1 // SPDX-License-Identifier: MIT
13  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
24 #include <linux/i2c-algo-bit.h>
43 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_setsda()
48 		ujcrb7 = ((state & 0x01) ? 0 : 1) << 2;  in ast_ddc_algo_bit_data_setsda()
59 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_setscl()
64 		ujcrb7 = ((state & 0x01) ? 0 : 1);  in ast_ddc_algo_bit_data_setscl()
75 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_pre_xfer()
79 	 * by acquiring the I/O-register lock.  in ast_ddc_algo_bit_data_pre_xfer()
81 	mutex_lock(&ast->modeset_lock);  in ast_ddc_algo_bit_data_pre_xfer()
89 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_post_xfer()
91 	mutex_unlock(&ast->modeset_lock);  in ast_ddc_algo_bit_data_post_xfer()
97 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_getsda()
98 	uint32_t val, val2, count, pass;  in ast_ddc_algo_bit_data_getsda()  local
101 	pass = 0;  in ast_ddc_algo_bit_data_getsda()
106 			pass++;  in ast_ddc_algo_bit_data_getsda()
108 			pass = 0;  in ast_ddc_algo_bit_data_getsda()
111 	} while ((pass < 5) && (count++ < 0x10000));  in ast_ddc_algo_bit_data_getsda()
113 	return val & 1 ? 1 : 0;  in ast_ddc_algo_bit_data_getsda()
119 	struct ast_device *ast = ddc->ast;  in ast_ddc_algo_bit_data_getscl()
120 	uint32_t val, val2, count, pass;  in ast_ddc_algo_bit_data_getscl()  local
123 	pass = 0;  in ast_ddc_algo_bit_data_getscl()
128 			pass++;  in ast_ddc_algo_bit_data_getscl()
130 			pass = 0;  in ast_ddc_algo_bit_data_getscl()
133 	} while ((pass < 5) && (count++ < 0x10000));  in ast_ddc_algo_bit_data_getscl()
135 	return val & 1 ? 1 : 0;  in ast_ddc_algo_bit_data_getscl()
142 	i2c_del_adapter(&ddc->adapter);  in ast_ddc_release()
147 	struct drm_device *dev = &ast->base;  in ast_ddc_create()
155 		return ERR_PTR(-ENOMEM);  in ast_ddc_create()
156 	ddc->ast = ast;  in ast_ddc_create()
158 	bit = &ddc->bit;  in ast_ddc_create()
159 	bit->data = ddc;  in ast_ddc_create()
160 	bit->setsda = ast_ddc_algo_bit_data_setsda;  in ast_ddc_create()
161 	bit->setscl = ast_ddc_algo_bit_data_setscl;  in ast_ddc_create()
162 	bit->getsda = ast_ddc_algo_bit_data_getsda;  in ast_ddc_create()
163 	bit->getscl = ast_ddc_algo_bit_data_getscl;  in ast_ddc_create()
164 	bit->pre_xfer = ast_ddc_algo_bit_data_pre_xfer;  in ast_ddc_create()
165 	bit->post_xfer = ast_ddc_algo_bit_data_post_xfer;  in ast_ddc_create()
166 	bit->udelay = 20;  in ast_ddc_create()
167 	bit->timeout = usecs_to_jiffies(2200);  in ast_ddc_create()
169 	adapter = &ddc->adapter;  in ast_ddc_create()
170 	adapter->owner = THIS_MODULE;  in ast_ddc_create()
171 	adapter->algo_data = bit;  in ast_ddc_create()
172 	adapter->dev.parent = dev->dev;  in ast_ddc_create()
173 	snprintf(adapter->name, sizeof(adapter->name), "AST DDC bus");  in ast_ddc_create()
186 	return &ddc->adapter;  in ast_ddc_create()