Add driver for Intel La Jolla Cove Adapter (LJCA) device.
This is a USB-GPIO, USB-I2C and USB-SPI device. We add 4
drivers to support this device: a USB driver, a GPIO chip
driver, a I2C controller driver and a SPI controller driver.
---
v6:
- ljca: split LJCA USB driver into two commits: USB part and API part.
- gpio/i2c/spi: use auxiliary bus for sub-module device enumeration instead of MFD.
- move document patch for LJCA sysfs entry to the 3th patch of this patch series.
- ljca: fix potential race condition when wait response timeout.
- ljca: use devm_kzalloc to malloc ljca device struct.
v5:
- move ljca.h from drivers/include/mfd to drivers/include/usb.
- ljca: fix a potential memory leak issue.
- add a blank line before return to adust to kernel code style.
- ljca: sysfs: split "cmd" to "ljca_dfu" and "ljca_trace_level".
v4:
- move ljca.c from drivers/mfd to drivers/usb/misc folder.
- fix index warning in sysfs-bus-devices-ljca.
v3:
- spi: make ljca_spi_transfer inline and fix an endian issue.
v2:
- ljca: remove reset command.
- gpio/spi/i2c: add `default MFD_LJCA` in Kconfig.
- gpio: add "select GPIOLIB_IRQCHIP" in Kconfig.
Ye Xiang (6):
usb: Add support for Intel LJCA device
usb: ljca: Add transport interfaces for sub-module drivers
Documentation: Add ABI doc for attributes of LJCA device
gpio: Add support for Intel LJCA USB GPIO driver
i2c: Add support for Intel LJCA USB I2C driver
spi: Add support for Intel LJCA USB SPI driver
.../ABI/testing/sysfs-bus-usb-devices-ljca | 36 +
drivers/gpio/Kconfig | 12 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-ljca.c | 458 ++++++++
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-ljca.c | 355 ++++++
drivers/spi/Kconfig | 11 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-ljca.c | 289 +++++
drivers/usb/misc/Kconfig | 13 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/ljca.c | 1012 +++++++++++++++++
include/linux/usb/ljca.h | 95 ++
14 files changed, 2296 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
create mode 100644 drivers/gpio/gpio-ljca.c
create mode 100644 drivers/i2c/busses/i2c-ljca.c
create mode 100644 drivers/spi/spi-ljca.c
create mode 100644 drivers/usb/misc/ljca.c
create mode 100644 include/linux/usb/ljca.h
--
2.34.1
This patch implements the I2C function of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
I2c module with specific protocol through interfaces exported by LJCA USB
driver.
Signed-off-by: Ye Xiang <[email protected]>
---
drivers/i2c/busses/Kconfig | 11 ++
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-ljca.c | 355 ++++++++++++++++++++++++++++++++++
3 files changed, 367 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-ljca.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 25eb4e8fd22f..37fed62797a9 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1261,6 +1261,17 @@ config I2C_DLN2
This driver can also be built as a module. If so, the module
will be called i2c-dln2.
+config I2C_LJCA
+ tristate "I2C functionality of Intel La Jolla Cove Adapter"
+ depends on USB_LJCA
+ default USB_LJCA
+ help
+ If you say yes to this option, I2C functionality support of Intel
+ La Jolla Cove Adapter (LJCA) will be included.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-ljca.
