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-rw-r--r--drivers/i2c/busses/Kconfig10
-rw-r--r--drivers/i2c/busses/Makefile1
-rw-r--r--drivers/i2c/busses/i2c-i801.c2
-rw-r--r--drivers/i2c/busses/i2c-nct6694.c196
-rw-r--r--drivers/i2c/busses/i2c-riic.c2
-rw-r--r--drivers/i2c/busses/i2c-rtl9300.c21
6 files changed, 216 insertions, 16 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 070d014fdc5d..63a2b5a9abc3 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1357,6 +1357,16 @@ config I2C_LJCA
This driver can also be built as a module. If so, the module
will be called i2c-ljca.
+config I2C_NCT6694
+ tristate "Nuvoton NCT6694 I2C adapter support"
+ depends on MFD_NCT6694
+ help
+ If you say yes to this option, support will be included for Nuvoton
+ NCT6694, a USB to I2C interface.
+
+ This driver can also be built as a module. If so, the module will
+ be called i2c-nct6694.
+
config I2C_CP2615
tristate "Silicon Labs CP2615 USB sound card and I2C adapter"
depends on USB
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 04db855fdfd6..fe8cf6325fc9 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -135,6 +135,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o
+obj-$(CONFIG_I2C_NCT6694) += i2c-nct6694.o
obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index a7f89946dad4..e94ac746a741 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -1052,7 +1052,7 @@ static const struct pci_device_id i801_ids[] = {
{ PCI_DEVICE_DATA(INTEL, METEOR_LAKE_P_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, METEOR_LAKE_SOC_S_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, METEOR_LAKE_PCH_S_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
- { PCI_DEVICE_DATA(INTEL, BIRCH_STREAM_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
+ { PCI_DEVICE_DATA(INTEL, BIRCH_STREAM_SMBUS, FEATURES_ICH5) },
{ PCI_DEVICE_DATA(INTEL, ARROW_LAKE_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, PANTHER_LAKE_H_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
{ PCI_DEVICE_DATA(INTEL, PANTHER_LAKE_P_SMBUS, FEATURES_ICH5 | FEATURE_TCO_CNL) },
diff --git a/drivers/i2c/busses/i2c-nct6694.c b/drivers/i2c/busses/i2c-nct6694.c
new file mode 100644
index 000000000000..1413ab6f9462
--- /dev/null
+++ b/drivers/i2c/busses/i2c-nct6694.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton NCT6694 I2C adapter driver based on USB interface.
+ *
+ * Copyright (C) 2025 Nuvoton Technology Corp.
+ */
+
+#include <linux/i2c.h>
+#include <linux/idr.h>
+#include <linux/kernel.h>
+#include <linux/mfd/nct6694.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/*
+ * USB command module type for NCT6694 I2C controller.
+ * This defines the module type used for communication with the NCT6694
+ * I2C controller over the USB interface.
