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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | // SPDX-License-Identifier: MIT /* * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. */ #include <drm/drm_managed.h> #include <drm/drm_print.h> #include "ast_drv.h" static void ast_i2c_setsda(void *i2c_priv, int data) { struct ast_i2c_chan *i2c = i2c_priv; struct ast_private *ast = to_ast_private(i2c->dev); int i; u8 ujcrb7, jtemp; for (i = 0; i < 0x10000; i++) { ujcrb7 = ((data & 0x01) ? 0 : 1) << 2; ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7); jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04); if (ujcrb7 == jtemp) break; } } static void ast_i2c_setscl(void *i2c_priv, int clock) { struct ast_i2c_chan *i2c = i2c_priv; struct ast_private *ast = to_ast_private(i2c->dev); int i; u8 ujcrb7, jtemp; for (i = 0; i < 0x10000; i++) { ujcrb7 = ((clock & 0x01) ? 0 : 1); ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7); jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01); if (ujcrb7 == jtemp) break; } } static int ast_i2c_getsda(void *i2c_priv) { struct ast_i2c_chan *i2c = i2c_priv; struct ast_private *ast = to_ast_private(i2c->dev); uint32_t val, val2, count, pass; count = 0; pass = 0; val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; do { val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; if (val == val2) { pass++; } else { pass = 0; val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01; } } while ((pass < 5) && (count++ < 0x10000)); return val & 1 ? 1 : 0; } static int ast_i2c_getscl(void *i2c_priv) { struct ast_i2c_chan *i2c = i2c_priv; struct ast_private *ast = to_ast_private(i2c->dev); uint32_t val, val2, count, pass; count = 0; pass = 0; val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; do { val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; if (val == val2) { pass++; } else { pass = 0; val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01; } } while ((pass < 5) && (count++ < 0x10000)); return val & 1 ? 1 : 0; } static void ast_i2c_release(struct drm_device *dev, void *res) { struct ast_i2c_chan *i2c = res; i2c_del_adapter(&i2c->adapter); kfree(i2c); } struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev) { struct ast_i2c_chan *i2c; int ret; i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL); if (!i2c) return NULL; i2c->adapter.owner = THIS_MODULE; i2c->adapter.class = I2C_CLASS_DDC; i2c->adapter.dev.parent = dev->dev; i2c->dev = dev; i2c_set_adapdata(&i2c->adapter, i2c); snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "AST i2c bit bus"); i2c->adapter.algo_data = &i2c->bit; i2c->bit.udelay = 20; i2c->bit.timeout = 2; i2c->bit.data = i2c; i2c->bit.setsda = ast_i2c_setsda; i2c->bit.setscl = ast_i2c_setscl; i2c->bit.getsda = ast_i2c_getsda; i2c->bit.getscl = ast_i2c_getscl; ret = i2c_bit_add_bus(&i2c->adapter); if (ret) { drm_err(dev, "Failed to register bit i2c\n"); goto out_kfree; } ret = drmm_add_action_or_reset(dev, ast_i2c_release, i2c); if (ret) return NULL; return i2c; out_kfree: kfree(i2c); return NULL; } |