161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 NovaTech LLC
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* George McCollister <george.mccollister@gmail.com>
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*/
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#include <linux/bits.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include "xrs700x.h"
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#include "xrs700x_reg.h"
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struct xrs700x_i2c_cmd {
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__be32 reg;
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__be16 val;
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} __packed;
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static int xrs700x_i2c_reg_read(void *context, unsigned int reg,
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unsigned int *val)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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struct xrs700x_i2c_cmd cmd;
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int ret;
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cmd.reg = cpu_to_be32(reg | 1);
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ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg));
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if (ret < 0) {
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dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
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return ret;
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}
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ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val));
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if (ret < 0) {
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dev_err(dev, "xrs i2c_master_recv returned %d\n", ret);
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return ret;
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}
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*val = be16_to_cpu(cmd.val);
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return 0;
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}
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static int xrs700x_i2c_reg_write(void *context, unsigned int reg,
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unsigned int val)
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{
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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struct xrs700x_i2c_cmd cmd;
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int ret;
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cmd.reg = cpu_to_be32(reg);
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cmd.val = cpu_to_be16(val);
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ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd));
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if (ret < 0) {
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dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct regmap_config xrs700x_i2c_regmap_config = {
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.val_bits = 16,
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.reg_stride = 2,
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.reg_bits = 32,
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.pad_bits = 0,
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.write_flag_mask = 0,
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.read_flag_mask = 0,
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.reg_read = xrs700x_i2c_reg_read,
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.reg_write = xrs700x_i2c_reg_write,
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.max_register = 0,
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.cache_type = REGCACHE_NONE,
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.reg_format_endian = REGMAP_ENDIAN_BIG,
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.val_format_endian = REGMAP_ENDIAN_BIG
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};
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static int xrs700x_i2c_probe(struct i2c_client *i2c)
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{
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struct xrs700x *priv;
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int ret;
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priv = xrs700x_switch_alloc(&i2c->dev, i2c);
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if (!priv)
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return -ENOMEM;
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priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
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&xrs700x_i2c_regmap_config);
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if (IS_ERR(priv->regmap)) {
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ret = PTR_ERR(priv->regmap);
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dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret);
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return ret;
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}
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i2c_set_clientdata(i2c, priv);
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ret = xrs700x_switch_register(priv);
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/* Main DSA driver may not be started yet. */
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if (ret)
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return ret;
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return 0;
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}
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static void xrs700x_i2c_remove(struct i2c_client *i2c)
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{
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struct xrs700x *priv = i2c_get_clientdata(i2c);
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if (!priv)
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return;
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xrs700x_switch_remove(priv);
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}
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static void xrs700x_i2c_shutdown(struct i2c_client *i2c)
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{
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struct xrs700x *priv = i2c_get_clientdata(i2c);
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if (!priv)
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return;
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xrs700x_switch_shutdown(priv);
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i2c_set_clientdata(i2c, NULL);
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}
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static const struct i2c_device_id xrs700x_i2c_id[] = {
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{ "xrs700x-switch", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id);
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static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = {
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{ .compatible = "arrow,xrs7003e", .data = &xrs7003e_info },
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{ .compatible = "arrow,xrs7003f", .data = &xrs7003f_info },
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{ .compatible = "arrow,xrs7004e", .data = &xrs7004e_info },
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{ .compatible = "arrow,xrs7004f", .data = &xrs7004f_info },
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{},
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};
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MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids);
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static struct i2c_driver xrs700x_i2c_driver = {
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.driver = {
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.name = "xrs700x-i2c",
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.of_match_table = of_match_ptr(xrs700x_i2c_dt_ids),
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},
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.probe = xrs700x_i2c_probe,
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.remove = xrs700x_i2c_remove,
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.shutdown = xrs700x_i2c_shutdown,
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.id_table = xrs700x_i2c_id,
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};
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module_i2c_driver(xrs700x_i2c_driver);
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MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
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MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver");
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MODULE_LICENSE("GPL v2");
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