4  * SPDX-License-Identifier: Apache-2.0
36 	const struct microchip_mcp7940n_bbram_config *config = dev->config;  in microchip_mcp7940n_bbram_init()
37 	struct microchip_mcp7940n_bbram_data *data = dev->data;  in microchip_mcp7940n_bbram_init()
39 	uint8_t buffer;  in microchip_mcp7940n_bbram_init()  local
41 	if (!device_is_ready(config->i2c.bus)) {  in microchip_mcp7940n_bbram_init()
42 		LOG_ERR("I2C device %s is not ready", config->i2c.bus->name);  in microchip_mcp7940n_bbram_init()
43 		return -ENODEV;  in microchip_mcp7940n_bbram_init()
46 	k_mutex_init(&data->lock);  in microchip_mcp7940n_bbram_init()
48 	rc = i2c_reg_read_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_init()
50 				  &buffer);  in microchip_mcp7940n_bbram_init()
59 static int microchip_mcp7940n_bbram_size(const struct device *dev, size_t *size)  in microchip_mcp7940n_bbram_size()  argument
61 	*size = MICROCHIP_MCP7940N_SRAM_SIZE;  in microchip_mcp7940n_bbram_size()
68 	const struct microchip_mcp7940n_bbram_config *config = dev->config;  in microchip_mcp7940n_bbram_is_invalid()
69 	struct microchip_mcp7940n_bbram_data *data = dev->data;  in microchip_mcp7940n_bbram_is_invalid()
71 	uint8_t buffer;  in microchip_mcp7940n_bbram_is_invalid()  local
74 	k_mutex_lock(&data->lock, K_FOREVER);  in microchip_mcp7940n_bbram_is_invalid()
76 	rc = i2c_reg_read_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_is_invalid()
78 				  &buffer);  in microchip_mcp7940n_bbram_is_invalid()
81 	if ((buffer & MICROCHIP_MCP7940N_RTCWKDAY_PWRFAIL_BIT)) {  in microchip_mcp7940n_bbram_is_invalid()
84 		buffer &= (buffer ^ MICROCHIP_MCP7940N_RTCWKDAY_PWRFAIL_BIT);  in microchip_mcp7940n_bbram_is_invalid()
86 		rc = i2c_reg_write_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_is_invalid()
88 					   buffer);  in microchip_mcp7940n_bbram_is_invalid()
98 	k_mutex_unlock(&data->lock);  in microchip_mcp7940n_bbram_is_invalid()
109 	const struct microchip_mcp7940n_bbram_config *config = dev->config;  in microchip_mcp7940n_bbram_check_standby_power()
110 	struct microchip_mcp7940n_bbram_data *data = dev->data;  in microchip_mcp7940n_bbram_check_standby_power()
112 	uint8_t buffer;  in microchip_mcp7940n_bbram_check_standby_power()  local
115 	k_mutex_lock(&data->lock, K_FOREVER);  in microchip_mcp7940n_bbram_check_standby_power()
117 	rc = i2c_reg_read_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_check_standby_power()
119 				  &buffer);  in microchip_mcp7940n_bbram_check_standby_power()
122 	if (!(buffer & MICROCHIP_MCP7940N_RTCWKDAY_VBATEN_BIT)) {  in microchip_mcp7940n_bbram_check_standby_power()
125 		buffer |= MICROCHIP_MCP7940N_RTCWKDAY_VBATEN_BIT;  in microchip_mcp7940n_bbram_check_standby_power()
127 		rc = i2c_reg_write_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_check_standby_power()
129 					   buffer);  in microchip_mcp7940n_bbram_check_standby_power()
139 	k_mutex_unlock(&data->lock);  in microchip_mcp7940n_bbram_check_standby_power()
148 static int microchip_mcp7940n_bbram_read(const struct device *dev, size_t offset, size_t size,  in microchip_mcp7940n_bbram_read()  argument
149 					 uint8_t *buffer)  in microchip_mcp7940n_bbram_read()  argument
151 	const struct microchip_mcp7940n_bbram_config *config = dev->config;  in microchip_mcp7940n_bbram_read()
152 	struct microchip_mcp7940n_bbram_data *data = dev->data;  in microchip_mcp7940n_bbram_read()
156 	if (size == 0 || (offset + size) > MICROCHIP_MCP7940N_SRAM_SIZE) {  in microchip_mcp7940n_bbram_read()
157 		return -EINVAL;  in microchip_mcp7940n_bbram_read()
160 	k_mutex_lock(&data->lock, K_FOREVER);  in microchip_mcp7940n_bbram_read()
162 	while (i < size) {  in microchip_mcp7940n_bbram_read()
164 		rc = i2c_reg_read_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_read()
166 					  &buffer[i]);  in microchip_mcp7940n_bbram_read()
176 	k_mutex_unlock(&data->lock);  in microchip_mcp7940n_bbram_read()
181 static int microchip_mcp7940n_bbram_write(const struct device *dev, size_t offset, size_t size,  in microchip_mcp7940n_bbram_write()  argument
182 					  const uint8_t *buffer)  in microchip_mcp7940n_bbram_write()  argument
184 	const struct microchip_mcp7940n_bbram_config *config = dev->config;  in microchip_mcp7940n_bbram_write()
185 	struct microchip_mcp7940n_bbram_data *data = dev->data;  in microchip_mcp7940n_bbram_write()
189 	if (size == 0 || (offset + size) > MICROCHIP_MCP7940N_SRAM_SIZE) {  in microchip_mcp7940n_bbram_write()
190 		return -EINVAL;  in microchip_mcp7940n_bbram_write()
193 	k_mutex_lock(&data->lock, K_FOREVER);  in microchip_mcp7940n_bbram_write()
195 	while (i < size) {  in microchip_mcp7940n_bbram_write()
196 		LOG_DBG("Write 0x%x to 0x%x", buffer[i],  in microchip_mcp7940n_bbram_write()
198 		rc = i2c_reg_write_byte_dt(&config->i2c,  in microchip_mcp7940n_bbram_write()
200 					   buffer[i]);  in microchip_mcp7940n_bbram_write()
210 	k_mutex_unlock(&data->lock);  in microchip_mcp7940n_bbram_write()