1 // SPDX-License-Identifier: GPL-2.0-only
3  * drivers/media/i2c/ccs/ccs-reg-access.c
5  * Generic driver for MIPI CCS/SMIA/SMIA++ compliant camera sensors
8  * Copyright (C) 2011--2012 Nokia Corporation
17 #include "ccs.h"
18 #include "ccs-limits.h"
26 		dev_err(&client->dev, "this is a negative number\n");  in float_to_u32_mul_1000000()
34 		dev_err(&client->dev, "NaN or other special number\n");  in float_to_u32_mul_1000000()
49 	exp = ((int32_t)phloat >> 23) - 127;  in float_to_u32_mul_1000000()
51 	/* Extract mantissa, add missing '1' bit and it's in MHz */  in float_to_u32_mul_1000000()
55 		man >>= -exp;  in float_to_u32_mul_1000000()
68 		dev_warn(&client->dev, "value %u overflows!\n", val);  in ireal32_to_u32_mul_1000000()
78 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);  in ccs_reg_conv()
94  * Read a 8/16/32-bit i2c register.  The value is returned in 'val'.
95  * Returns zero if successful, or non-zero otherwise.
103 	rval = cci_read(sensor->regmap, reg, &__val, NULL);  in __ccs_read_addr()
121 		if (regs->addr + regs->len < CCS_REG_ADDR(reg) + width)  in __ccs_static_data_read_ro_reg()
124 		if (regs->addr > CCS_REG_ADDR(reg))  in __ccs_static_data_read_ro_reg()
127 		data = &regs->value[CCS_REG_ADDR(reg) - regs->addr];  in __ccs_static_data_read_ro_reg()
140 			WARN_ON(1);  in __ccs_static_data_read_ro_reg()
141 			return -EINVAL;  in __ccs_static_data_read_ro_reg()
147 	return -ENOENT;  in __ccs_static_data_read_ro_reg()
153 	if (!__ccs_static_data_read_ro_reg(sensor->sdata.sensor_read_only_regs,  in ccs_static_data_read_ro_reg()
154 					   sensor->sdata.num_sensor_read_only_regs,  in ccs_static_data_read_ro_reg()
158 	return __ccs_static_data_read_ro_reg(sensor->mdata.module_read_only_regs,  in ccs_static_data_read_ro_reg()
159 					     sensor->mdata.num_module_read_only_regs,  in ccs_static_data_read_ro_reg()
177 		if (rval == -ENOIOCTLCMD)  in ccs_read_addr_raw()
208  * Write to a 8/16-bit register.
209  * Returns zero if successful, or non-zero otherwise.
217 	if (rval == -ENOIOCTLCMD)  in ccs_write_addr()
224 		if (cci_write(sensor->regmap, reg, val, &rval))  in ccs_write_addr()
226 	} while (rval && --retries);  in ccs_write_addr()
236 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);  in ccs_write_data_regs()
240 		unsigned char *regdata = regs->value;  in ccs_write_data_regs()
244 		for (j = 0; j < regs->len; j += len, regdata += len) {  in ccs_write_data_regs()
245 			char printbuf[(MAX_WRITE_LEN << 1) +  in ccs_write_data_regs()
246 				      1 /* \0 */] = { 0 };  in ccs_write_data_regs()
250 			len = min(regs->len - j, MAX_WRITE_LEN);  in ccs_write_data_regs()
253 			dev_dbg(&client->dev,  in ccs_write_data_regs()
255 				regs->addr + j, printbuf);  in ccs_write_data_regs()
258 				rval = regmap_bulk_write(sensor->regmap,  in ccs_write_data_regs()
259 							 regs->addr + j,  in ccs_write_data_regs()
263 			} while (rval && --retries);  in ccs_write_data_regs()
266 				dev_err(&client->dev,  in ccs_write_data_regs()
268 					len, regs->addr + j);  in ccs_write_data_regs()