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path: root/drivers/net/dsa/xrs700x/xrs700x_i2c.c
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Diffstat (limited to 'drivers/net/dsa/xrs700x/xrs700x_i2c.c')
-rw-r--r--drivers/net/dsa/xrs700x/xrs700x_i2c.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/net/dsa/xrs700x/xrs700x_i2c.c b/drivers/net/dsa/xrs700x/xrs700x_i2c.c
new file mode 100644
index 000000000..54065cded
--- /dev/null
+++ b/drivers/net/dsa/xrs700x/xrs700x_i2c.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 NovaTech LLC
+ * George McCollister <george.mccollister@gmail.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include "xrs700x.h"
+#include "xrs700x_reg.h"
+
+struct xrs700x_i2c_cmd {
+ __be32 reg;
+ __be16 val;
+} __packed;
+
+static int xrs700x_i2c_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ struct xrs700x_i2c_cmd cmd;
+ int ret;
+
+ cmd.reg = cpu_to_be32(reg | 1);
+
+ ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg));
+ if (ret < 0) {
+ dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
+ return ret;
+ }
+
+ ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val));
+ if (ret < 0) {
+ dev_err(dev, "xrs i2c_master_recv returned %d\n", ret);
+ return ret;
+ }
+
+ *val = be16_to_cpu(cmd.val);
+ return 0;
+}
+
+static int xrs700x_i2c_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ struct xrs700x_i2c_cmd cmd;
+ int ret;
+
+ cmd.reg = cpu_to_be32(reg);
+ cmd.val = cpu_to_be16(val);
+
+ ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd));
+ if (ret < 0) {
+ dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct regmap_config xrs700x_i2c_regmap_config = {
+ .val_bits = 16,
+ .reg_stride = 2,
+ .reg_bits = 32,
+ .pad_bits = 0,
+ .write_flag_mask = 0,
+ .read_flag_mask = 0,
+ .reg_read = xrs700x_i2c_reg_read,
+ .reg_write = xrs700x_i2c_reg_write,
+ .max_register = 0,
+ .cache_type = REGCACHE_NONE,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .val_format_endian = REGMAP_ENDIAN_BIG
+};
+
+static int xrs700x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *i2c_id)
+{
+ struct xrs700x *priv;
+ int ret;
+
+ priv = xrs700x_switch_alloc(&i2c->dev, i2c);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
+ &xrs700x_i2c_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret);
+ return ret;
+ }
+
+ i2c_set_clientdata(i2c, priv);
+
+ ret = xrs700x_switch_register(priv);
+
+ /* Main DSA driver may not be started yet. */
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void xrs700x_i2c_remove(struct i2c_client *i2c)
+{
+ struct xrs700x *priv = i2c_get_clientdata(i2c);
+
+ if (!priv)
+ return;
+
+ xrs700x_switch_remove(priv);
+}
+
+static void xrs700x_i2c_shutdown(struct i2c_client *i2c)
+{
+ struct xrs700x *priv = i2c_get_clientdata(i2c);
+
+ if (!priv)
+ return;
+
+ xrs700x_switch_shutdown(priv);
+
+ i2c_set_clientdata(i2c, NULL);
+}
+
+static const struct i2c_device_id xrs700x_i2c_id[] = {
+ { "xrs700x-switch", 0 },
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id);
+
+static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = {
+ { .compatible = "arrow,xrs7003e", .data = &xrs7003e_info },
+ { .compatible = "arrow,xrs7003f", .data = &xrs7003f_info },
+ { .compatible = "arrow,xrs7004e", .data = &xrs7004e_info },
+ { .compatible = "arrow,xrs7004f", .data = &xrs7004f_info },
+ {},
+};
+MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids);
+
+static struct i2c_driver xrs700x_i2c_driver = {
+ .driver = {
+ .name = "xrs700x-i2c",
+ .of_match_table = of_match_ptr(xrs700x_i2c_dt_ids),
+ },
+ .probe = xrs700x_i2c_probe,
+ .remove = xrs700x_i2c_remove,
+ .shutdown = xrs700x_i2c_shutdown,
+ .id_table = xrs700x_i2c_id,
+};
+
+module_i2c_driver(xrs700x_i2c_driver);
+
+MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
+MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver");
+MODULE_LICENSE("GPL v2");