+ */
+#define NCT6694_I2C_MOD 0x03
+
+/* Command 00h - I2C Deliver */
+#define NCT6694_I2C_DELIVER 0x00
+#define NCT6694_I2C_DELIVER_SEL 0x00
+
+#define NCT6694_I2C_MAX_XFER_SIZE 64
+#define NCT6694_I2C_MAX_DEVS 6
+
+static unsigned char br_reg[NCT6694_I2C_MAX_DEVS] = {[0 ... (NCT6694_I2C_MAX_DEVS - 1)] = 0xFF};
+
+module_param_array(br_reg, byte, NULL, 0644);
+MODULE_PARM_DESC(br_reg,
+ "I2C Baudrate register per adapter: (0=25K, 1=50K, 2=100K, 3=200K, 4=400K, 5=800K, 6=1M), default=2");
+
+enum nct6694_i2c_baudrate {
+ NCT6694_I2C_BR_25K = 0,
+ NCT6694_I2C_BR_50K,
+ NCT6694_I2C_BR_100K,
+ NCT6694_I2C_BR_200K,
+ NCT6694_I2C_BR_400K,
+ NCT6694_I2C_BR_800K,
+ NCT6694_I2C_BR_1M
+};
+
+struct __packed nct6694_i2c_deliver {
+ u8 port;
+ u8 br;
+ u8 addr;
+ u8 w_cnt;
+ u8 r_cnt;
+ u8 rsv[11];
+ u8 write_data[NCT6694_I2C_MAX_XFER_SIZE];
+ u8 read_data[NCT6694_I2C_MAX_XFER_SIZE];
+};
+
+struct nct6694_i2c_data {
+ struct device *dev;
+ struct nct6694 *nct6694;
+ struct i2c_adapter adapter;
+ struct nct6694_i2c_deliver deliver;
+ unsigned char port;
+ unsigned char br;
+};
+
+static int nct6694_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+ struct nct6694_i2c_data *data = adap->algo_data;
+ struct nct6694_i2c_deliver *deliver = &data->deliver;
+ static const struct nct6694_cmd_header cmd_hd = {
+ .mod = NCT6694_I2C_MOD,
+ .cmd = NCT6694_I2C_DELIVER,
+ .sel = NCT6694_I2C_DELIVER_SEL,
+ .len = cpu_to_le16(sizeof(*deliver))
+ };
+ int ret, i;
+
+ for (i = 0; i < num; i++) {
+ struct i2c_msg *msg_temp = &msgs[i];
+
+ memset(deliver, 0, sizeof(*deliver));
+
+ deliver->port = data->port;
+ deliver->br = data->br;
+ deliver->addr = i2c_8bit_addr_from_msg(msg_temp);
+ if (msg_temp->flags & I2C_M_RD) {
+ deliver->r_cnt = msg_temp->len;
+ ret = nct6694_write_msg(data->nct6694, &cmd_hd, deliver);
+ if (ret < 0)
+ return ret;
+
+ memcpy(msg_temp->buf, deliver->read_data, msg_temp->len);
+ } else {
+ deliver->w_cnt = msg_temp->len;
+ memcpy(deliver->write_data, msg_temp->buf, msg_temp->len);
+ ret = nct6694_write_msg(data->nct6694, &cmd_hd, deliver);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ return num;
+}
+
+static u32 nct6694_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_adapter_quirks nct6694_i2c_quirks = {
+ .max_read_len = NCT6694_I2C_MAX_XFER_SIZE,
+ .max_write_len = NCT6694_I2C_MAX_XFER_SIZE,
+};
+
+static const struct i2c_algorithm nct6694_i2c_algo = {
+ .xfer = nct6694_i2c_xfer,
+ .functionality = nct6694_i2c_func,
+};
+
+static int nct6694_i2c_set_baudrate(struct nct6694_i2c_data *data)
+{
+ if (data->port >= NCT6694_I2C_MAX_DEVS) {
+ dev_err(data->dev, "Invalid I2C port index %d\n", data->port);
+ return -EINVAL;
+ }
+
+ if (br_reg[data->port] > NCT6694_I2C_BR_1M) {
+ dev_warn(data->dev, "Invalid baudrate %d for I2C%d, using 100K\n",
+ br_reg[data->port], data->port);
+ br_reg[data->port] = NCT6694_I2C_BR_100K;
+ }
+
+ data->br = br_reg[data->port];
+
+ return 0;
+}
+
+static void nct6694_i2c_ida_free(void *d)
+{
+ struct nct6694_i2c_data *data = d;
+ struct nct6694 *nct6694 = data->nct6694;
+
+ ida_free(&nct6694->i2c_ida, data->port);
+}
+
+static int nct6694_i2c_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct nct6694 *nct6694 = dev_get_drvdata(dev->parent);
