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i2c: Add support for Intel LJCA USB I2C driver
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: Wentong Wu <wentong.wu@intel.com> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Wolfram Sang <wsa@kernel.org> Link: https://lore.kernel.org/r/1696833205-16716-3-git-send-email-wentong.wu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wentong Wu
Greg Kroah-Hartman
parent
acd6199f19
commit
bfd3824c88
@ -1264,6 +1264,17 @@ config I2C_DLN2
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This driver can also be built as a module. If so, the module
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will be called i2c-dln2.
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config I2C_LJCA
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tristate "I2C functionality of Intel La Jolla Cove Adapter"
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depends on USB_LJCA
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default USB_LJCA
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help
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If you say yes to this option, I2C functionality support of Intel
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La Jolla Cove Adapter (LJCA) will be included.
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This driver can also be built as a module. If so, the module
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will be called i2c-ljca.
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config I2C_CP2615
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tristate "Silicon Labs CP2615 USB sound card and I2C adapter"
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depends on USB
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@ -133,6 +133,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o
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# External I2C/SMBus adapter drivers
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obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
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obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
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obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o
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obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o
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obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
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obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o
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343
drivers/i2c/busses/i2c-ljca.c
Normal file
343
drivers/i2c/busses/i2c-ljca.c
Normal file
@ -0,0 +1,343 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel La Jolla Cove Adapter USB-I2C driver
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*
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* Copyright (c) 2023, Intel Corporation.
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*/
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#include <linux/acpi.h>
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#include <linux/auxiliary_bus.h>
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/dev_printk.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/usb/ljca.h>
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/* I2C init flags */
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#define LJCA_I2C_INIT_FLAG_MODE BIT(0)
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#define LJCA_I2C_INIT_FLAG_MODE_POLLING FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 0)
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#define LJCA_I2C_INIT_FLAG_MODE_INTERRUPT FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 1)
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#define LJCA_I2C_INIT_FLAG_ADDR_16BIT BIT(0)
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#define LJCA_I2C_INIT_FLAG_FREQ GENMASK(2, 1)
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#define LJCA_I2C_INIT_FLAG_FREQ_100K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 0)
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#define LJCA_I2C_INIT_FLAG_FREQ_400K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 1)
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#define LJCA_I2C_INIT_FLAG_FREQ_1M FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 2)
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#define LJCA_I2C_BUF_SIZE 60u
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#define LJCA_I2C_MAX_XFER_SIZE (LJCA_I2C_BUF_SIZE - sizeof(struct ljca_i2c_rw_packet))
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/* I2C commands */
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enum ljca_i2c_cmd {
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LJCA_I2C_INIT = 1,
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LJCA_I2C_XFER,
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LJCA_I2C_START,
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LJCA_I2C_STOP,
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LJCA_I2C_READ,
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LJCA_I2C_WRITE,
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};
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enum ljca_xfer_type {
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LJCA_I2C_WRITE_XFER_TYPE,
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LJCA_I2C_READ_XFER_TYPE,
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};
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/* I2C raw commands: Init/Start/Read/Write/Stop */
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struct ljca_i2c_rw_packet {
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u8 id;
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__le16 len;
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u8 data[] __counted_by(len);
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} __packed;
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struct ljca_i2c_dev {
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struct ljca_client *ljca;
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struct ljca_i2c_info *i2c_info;
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struct i2c_adapter adap;
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u8 obuf[LJCA_I2C_BUF_SIZE];
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u8 ibuf[LJCA_I2C_BUF_SIZE];
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};
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static int ljca_i2c_init(struct ljca_i2c_dev *ljca_i2c, u8 id)
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{
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struct ljca_i2c_rw_packet *w_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->obuf;
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int ret;
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w_packet->id = id;
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w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
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w_packet->data[0] = LJCA_I2C_INIT_FLAG_FREQ_400K;
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ret = ljca_transfer(ljca_i2c->ljca, LJCA_I2C_INIT, (u8 *)w_packet,
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struct_size(w_packet, data, 1), NULL, 0);
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return ret < 0 ? ret : 0;