+
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 af56fe2c75c0..4af5b06ef288 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -133,6 +133,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o
# External I2C/SMBus adapter drivers
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
+obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o
obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o
diff --git a/drivers/i2c/busses/i2c-ljca.c b/drivers/i2c/busses/i2c-ljca.c
new file mode 100644
index 000000000000..de80aa88adb9
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ljca.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB-I2C driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/usb/ljca.h>
+
+/* I2C commands */
+enum ljca_i2c_cmd {
+ LJCA_I2C_INIT = 1,
+ LJCA_I2C_XFER,
+ LJCA_I2C_START,
+ LJCA_I2C_STOP,
+ LJCA_I2C_READ,
+ LJCA_I2C_WRITE,
+};
+
+enum ljca_xfer_type {
+ LJCA_I2C_READ_XFER_TYPE,
+ LJCA_I2C_WRITE_XFER_TYPE,
+};
+
+/* I2C r/w Flags */
+#define LJCA_I2C_SLAVE_TRANSFER_WRITE (0)
+#define LJCA_I2C_SLAVE_TRANSFER_READ (1)
+
+/* I2C init flags */
+#define LJCA_I2C_INIT_FLAG_MODE BIT(0)
+#define LJCA_I2C_INIT_FLAG_MODE_POLLING FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 0)
+#define LJCA_I2C_INIT_FLAG_MODE_INTERRUPT FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 1)
+
+#define LJCA_I2C_INIT_FLAG_ADDR_16BIT BIT(0)
+
+#define LJCA_I2C_INIT_FLAG_FREQ GENMASK(2, 1)
+#define LJCA_I2C_INIT_FLAG_FREQ_100K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 0)
+#define LJCA_I2C_INIT_FLAG_FREQ_400K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 1)
+#define LJCA_I2C_INIT_FLAG_FREQ_1M FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 2)
+
+/* I2C Transfer */
+struct i2c_xfer {
+ u8 id;
+ u8 slave;
+ u16 flag; /* speed, 8/16bit addr, addr increase, etc */
+ u16 addr;
+ u16 len;
+ u8 data[];
+} __packed;
+
+/* I2C raw commands: Init/Start/Read/Write/Stop */
+struct i2c_rw_packet {
+ u8 id;
+ __le16 len;
+ u8 data[];
+} __packed;
+
+#define LJCA_I2C_BUF_SIZE 60
+#define LJCA_I2C_MAX_XFER_SIZE (LJCA_I2C_BUF_SIZE - sizeof(struct i2c_rw_packet))
+
+struct ljca_i2c_dev {
+ struct auxiliary_device *auxdev;
+ struct ljca_i2c_info *i2c_info;
+ struct i2c_adapter adap;
+
+ u8 obuf[LJCA_I2C_BUF_SIZE];
+ u8 ibuf[LJCA_I2C_BUF_SIZE];
+};
+
+static u8 ljca_i2c_format_slave_addr(u8 slave_addr, u8 type)
+{
+ return (slave_addr << 1) | (type == LJCA_I2C_READ_XFER_TYPE) ?
+ LJCA_I2C_SLAVE_TRANSFER_READ :
+ LJCA_I2C_SLAVE_TRANSFER_WRITE;
+}
+
+static int ljca_i2c_init(struct ljca_i2c_dev *ljca_i2c, u8 id)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = id;
+ w_packet->data[0] = LJCA_I2C_INIT_FLAG_FREQ_400K;
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ return ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_INIT, w_packet,
+ struct_size(w_packet, data, 1), NULL, NULL);
+}
+
+static int ljca_i2c_start(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, enum ljca_xfer_type type)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->data[0] = ljca_i2c_format_slave_addr(slave_addr, type);
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_START, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len < 0 || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c start failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_stop(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->data[0] = 0;
+ w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_STOP, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len < 0 || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c stop failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_pure_read(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ int ret;
+ s16 rp_len;
+
+ if (len > LJCA_I2C_MAX_XFER_SIZE)
+ return -EINVAL;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->len = cpu_to_le16(len);
+ w_packet->data[0] = 0;
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_READ, w_packet,
+ struct_size(w_packet, data, 1), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rp_len = le16_to_cpu(r_packet->len);
+ if (rp_len != len || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c raw read failed len:%d id:%d %d\n", rp_len,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ memcpy(data, r_packet->data, len);
+
+ return 0;
+}
+
+static int ljca_i2c_read(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data,
