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 33 #include <drm/drm_pci.h> 34 35 #include "mgag200_drv.h" 36 37 static int mga_i2c_read_gpio(struct mga_device *mdev) 38 { 39 WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA); 40 return RREG8(DAC_DATA); 41 } 42 43 static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val) 44 { 45 int tmp; 46 47 WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL); 48 tmp = (RREG8(DAC_DATA) & mask) | val; 49 WREG_DAC(MGA1064_GEN_IO_CTL, tmp); 50 WREG_DAC(MGA1064_GEN_IO_DATA, 0); 51 } 52 53 static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state) 54 { 55 if (state) 56 state = 0; 57 else 58 state = mask; 59 mga_i2c_set_gpio(mdev, ~mask, state); 60 } 61 62 static void mga_gpio_setsda(void *data, int state) 63 { 64 struct mga_i2c_chan *i2c = data; 65 struct mga_device *mdev = i2c->dev->dev_private; 66 mga_i2c_set(mdev, i2c->data, state); 67 } 68 69 static void mga_gpio_setscl(void *data, int state) 70 { 71 struct mga_i2c_chan *i2c = data; 72 struct mga_device *mdev = i2c->dev->dev_private; 73 mga_i2c_set(mdev, i2c->clock, state); 74 } 75 76 static int mga_gpio_getsda(void *data) 77 { 78 struct mga_i2c_chan *i2c = data; 79 struct mga_device *mdev = i2c->dev->dev_private; 80 return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0; 81 } 82 83 static int mga_gpio_getscl(void *data) 84 { 85 struct mga_i2c_chan *i2c = data; 86 struct mga_device *mdev = i2c->dev->dev_private; 87 return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0; 88 } 89 90 struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev) 91 { 92 struct mga_device *mdev = dev->dev_private; 93 struct mga_i2c_chan *i2c; 94 int ret; 95 int data, clock; 96 97 WREG_DAC(MGA1064_GEN_IO_CTL2, 1); 98 WREG_DAC(MGA1064_GEN_IO_DATA, 0xff); 99 WREG_DAC(MGA1064_GEN_IO_CTL, 0); 100 101 switch (mdev->type) { 102 case G200_SE_A: 103 case G200_SE_B: 104 case G200_EV: 105 case G200_WB: 106 case G200_EW3: 107 data = 1; 108 clock = 2; 109 break; 110 case G200_EH: 111 case G200_EH3: 112 case G200_ER: 113 data = 2; 114 clock = 1; 115 break; 116 default: 117 data = 2; 118 clock = 8; 119 break; 120 } 121 122 i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL); 123 if (!i2c) 124 return NULL; 125 126 i2c->data = data; 127 i2c->clock = clock; 128 i2c->adapter.owner = THIS_MODULE; 129 i2c->adapter.class = I2C_CLASS_DDC; 130 i2c->adapter.dev.parent = &dev->pdev->dev; 131 i2c->dev = dev; 132 i2c_set_adapdata(&i2c->adapter, i2c); 133 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c"); 134 135 i2c->adapter.algo_data = &i2c->bit; 136 137 i2c->bit.udelay = 10; 138 i2c->bit.timeout = 2; 139 i2c->bit.data = i2c; 140 i2c->bit.setsda = mga_gpio_setsda; 141 i2c->bit.setscl = mga_gpio_setscl; 142 i2c->bit.getsda = mga_gpio_getsda; 143 i2c->bit.getscl = mga_gpio_getscl; 144 145 ret = i2c_bit_add_bus(&i2c->adapter); 146 if (ret) { 147 kfree(i2c); 148 i2c = NULL; 149 } 150 return i2c; 151 } 152 153 void mgag200_i2c_destroy(struct mga_i2c_chan *i2c) 154 { 155 if (!i2c) 156 return; 157 i2c_del_adapter(&i2c->adapter); 158 kfree(i2c); 159 } 160 161