1 // SPDX-License-Identifier: GPL-2.0
3  * I2C access driver for the following TI PMICs:
4  *  - LP8764
5  *  - TPS65224
6  *  - TPS652G1
7  *  - TPS6593
8  *  - TPS6594
10  * Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
14 #include <linux/i2c.h>
24 MODULE_PARM_DESC(enable_crc, "Enable CRC feature for I2C interface");
37 		return -EIO;  in tps6594_i2c_transfer()
44 	/* I2C address = I2C base address + Page index */  in tps6594_i2c_reg_read_with_crc()
45 	const u8 addr = client->addr + page;  in tps6594_i2c_reg_read_with_crc()
49 	 * - B0: (I2C_addr_7bits << 1) | WR_bit, with WR_bit = 0  in tps6594_i2c_reg_read_with_crc()
50 	 * - B1: reg  in tps6594_i2c_reg_read_with_crc()
51 	 * - B2: (I2C_addr_7bits << 1) | RD_bit, with RD_bit = 1  in tps6594_i2c_reg_read_with_crc()
52 	 * - B3: val  in tps6594_i2c_reg_read_with_crc()
53 	 * - B4: CRC from B0-B1-B2-B3  in tps6594_i2c_reg_read_with_crc()
70 	ret = tps6594_i2c_transfer(client->adapter, msgs, 2);  in tps6594_i2c_reg_read_with_crc()
74 	crc_data[sizeof(crc_data) - 1] = *val = buf_rx[0];  in tps6594_i2c_reg_read_with_crc()
76 		return -EIO;  in tps6594_i2c_reg_read_with_crc()
85 	/* I2C address = I2C base address + Page index */  in tps6594_i2c_reg_write_with_crc()
86 	const u8 addr = client->addr + page;  in tps6594_i2c_reg_write_with_crc()
90 	 * - B0: (I2C_addr_7bits << 1) | WR_bit, with WR_bit = 0  in tps6594_i2c_reg_write_with_crc()
91 	 * - B1: reg  in tps6594_i2c_reg_write_with_crc()
92 	 * - B2: val  in tps6594_i2c_reg_write_with_crc()
93 	 * - B3: CRC from B0-B1-B2  in tps6594_i2c_reg_write_with_crc()
99 	msg.flags = client->flags & I2C_M_TEN;  in tps6594_i2c_reg_write_with_crc()
103 	buf[msg.len - 1] = crc8(tps6594_i2c_crc_table, crc_data, sizeof(crc_data), CRC8_INIT_VALUE);  in tps6594_i2c_reg_write_with_crc()
105 	return tps6594_i2c_transfer(client->adapter, &msg, 1);  in tps6594_i2c_reg_write_with_crc()
121 	if (tps->use_crc) {  in tps6594_i2c_read()
123 		 * Auto-increment feature does not support CRC protocol.  in tps6594_i2c_read()
132 	/* Write register: I2C address = I2C base address + Page index */  in tps6594_i2c_read()
133 	msgs[0].addr = client->addr + page;  in tps6594_i2c_read()
144 	return tps6594_i2c_transfer(client->adapter, msgs, 2);  in tps6594_i2c_read()
159 	if (tps->use_crc) {  in tps6594_i2c_write()
161 		 * Auto-increment feature does not support CRC protocol.  in tps6594_i2c_write()
164 		for (i = 0 ; ret == 0 && i < count - 2 ; i++)  in tps6594_i2c_write()
171 	buf = kzalloc(--count, GFP_KERNEL);  in tps6594_i2c_write()
173 		return -ENOMEM;  in tps6594_i2c_write()
176 	for (i = 0 ; i < count - 1 ; i++)  in tps6594_i2c_write()
179 	/* Write register and data: I2C address = I2C base address + Page index */  in tps6594_i2c_write()
180 	msg.addr = client->addr + page;  in tps6594_i2c_write()
181 	msg.flags = client->flags & I2C_M_TEN;  in tps6594_i2c_write()
185 	ret = tps6594_i2c_transfer(client->adapter, &msg, 1);  in tps6594_i2c_write()
201 	{ .compatible = "ti,tps6594-q1", .data = (void *)TPS6594, },
202 	{ .compatible = "ti,tps6593-q1", .data = (void *)TPS6593, },
203 	{ .compatible = "ti,lp8764-q1",  .data = (void *)LP8764,  },
204 	{ .compatible = "ti,tps65224-q1", .data = (void *)TPS65224, },
212 	struct device *dev = &client->dev;  in tps6594_i2c_probe()
218 		return -ENOMEM;  in tps6594_i2c_probe()
222 	tps->dev = dev;  in tps6594_i2c_probe()
223 	tps->reg = client->addr;  in tps6594_i2c_probe()
224 	tps->irq = client->irq;  in tps6594_i2c_probe()
228 		return dev_err_probe(dev, -EINVAL, "Failed to find matching chip ID\n");  in tps6594_i2c_probe()
229 	tps->chip_id = (unsigned long)match->data;  in tps6594_i2c_probe()
231 	if (tps->chip_id == TPS65224 || tps->chip_id == TPS652G1)  in tps6594_i2c_probe()
234 	tps->regmap = devm_regmap_init(dev, NULL, client, &tps6594_i2c_regmap_config);  in tps6594_i2c_probe()
235 	if (IS_ERR(tps->regmap))  in tps6594_i2c_probe()
236 		return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");  in tps6594_i2c_probe()
253 MODULE_DESCRIPTION("I2C Interface Driver for TPS65224, TPS6594/3, and LP8764");