+ u8 len)
+{
+ int ret;
+
+ ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_READ_XFER_TYPE);
+ if (ret)
+ goto out_stop;
+
+ ret = ljca_i2c_pure_read(ljca_i2c, data, len);
+
+out_stop:
+ ljca_i2c_stop(ljca_i2c, slave_addr);
+
+ return ret;
+}
+
+static int ljca_i2c_pure_write(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
+{
+ struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf;
+ struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf;
+ unsigned int ibuf_len = LJCA_I2C_BUF_SIZE;
+ s16 rplen;
+ int ret;
+
+ if (len > LJCA_I2C_MAX_XFER_SIZE)
+ return -EINVAL;
+
+ memset(w_packet, 0, sizeof(*w_packet));
+ w_packet->id = ljca_i2c->i2c_info->id;
+ w_packet->len = cpu_to_le16(len);
+ memcpy(w_packet->data, data, len);
+
+ ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_WRITE, w_packet,
+ struct_size(w_packet, data, len), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet))
+ return -EIO;
+
+ rplen = le16_to_cpu(r_packet->len);
+ if (rplen != len || r_packet->id != w_packet->id) {
+ dev_err(&ljca_i2c->adap.dev, "i2c write failed len:%d id:%d/%d\n", rplen,
+ r_packet->id, w_packet->id);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ljca_i2c_write(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data, u8 len)
+{
+ int ret;
+
+ if (!data)
+ return -EINVAL;
+
+ ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_WRITE_XFER_TYPE);
+ if (ret)
+ goto out_stop;
+
+ ret = ljca_i2c_pure_write(ljca_i2c, data, len);
+
+out_stop:
+ ljca_i2c_stop(ljca_i2c, slave_addr);
+
+ return ret;
+}
+
+static int ljca_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msg, int num)
+{
+ struct ljca_i2c_dev *ljca_i2c;
+ struct i2c_msg *cur_msg;
+ int i, ret;
+
+ ljca_i2c = i2c_get_adapdata(adapter);
+ if (!ljca_i2c)
+ return -EINVAL;
+
+ for (i = 0; i < num; i++) {
+ cur_msg = &msg[i];
+ if (cur_msg->flags & I2C_M_RD)
+ ret = ljca_i2c_read(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len);
+ else
+ ret = ljca_i2c_write(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len);
+
+ if (ret)
+ return ret;
+ }
+
+ return num;
+}
+
+static u32 ljca_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_adapter_quirks ljca_i2c_quirks = {
+ .max_read_len = LJCA_I2C_MAX_XFER_SIZE,
+ .max_write_len = LJCA_I2C_MAX_XFER_SIZE,
+};
+
+static const struct i2c_algorithm ljca_i2c_algo = {
+ .master_xfer = ljca_i2c_xfer,
+ .functionality = ljca_i2c_func,
+};
+
+static int ljca_i2c_probe(struct auxiliary_device *auxdev,
+ const struct auxiliary_device_id *aux_dev_id)
+{
+ struct ljca_i2c_dev *ljca_i2c;
+ int ret;
+
+ ljca_i2c = devm_kzalloc(&auxdev->dev, sizeof(*ljca_i2c), GFP_KERNEL);
+ if (!ljca_i2c)
+ return -ENOMEM;
+
+ ljca_i2c->auxdev = auxdev;
+ ljca_i2c->i2c_info = dev_get_platdata(&auxdev->dev);
+ ljca_i2c->adap.owner = THIS_MODULE;
+ ljca_i2c->adap.class = I2C_CLASS_HWMON;
+ ljca_i2c->adap.algo = &ljca_i2c_algo;
+ ljca_i2c->adap.quirks = &ljca_i2c_quirks;
+ ljca_i2c->adap.dev.parent = &auxdev->dev;
+ device_set_node(&ljca_i2c->adap.dev, dev_fwnode(&auxdev->dev));
+ i2c_set_adapdata(&ljca_i2c->adap, ljca_i2c);
+ snprintf(ljca_i2c->adap.name, sizeof(ljca_i2c->adap.name), "%s-%s-%d",
+ dev_name(&auxdev->dev), dev_name(auxdev->dev.parent),
+ ljca_i2c->i2c_info->id);
+
+ auxiliary_set_drvdata(auxdev, ljca_i2c);
+
+ ret = ljca_i2c_init(ljca_i2c, ljca_i2c->i2c_info->id);
+ if (ret) {
+ dev_err(&auxdev->dev, "i2c init failed id:%d\n", ljca_i2c->i2c_info->id);
+ return -EIO;
+ }
+
+ return devm_i2c_add_adapter(&auxdev->dev, &ljca_i2c->adap);
+}
+
+#define LJCA_I2C_DRV_NAME "ljca.ljca-i2c"
+static const struct auxiliary_device_id ljca_i2c_id_table[] = {
+ { LJCA_I2C_DRV_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, ljca_i2c_id_table);
+
+static struct auxiliary_driver ljca_i2c_driver = {
+ .probe = ljca_i2c_probe,
+ .id_table = ljca_i2c_id_table,
+};
+module_auxiliary_driver(ljca_i2c_driver);
+
+MODULE_AUTHOR("Ye Xiang <[email protected]>");
+MODULE_AUTHOR("Wang Zhifeng <[email protected]>");
+MODULE_AUTHOR("Zhang Lixu <[email protected]>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-I2C driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LJCA);
--
2.34.1
This patch implements the SPI function of Intel USB-I2C/GPIO/SPI adapter
device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
SPI module with specific protocol through interfaces exported by LJCA USB
driver.
