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+/*
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+ * (C) Copyright 2013
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+ * Viktar Palstsiuk, Promwad, viktar.palstsiuk@promwad.com
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+ *
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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+/*
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+ * Driver for Semtech SX151x SPI GPIO Expanders
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+ */
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+
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+#include <common.h>
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+#include <spi.h>
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+#include <sx151x.h>
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+
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+#ifndef CONFIG_SX151X_SPI_BUS
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+#define CONFIG_SX151X_SPI_BUS 0
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+#endif
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+
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+/*
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+ * The SX151x registers
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+ */
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+
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+#ifdef CONFIG_SX151X_GPIO_COUNT_8
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+/* 8bit: SX1511 */
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+#define SX151X_REG_DIR 0x07
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+#define SX151X_REG_DATA 0x08
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+#else
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+/* 16bit: SX1512 */
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+#define SX151X_REG_DIR 0x0F
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+#define SX151X_REG_DATA 0x11
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+#endif
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+#define SX151X_REG_RESET 0x7D
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+
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+static int sx151x_spi_write(int chip, unsigned char reg, unsigned char val)
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+{
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+ struct spi_slave *slave;
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+ unsigned char buf[2];
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+ int ret;
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+
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+ slave = spi_setup_slave(CONFIG_SX151X_SPI_BUS, chip, 1000000,
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+ SPI_MODE_0);
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+ if (!slave)
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+ return 0;
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+
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+ spi_claim_bus(slave);
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+
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+ buf[0] = reg;
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+ buf[1] = val;
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+
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+ ret = spi_xfer(slave, 16, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END);
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+ if (ret < 0)
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+ printf("spi%d.%d write fail: can't write %02x to %02x: %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, val, reg, ret);
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+ else
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+ printf("spi%d.%d write 0x%02x to register 0x%02x\n",
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+ CONFIG_SX151X_SPI_BUS, chip, val, reg);
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+ spi_release_bus(slave);
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+ spi_free_slave(slave);
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+
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+ return ret;
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+}
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+
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+static int sx151x_spi_read(int chip, unsigned char reg)
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+{
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+ struct spi_slave *slave;
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+ int ret;
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+
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+ slave = spi_setup_slave(CONFIG_SX151X_SPI_BUS, chip, 1000000,
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+ SPI_MODE_0);
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+ if (!slave)
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+ return 0;
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+
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+ spi_claim_bus(slave);
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+
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+ ret = spi_w8r8(slave, reg | 0x80);
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+ if (ret < 0)
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+ printf("spi%d.%d read fail: can't read %02x: %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, reg, ret);
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+ else
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+ printf("spi%d.%d read register 0x%02x: 0x%02x\n",
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+ CONFIG_SX151X_SPI_BUS, chip, reg, ret);
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+
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+ spi_release_bus(slave);
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+ spi_free_slave(slave);
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+
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+ return ret;
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+}
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+
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+static inline void sx151x_find_cfg(int gpio, unsigned char *reg, unsigned char *mask)
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+{
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+ *reg -= gpio / 8;
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+ *mask = 1 << (gpio % 8);
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+}
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+
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+static int sx151x_write_cfg(int chip, unsigned char gpio, unsigned char reg, int val)
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+{
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+ unsigned char mask;
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+ unsigned char data;
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+ int ret;
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+
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+ sx151x_find_cfg(gpio, ®, &mask);
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+ ret = sx151x_spi_read(chip, reg);
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+ if (ret < 0)
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+ return ret;
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+ else
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+ data = ret;
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+ data &= ~mask;
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+ data |= (val << (gpio % 8)) & mask;
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+ return sx151x_spi_write(chip, reg, data);
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+}
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+
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+int sx151x_get_value(int chip, int gpio)
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+{
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+ unsigned char reg = SX151X_REG_DATA;
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+ unsigned char mask;
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+ int ret;
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+
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+ sx151x_find_cfg(gpio, ®, &mask);
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+ ret = sx151x_spi_read(chip, reg);
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+ if (ret >= 0)
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+ ret = (ret & mask) != 0 ? 1 : 0;
