c_set_adapdata(&i2c->adapter, i2c); 132 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c"); 133 134 i2c->adapter.algo_data = &i2c->bit; 135 136 i2c->bit.udelay = 10; 137 i2c->bit.timeout = 2; 138 i2c->bit.data = i2c; 139 i2c->bit.setsda = mga_gpio_setsda; 140 i2c->bit.setscl = mga_gpio_setscl; 141 i2c->bit.getsda = mga_gpio_getsda; 142 i2c->bit.getscl = mga_gpio_getscl; 143 144 ret = i2c_bit_add_bus(&i2c->adapter); 145 if (ret) { 146 kfree(i2c); 147 i2c = NULL; 148 } 149 return i2c; 150 } 151 152 void mgag200_i2c_destroy(struct mga_i2c_chan *i2c) 153 { 154 if (!i2c) 155 return; 156 i2c_del_adapter(&i2c->adapter); 157 kfree(i2c); 158 } 159 160