Signed-off-by: Ye Xiang <[email protected]>
---
drivers/spi/Kconfig | 11 ++
drivers/spi/Makefile | 1 +
drivers/spi/spi-ljca.c | 289 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 301 insertions(+)
create mode 100644 drivers/spi/spi-ljca.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 47bbba04fe3a..c3de4e20531f 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -404,6 +404,17 @@ config SPI_HISI_SFC_V3XX
This enables support for HiSilicon v3xx SPI NOR flash controller
found in hi16xx chipsets.
+config SPI_LJCA
+ tristate "Intel La Jolla Cove Adapter SPI support"
+ depends on USB_LJCA
+ default USB_LJCA
+ help
+ Select this option to enable SPI driver for the Intel
+ La Jolla Cove Adapter (LJCA) board.
+
+ This driver can also be built as a module. If so, the module
+ will be called spi-ljca.
+
config SPI_NXP_FLEXSPI
tristate "NXP Flex SPI controller"
depends on ARCH_LAYERSCAPE || HAS_IOMEM
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index d87cf75bee6a..0d0cc1b0fb9b 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_SPI_INTEL_PCI) += spi-intel-pci.o
obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o
obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
+obj-$(CONFIG_SPI_LJCA) += spi-ljca.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o
diff --git a/drivers/spi/spi-ljca.c b/drivers/spi/spi-ljca.c
new file mode 100644
index 000000000000..1d925e8c7156
--- /dev/null
+++ b/drivers/spi/spi-ljca.c
@@ -0,0 +1,289 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel La Jolla Cove Adapter USB-SPI driver
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/usb/ljca.h>
+
+/* SPI commands */
+enum ljca_spi_cmd {
+ LJCA_SPI_INIT = 1,
+ LJCA_SPI_READ,
+ LJCA_SPI_WRITE,
+ LJCA_SPI_WRITEREAD,
+ LJCA_SPI_DEINIT,
+};
+
+#define LJCA_SPI_BUS_MAX_HZ 48000000
+enum {
+ LJCA_SPI_BUS_SPEED_24M,
+ LJCA_SPI_BUS_SPEED_12M,
+ LJCA_SPI_BUS_SPEED_8M,
+ LJCA_SPI_BUS_SPEED_6M,
+ LJCA_SPI_BUS_SPEED_4_8M, /*4.8MHz*/
+ LJCA_SPI_BUS_SPEED_MIN = LJCA_SPI_BUS_SPEED_4_8M,
+};
+
+enum {
+ LJCA_SPI_CLOCK_LOW_POLARITY,
+ LJCA_SPI_CLOCK_HIGH_POLARITY,
+};
+
+enum {
+ LJCA_SPI_CLOCK_FIRST_PHASE,
+ LJCA_SPI_CLOCK_SECOND_PHASE,
+};
+
+#define LJCA_SPI_BUF_SIZE 60
+#define LJCA_SPI_MAX_XFER_SIZE (LJCA_SPI_BUF_SIZE - sizeof(struct spi_xfer_packet))
+
+#define LJCA_SPI_CLK_MODE_POLARITY BIT(0)
+#define LJCA_SPI_CLK_MODE_PHASE BIT(1)
+
+struct spi_init_packet {
+ u8 index;
+ u8 speed;
+ u8 mode;
+} __packed;
+
+#define LJCA_SPI_XFER_INDICATOR_ID GENMASK(5, 0)
+#define LJCA_SPI_XFER_INDICATOR_CMPL BIT(6)
+#define LJCA_SPI_XFER_INDICATOR_INDEX BIT(7)
+
+struct spi_xfer_packet {
+ u8 indicator;
+ s8 len;
+ u8 data[];
+} __packed;
+
+struct ljca_spi_dev {
+ struct auxiliary_device *auxdev;
+ struct spi_controller *controller;
+ struct ljca_spi_info *spi_info;
+ u8 speed;
+ u8 mode;
+
+ u8 obuf[LJCA_SPI_BUF_SIZE];
+ u8 ibuf[LJCA_SPI_BUF_SIZE];
+};
+
+static int ljca_spi_read_write(struct ljca_spi_dev *ljca_spi, const u8 *w_data, u8 *r_data, int len,