+ struct nct6694_i2c_data *data;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->dev = dev;
+ data->nct6694 = nct6694;
+
+ ret = ida_alloc(&nct6694->i2c_ida, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+ data->port = ret;
+
+ ret = devm_add_action_or_reset(dev, nct6694_i2c_ida_free, data);
+ if (ret)
+ return ret;
+
+ ret = nct6694_i2c_set_baudrate(data);
+ if (ret)
+ return ret;
+
+ sprintf(data->adapter.name, "NCT6694 I2C Adapter %d", data->port);
+ data->adapter.owner = THIS_MODULE;
+ data->adapter.algo = &nct6694_i2c_algo;
+ data->adapter.quirks = &nct6694_i2c_quirks;
+ data->adapter.dev.parent = dev;
+ data->adapter.algo_data = data;
+
+ platform_set_drvdata(pdev, data);
+
+ return devm_i2c_add_adapter(dev, &data->adapter);
+}
+
+static struct platform_driver nct6694_i2c_driver = {
+ .driver = {
+ .name = "nct6694-i2c",
+ },
+ .probe = nct6694_i2c_probe,
+};
+
+module_platform_driver(nct6694_i2c_driver);
+
+MODULE_DESCRIPTION("USB-I2C adapter driver for NCT6694");
+MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nct6694-i2c");
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 9c164a4b9bb9..b0ee9ac45a97 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -386,7 +386,7 @@ static int riic_init_hw(struct riic_dev *riic)
*/
total_ticks = DIV_ROUND_UP(rate, t->bus_freq_hz ?: 1);
- for (cks = 0; cks < 7; cks++) {
+ for (cks = 0; cks <= 7; cks++) {
/*
* 60% low time must be less than BRL + 2 + 1
* BRL max register value is 0x1F.
diff --git a/drivers/i2c/busses/i2c-rtl9300.c b/drivers/i2c/busses/i2c-rtl9300.c
index cfafe089102a..af991b28e4f8 100644
--- a/drivers/i2c/busses/i2c-rtl9300.c
+++ b/drivers/i2c/busses/i2c-rtl9300.c
@@ -99,6 +99,9 @@ static int rtl9300_i2c_config_xfer(struct rtl9300_i2c *i2c, struct rtl9300_i2c_c
{
u32 val, mask;
+ if (len < 1 || len > 16)
+ return -EINVAL;
+
val = chan->bus_freq << RTL9300_I2C_MST_CTRL2_SCL_FREQ_OFS;
mask = RTL9300_I2C_MST_CTRL2_SCL_FREQ_MASK;
@@ -222,15 +225,6 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
}
switch (size) {
- case I2C_SMBUS_QUICK:
- ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0);
- if (ret)
- goto out_unlock;
- ret = rtl9300_i2c_reg_addr_set(i2c, 0, 0);
- if (ret)
- goto out_unlock;
- break;
-
case I2C_SMBUS_BYTE:
if (read_write == I2C_SMBUS_WRITE) {
ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0);
@@ -312,9 +306,8 @@ out_unlock:
static u32 rtl9300_i2c_func(struct i2c_adapter *a)
{
- return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
- I2C_FUNC_SMBUS_BLOCK_DATA;
+ return I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA;
}
static const struct i2c_algorithm rtl9300_i2c_algo = {
@@ -323,7 +316,7 @@ static const struct i2c_algorithm rtl9300_i2c_algo = {
};
static struct i2c_adapter_quirks rtl9300_i2c_quirks = {
- .flags = I2C_AQ_NO_CLK_STRETCH,
+ .flags = I2C_AQ_NO_CLK_STRETCH | I2C_AQ_NO_ZERO_LEN,
.max_read_len = 16,
.max_write_len = 16,
};
@@ -353,7 +346,7 @@ static int rtl9300_i2c_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, i2c);
- if (device_get_child_node_count(dev) >= RTL9300_I2C_MUX_NCHAN)
+ if (device_get_child_node_count(dev) > RTL9300_I2C_MUX_NCHAN)
return dev_err_probe(dev, -EINVAL, "Too many channels\n");
device_for_each_child_node(dev, child) {
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-01 22:00:24 +0000