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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/mfd/tps6594-spi.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/tps6594-spi.c')
-rw-r--r--drivers/mfd/tps6594-spi.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/mfd/tps6594-spi.c b/drivers/mfd/tps6594-spi.c
new file mode 100644
index 0000000000..f4b4f37f95
--- /dev/null
+++ b/drivers/mfd/tps6594-spi.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SPI access driver for TI TPS6594/TPS6593/LP8764 PMICs
+ *
+ * Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
+ */
+
+#include <linux/crc8.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/mfd/tps6594.h>
+
+#define TPS6594_SPI_PAGE_SHIFT 5
+#define TPS6594_SPI_READ_BIT BIT(4)
+
+static bool enable_crc;
+module_param(enable_crc, bool, 0444);
+MODULE_PARM_DESC(enable_crc, "Enable CRC feature for SPI interface");
+
+DECLARE_CRC8_TABLE(tps6594_spi_crc_table);
+
+static int tps6594_spi_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct spi_device *spi = context;
+ struct tps6594 *tps = spi_get_drvdata(spi);
+ u8 buf[4] = { 0 };
+ size_t count_rx = 1;
+ int ret;
+
+ buf[0] = reg;
+ buf[1] = TPS6594_REG_TO_PAGE(reg) << TPS6594_SPI_PAGE_SHIFT | TPS6594_SPI_READ_BIT;
+
+ if (tps->use_crc)
+ count_rx++;
+
+ ret = spi_write_then_read(spi, buf, 2, buf + 2, count_rx);
+ if (ret < 0)
+ return ret;
+
+ if (tps->use_crc && buf[3] != crc8(tps6594_spi_crc_table, buf, 3, CRC8_INIT_VALUE))
+ return -EIO;
+
+ *val = buf[2];
+
+ return 0;
+}
+
+static int tps6594_spi_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct spi_device *spi = context;
+ struct tps6594 *tps = spi_get_drvdata(spi);
+ u8 buf[4] = { 0 };
+ size_t count = 3;
+
+ buf[0] = reg;
+ buf[1] = TPS6594_REG_TO_PAGE(reg) << TPS6594_SPI_PAGE_SHIFT;
+ buf[2] = val;
+
+ if (tps->use_crc)
+ buf[3] = crc8(tps6594_spi_crc_table, buf, count++, CRC8_INIT_VALUE);
+
+ return spi_write(spi, buf, count);
+}
+
+static const struct regmap_config tps6594_spi_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .max_register = TPS6594_REG_DWD_FAIL_CNT_REG,
+ .volatile_reg = tps6594_is_volatile_reg,
+ .reg_read = tps6594_spi_reg_read,
+ .reg_write = tps6594_spi_reg_write,
+ .use_single_read = true,
+ .use_single_write = true,
+};
+
+static const struct of_device_id tps6594_spi_of_match_table[] = {
+ { .compatible = "ti,tps6594-q1", .data = (void *)TPS6594, },
+ { .compatible = "ti,tps6593-q1", .data = (void *)TPS6593, },
+ { .compatible = "ti,lp8764-q1", .data = (void *)LP8764, },
+ {}
+};
+MODULE_DEVICE_TABLE(of, tps6594_spi_of_match_table);
+
+static int tps6594_spi_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct tps6594 *tps;
+ const struct of_device_id *match;
+
+ tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
+ if (!tps)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, tps);
+
+ tps->dev = dev;
+ tps->reg = spi->chip_select;
+ tps->irq = spi->irq;
+
+ tps->regmap = devm_regmap_init(dev, NULL, spi, &tps6594_spi_regmap_config);
+ if (IS_ERR(tps->regmap))
+ return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");
+
+ match = of_match_device(tps6594_spi_of_match_table, dev);
+ if (!match)
+ return dev_err_probe(dev, -EINVAL, "Failed to find matching chip ID\n");
+ tps->chip_id = (unsigned long)match->data;
+
+ crc8_populate_msb(tps6594_spi_crc_table, TPS6594_CRC8_POLYNOMIAL);
+
+ return tps6594_device_init(tps, enable_crc);
+}
+
+static struct spi_driver tps6594_spi_driver = {
+ .driver = {
+ .name = "tps6594",
+ .of_match_table = tps6594_spi_of_match_table,
+ },
+ .probe = tps6594_spi_probe,
+};
+module_spi_driver(tps6594_spi_driver);
+
+MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
+MODULE_DESCRIPTION("TPS6594 SPI Interface Driver");
+MODULE_LICENSE("GPL");