+ int id, int complete, int cmd)
+{
+ struct spi_xfer_packet *w_packet = (struct spi_xfer_packet *)ljca_spi->obuf;
+ struct spi_xfer_packet *r_packet = (struct spi_xfer_packet *)ljca_spi->ibuf;
+ unsigned int ibuf_len = LJCA_SPI_BUF_SIZE;
+ int ret;
+
+ w_packet->indicator = FIELD_PREP(LJCA_SPI_XFER_INDICATOR_ID, id) |
+ FIELD_PREP(LJCA_SPI_XFER_INDICATOR_CMPL, complete) |
+ FIELD_PREP(LJCA_SPI_XFER_INDICATOR_INDEX,
+ ljca_spi->spi_info->id);
+
+ if (cmd == LJCA_SPI_READ) {
+ w_packet->len = sizeof(u16);
+ *(__le16 *)&w_packet->data[0] = cpu_to_le16(len);
+ } else {
+ w_packet->len = len;
+ memcpy(w_packet->data, w_data, len);
+ }
+
+ ret = ljca_transfer(ljca_spi->spi_info->ljca, cmd, w_packet,
+ struct_size(w_packet, data, w_packet->len), r_packet, &ibuf_len);
+ if (ret)
+ return ret;
+
+ if (ibuf_len < sizeof(*r_packet) || r_packet->len <= 0)
+ return -EIO;
+
+ if (r_data)
+ memcpy(r_data, r_packet->data, r_packet->len);
+
+ return 0;
+}
+
+static int ljca_spi_init(struct ljca_spi_dev *ljca_spi, u8 div, u8 mode)
+{
+ struct spi_init_packet w_packet = {};
+ int ret;
+
+ if (ljca_spi->mode == mode && ljca_spi->speed == div)
+ return 0;
+
+ w_packet.mode = FIELD_PREP(LJCA_SPI_CLK_MODE_POLARITY,
+ (mode & SPI_CPOL) ? LJCA_SPI_CLOCK_HIGH_POLARITY :
+ LJCA_SPI_CLOCK_LOW_POLARITY) |
+ FIELD_PREP(LJCA_SPI_CLK_MODE_PHASE,
+ (mode & SPI_CPHA) ? LJCA_SPI_CLOCK_SECOND_PHASE :
+ LJCA_SPI_CLOCK_FIRST_PHASE);
+
+ w_packet.index = ljca_spi->spi_info->id;
+ w_packet.speed = div;
+ ret = ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_INIT, &w_packet,
+ sizeof(w_packet), NULL, NULL);
+ if (ret)
+ return ret;
+
+ ljca_spi->mode = mode;
+ ljca_spi->speed = div;
+
+ return 0;
+}
+
+static int ljca_spi_deinit(struct ljca_spi_dev *ljca_spi)
+{
+ struct spi_init_packet w_packet = {};
+
+ w_packet.index = ljca_spi->spi_info->id;
+ return ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_DEINIT, &w_packet, sizeof(w_packet),
+ NULL, NULL);
+}
+
+static inline int ljca_spi_transfer(struct ljca_spi_dev *ljca_spi, const u8 *tx_data, u8 *rx_data,
+ u16 len)
+{
+ int remaining = len;
+ int offset = 0;
+ int cur_len;
+ int complete;
+ int i;
+ int cmd;
+ int ret;
+
+ if (tx_data && rx_data)
+ cmd = LJCA_SPI_WRITEREAD;
+ else if (tx_data)
+ cmd = LJCA_SPI_WRITE;
+ else if (rx_data)
+ cmd = LJCA_SPI_READ;
+ else
+ return -EINVAL;
+
+ for (i = 0; remaining > 0; i++) {
+ cur_len = min_t(unsigned int, remaining, LJCA_SPI_MAX_XFER_SIZE);
+ complete = (cur_len == remaining);
+
+ ret = ljca_spi_read_write(ljca_spi,
+ tx_data ? tx_data + offset : NULL,
+ rx_data ? rx_data + offset : NULL,
+ cur_len, i, complete, cmd);
+ if (ret)
+ return ret;
+
+ offset += cur_len;
+ remaining -= cur_len;
+ }
+
+ return 0;
+}
+
+static int ljca_spi_transfer_one(struct spi_controller *controller, struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller);
+ int ret;
+ u8 div;
+
+ div = min_t(u8, LJCA_SPI_BUS_SPEED_MIN,