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+
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+ return ret;
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+}
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+
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+int sx151x_set_value(int chip, int gpio, int val)
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+{
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+ return sx151x_write_cfg(chip, gpio, SX151X_REG_DATA, (val ? 1 : 0));
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+}
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+
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+int sx151x_direction_input(int chip, int gpio)
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+{
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+ return sx151x_write_cfg(chip, gpio, SX151X_REG_DIR, 1);
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+}
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+
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+int sx151x_direction_output(int chip, int gpio)
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+{
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+ return sx151x_write_cfg(chip, gpio, SX151X_REG_DIR, 0);
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+}
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+
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+int sx151x_reset(int chip)
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+{
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+ int err;
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+
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+ err = sx151x_spi_write(chip, SX151X_REG_RESET, 0x12);
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+ if (err < 0)
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+ return err;
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+
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+ err = sx151x_spi_write(chip, SX151X_REG_RESET, 0x34);
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+ return err;
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+}
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+
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+#ifdef CONFIG_CMD_SX151X
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+
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+int do_sx151x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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+{
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+ int ret = CMD_RET_USAGE, chip = 0, gpio = 0, val = 0;
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+
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+ if (argc < 3)
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+ return CMD_RET_USAGE;
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+
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+ /* arg2 used as chip number */
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+ chip = simple_strtoul(argv[2], NULL, 10);
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+
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+ if (strcmp(argv[1], "reset") == 0) {
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+ ret = sx151x_reset(chip);
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+ if (!ret) {
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+ printf("Device at spi%d.%d was reset\n",
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+ CONFIG_SX151X_SPI_BUS, chip);
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+ }
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+ return ret;
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+ }
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+
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+ if (argc < 4)
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+ return CMD_RET_USAGE;
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+
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+ /* arg3 used as gpio number */
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+ gpio = simple_strtoul(argv[3], NULL, 10);
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+
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+ if (strcmp(argv[1], "get") == 0) {
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+ ret = sx151x_get_value(chip, gpio);
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+ if (ret < 0)
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+ printf("Failed to get value at spi%d.%d gpio %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio);
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+ else {
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+ printf("Value at spi%d.%d gpio %d is %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio, ret);
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+ ret = 0;
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+ }
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+ return ret;
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+ }
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+
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+ if (argc < 5)
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+ return CMD_RET_USAGE;
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+
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+ /* arg4 used as value or direction */
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+ val = simple_strtoul(argv[4], NULL, 10);
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+
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+ if (strcmp(argv[1], "set") == 0) {
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+ ret = sx151x_set_value(chip, gpio, val);
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+ if (ret < 0)
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+ printf("Failed to set value at spi%d.%d gpio %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio);
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+ else
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+ printf("New value at spi%d.%d gpio %d is %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio, val);
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+ return ret;
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+ } else if (strcmp(argv[1], "dir") == 0) {
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+ if (val == 0)
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+ ret = sx151x_direction_output(chip, gpio);
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+ else
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+ ret = sx151x_direction_input(chip, gpio);
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+
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+ if (ret < 0)
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+ printf("Failed to set direction of spi%d.%d gpio %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio);
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+ else
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+ printf("New direction of spi%d.%d gpio %d is %d\n",
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+ CONFIG_SX151X_SPI_BUS, chip, gpio, val);
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+ return ret;
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+ }
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+
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+ printf("Please see usage\n");
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+
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+ return ret;
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+}
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+
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+U_BOOT_CMD(
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+ sx151x, 5, 1, do_sx151x,
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+ "sx151x gpio access",
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+ "dir chip gpio 0|1\n"
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+ " - set gpio direction (0 for output, 1 for input)\n"
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+ "sx151x get chip gpio\n"
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+ " - get gpio value\n"
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+ "sx151x set chip gpio 0|1\n"
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+ " - set gpio value\n"
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+ "sx151x reset chip\n"
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+ " - reset chip"
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+);
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+
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+#endif /* CONFIG_CMD_SX151X */
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