130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SPI access driver for TI TPS6594/TPS6593/LP8764 PMICs
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*
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* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
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*/
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#include <linux/crc8.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <linux/mfd/tps6594.h>
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#define TPS6594_SPI_PAGE_SHIFT 5
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#define TPS6594_SPI_READ_BIT BIT(4)
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static bool enable_crc;
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module_param(enable_crc, bool, 0444);
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MODULE_PARM_DESC(enable_crc, "Enable CRC feature for SPI interface");
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DECLARE_CRC8_TABLE(tps6594_spi_crc_table);
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static int tps6594_spi_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct spi_device *spi = context;
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struct tps6594 *tps = spi_get_drvdata(spi);
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u8 buf[4] = { 0 };
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size_t count_rx = 1;
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int ret;
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buf[0] = reg;
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buf[1] = TPS6594_REG_TO_PAGE(reg) << TPS6594_SPI_PAGE_SHIFT | TPS6594_SPI_READ_BIT;
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if (tps->use_crc)
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count_rx++;
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ret = spi_write_then_read(spi, buf, 2, buf + 2, count_rx);
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if (ret < 0)
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return ret;
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if (tps->use_crc && buf[3] != crc8(tps6594_spi_crc_table, buf, 3, CRC8_INIT_VALUE))
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return -EIO;
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*val = buf[2];
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return 0;
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}
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static int tps6594_spi_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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struct spi_device *spi = context;
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struct tps6594 *tps = spi_get_drvdata(spi);
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u8 buf[4] = { 0 };
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size_t count = 3;
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buf[0] = reg;
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buf[1] = TPS6594_REG_TO_PAGE(reg) << TPS6594_SPI_PAGE_SHIFT;
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buf[2] = val;
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if (tps->use_crc)
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buf[3] = crc8(tps6594_spi_crc_table, buf, count++, CRC8_INIT_VALUE);
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return spi_write(spi, buf, count);
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}
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static const struct regmap_config tps6594_spi_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = TPS6594_REG_DWD_FAIL_CNT_REG,
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.volatile_reg = tps6594_is_volatile_reg,
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.reg_read = tps6594_spi_reg_read,
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.reg_write = tps6594_spi_reg_write,
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.use_single_read = true,
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.use_single_write = true,
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};
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static const struct of_device_id tps6594_spi_of_match_table[] = {
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{ .compatible = "ti,tps6594-q1", .data = (void *)TPS6594, },
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{ .compatible = "ti,tps6593-q1", .data = (void *)TPS6593, },
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{ .compatible = "ti,lp8764-q1", .data = (void *)LP8764, },
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{}
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};
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MODULE_DEVICE_TABLE(of, tps6594_spi_of_match_table);
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static int tps6594_spi_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct tps6594 *tps;
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const struct of_device_id *match;
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tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
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if (!tps)
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return -ENOMEM;
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spi_set_drvdata(spi, tps);
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tps->dev = dev;
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tps->reg = spi->chip_select;
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tps->irq = spi->irq;
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tps->regmap = devm_regmap_init(dev, NULL, spi, &tps6594_spi_regmap_config);
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if (IS_ERR(tps->regmap))
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return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");
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match = of_match_device(tps6594_spi_of_match_table, dev);
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if (!match)
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return dev_err_probe(dev, -EINVAL, "Failed to find matching chip ID\n");
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tps->chip_id = (unsigned long)match->data;
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crc8_populate_msb(tps6594_spi_crc_table, TPS6594_CRC8_POLYNOMIAL);
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return tps6594_device_init(tps, enable_crc);
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}
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static struct spi_driver tps6594_spi_driver = {
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.driver = {
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.name = "tps6594",
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.of_match_table = tps6594_spi_of_match_table,
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},
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.probe = tps6594_spi_probe,
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};
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module_spi_driver(tps6594_spi_driver);
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MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
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MODULE_DESCRIPTION("TPS6594 SPI Interface Driver");
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MODULE_LICENSE("GPL");
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