+ DIV_ROUND_UP(controller->max_speed_hz, xfer->speed_hz) / 2 - 1);
+ ret = ljca_spi_init(ljca_spi, div, spi->mode);
+ if (ret) {
+ dev_err(&ljca_spi->auxdev->dev, "cannot initialize transfer ret %d\n", ret);
+ return ret;
+ }
+
+ ret = ljca_spi_transfer(ljca_spi, xfer->tx_buf, xfer->rx_buf, xfer->len);
+ if (ret)
+ dev_err(&ljca_spi->auxdev->dev, "ljca spi transfer failed!\n");
+
+ return ret;
+}
+
+static int ljca_spi_probe(struct auxiliary_device *auxdev,
+ const struct auxiliary_device_id *aux_dev_id)
+{
+ struct spi_controller *controller;
+ struct ljca_spi_dev *ljca_spi;
+ int ret;
+
+ controller = devm_spi_alloc_master(&auxdev->dev, sizeof(*ljca_spi));
+ if (!controller)
+ return -ENOMEM;
+
+ auxiliary_set_drvdata(auxdev, controller);
+ ljca_spi = spi_controller_get_devdata(controller);
+
+ ljca_spi->spi_info = dev_get_platdata(&auxdev->dev);
+ ljca_spi->controller = controller;
+ ljca_spi->auxdev = auxdev;
+ device_set_node(&ljca_spi->controller->dev, dev_fwnode(&auxdev->dev));
+
+ controller->bus_num = -1;
+ controller->mode_bits = SPI_CPHA | SPI_CPOL;
+ controller->transfer_one = ljca_spi_transfer_one;
+ controller->auto_runtime_pm = false;
+ controller->max_speed_hz = LJCA_SPI_BUS_MAX_HZ;
+
+ ret = spi_register_controller(controller);
+ if (ret)
+ dev_err(&auxdev->dev, "Failed to register controller\n");
+
+ return ret;
+}
+
+static void ljca_spi_dev_remove(struct auxiliary_device *auxdev)
+{
+ struct spi_controller *controller = auxiliary_get_drvdata(auxdev);
+ struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller);
+
+ spi_unregister_controller(controller);
+ ljca_spi_deinit(ljca_spi);
+}
+
+static int ljca_spi_dev_suspend(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+
+ return spi_controller_suspend(controller);
+}
+
+static int ljca_spi_dev_resume(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+
+ return spi_controller_resume(controller);
+}
+
+static const struct dev_pm_ops ljca_spi_pm = {
+ SYSTEM_SLEEP_PM_OPS(ljca_spi_dev_suspend, ljca_spi_dev_resume)
+};
+
+#define LJCA_SPI_DRV_NAME "ljca.ljca-spi"
+static const struct auxiliary_device_id ljca_spi_id_table[] = {
+ { LJCA_SPI_DRV_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, ljca_spi_id_table);
+
+static struct auxiliary_driver ljca_spi_driver = {
+ .driver.pm = &ljca_spi_pm,
+ .probe = ljca_spi_probe,
+ .remove = ljca_spi_dev_remove,
+ .id_table = ljca_spi_id_table,
+};
+module_auxiliary_driver(ljca_spi_driver);
+
+MODULE_AUTHOR("Ye Xiang <[email protected]>");
+MODULE_AUTHOR("Wang Zhifeng <[email protected]>");
+MODULE_AUTHOR("Zhang Lixu <[email protected]>");
+MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-SPI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(LJCA);
--
2.34.1
Hi Ye,
looks good, just a few questions:
On Fri, Mar 24, 2023 at 01:21:12AM +0800, Ye Xiang wrote:
> This patch implements the I2C function of Intel USB-I2C/GPIO/SPI adapter
also here, please keep using the imperative form.
> device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
> I2c module with specific protocol through interfaces exported by LJCA USB
> driver.
>
> Signed-off-by: Ye Xiang <[email protected]>
[...]
> +enum ljca_xfer_type {
> + LJCA_I2C_READ_XFER_TYPE,
> + LJCA_I2C_WRITE_XFER_TYPE,
> +};
> +
> +/* I2C r/w Flags */
> +#define LJCA_I2C_SLAVE_TRANSFER_WRITE (0)
> +#define LJCA_I2C_SLAVE_TRANSFER_READ (1)
the enum above and the bits here look a bit redundant to me as
they are the same thing.
What's the point for writing something like:
if (type == LJCA_I2C_READ_XFER_TYPE)
addr |= LJCA_I2C_SLAVE_TRANSFER_WRITE
when the two are the same. You are just adding confusion.
As this is a bit field, you can just keep the defines.
[...]
> +static u8 ljca_i2c_format_slave_addr(u8 slave_addr, u8 type)
> +{
> + return (slave_addr << 1) | (type == LJCA_I2C_READ_XFER_TYPE) ?
> + LJCA_I2C_SLAVE_TRANSFER_READ :
> + LJCA_I2C_SLAVE_TRANSFER_WRITE;
> +}
How about:
return (slave_addr << 1) | !!type;
BTW, am I reading correctly that the address here is composed as:
7 6 5 5 3 2 1 0
ADDR7 ADDR6 ADDR5 ADDR4 ADDR3 ADDR2 ADDR1 R/W
[...]
> +static u32 ljca_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
how is the smbus supported here?
Andi
Hi Andi,
Thanks for the review.
On Sun, Mar 26, 2023 at 05:38:46PM +0200, Andi Shyti wrote:
> Hi Ye,
>
> looks good, just a few questions:
>
> On Fri, Mar 24, 2023 at 01:21:12AM +0800, Ye Xiang wrote:
> > This patch implements the I2C function of Intel USB-I2C/GPIO/SPI adapter
>
> also here, please keep using the imperative form.
Got it.
>
> > device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA
> > I2c module with specific protocol through interfaces exported by LJCA USB
> > driver.
...
> > +static u8 ljca_i2c_format_slave_addr(u8 slave_addr, u8 type)
> > +{
> > + return (slave_addr << 1) | (type == LJCA_I2C_READ_XFER_TYPE) ?
> > + LJCA_I2C_SLAVE_TRANSFER_READ :
> > + LJCA_I2C_SLAVE_TRANSFER_WRITE;
> > +}
>
> How about:
>
> return (slave_addr << 1) | !!type;
>
> BTW, am I reading correctly that the address here is composed as:
>
> 7 6 5 5 3 2 1 0
> ADDR7 ADDR6 ADDR5 ADDR4 ADDR3 ADDR2 ADDR1 R/W
>
> [...]
>
You are correct. Will adopt this solution on next version.
> > +static u32 ljca_i2c_func(struct i2c_adapter *adap)
> > +{
> > + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>
> how is the smbus supported here?
The i2c-sub module of LJCA device is SMBUS compatible.
It's supported by LJCA device hardware itself.
Thanks
Ye Xiang