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}
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static int ljca_i2c_start(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr,
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enum ljca_xfer_type type)
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{
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struct ljca_i2c_rw_packet *w_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->obuf;
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struct ljca_i2c_rw_packet *r_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->ibuf;
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s16 rp_len;
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int ret;
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w_packet->id = ljca_i2c->i2c_info->id;
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w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
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w_packet->data[0] = (slave_addr << 1) | type;
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ret = ljca_transfer(ljca_i2c->ljca, LJCA_I2C_START, (u8 *)w_packet,
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struct_size(w_packet, data, 1), (u8 *)r_packet,
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LJCA_I2C_BUF_SIZE);
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if (ret < 0 || ret < sizeof(*r_packet))
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return ret < 0 ? ret : -EIO;
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rp_len = le16_to_cpu(r_packet->len);
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if (rp_len < 0 || r_packet->id != w_packet->id) {
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dev_dbg(&ljca_i2c->adap.dev,
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"i2c start failed len: %d id: %d %d\n",
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rp_len, r_packet->id, w_packet->id);
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return -EIO;
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}
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return 0;
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}
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static void ljca_i2c_stop(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr)
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{
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struct ljca_i2c_rw_packet *w_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->obuf;
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struct ljca_i2c_rw_packet *r_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->ibuf;
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s16 rp_len;
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int ret;
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w_packet->id = ljca_i2c->i2c_info->id;
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w_packet->len = cpu_to_le16(sizeof(*w_packet->data));
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w_packet->data[0] = 0;
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ret = ljca_transfer(ljca_i2c->ljca, LJCA_I2C_STOP, (u8 *)w_packet,
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struct_size(w_packet, data, 1), (u8 *)r_packet,
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LJCA_I2C_BUF_SIZE);
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if (ret < 0 || ret < sizeof(*r_packet)) {
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dev_dbg(&ljca_i2c->adap.dev,
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"i2c stop failed ret: %d id: %d\n",
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ret, w_packet->id);
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return;
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}
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rp_len = le16_to_cpu(r_packet->len);
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if (rp_len < 0 || r_packet->id != w_packet->id)
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dev_dbg(&ljca_i2c->adap.dev,
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"i2c stop failed len: %d id: %d %d\n",
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rp_len, r_packet->id, w_packet->id);
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}
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static int ljca_i2c_pure_read(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
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{
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struct ljca_i2c_rw_packet *w_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->obuf;
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struct ljca_i2c_rw_packet *r_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->ibuf;
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s16 rp_len;
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int ret;
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w_packet->id = ljca_i2c->i2c_info->id;
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w_packet->len = cpu_to_le16(len);
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w_packet->data[0] = 0;
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ret = ljca_transfer(ljca_i2c->ljca, LJCA_I2C_READ, (u8 *)w_packet,
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struct_size(w_packet, data, 1), (u8 *)r_packet,
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LJCA_I2C_BUF_SIZE);
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if (ret < 0 || ret < sizeof(*r_packet))
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return ret < 0 ? ret : -EIO;
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rp_len = le16_to_cpu(r_packet->len);
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if (rp_len != len || r_packet->id != w_packet->id) {
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dev_dbg(&ljca_i2c->adap.dev,
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"i2c raw read failed len: %d id: %d %d\n",
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rp_len, r_packet->id, w_packet->id);
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return -EIO;
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}
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memcpy(data, r_packet->data, len);
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return 0;
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}
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static int ljca_i2c_read(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data,
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u8 len)
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{
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int ret;
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ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_READ_XFER_TYPE);
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if (!ret)
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ret = ljca_i2c_pure_read(ljca_i2c, data, len);
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ljca_i2c_stop(ljca_i2c, slave_addr);
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return ret;
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}
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static int ljca_i2c_pure_write(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len)
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{
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struct ljca_i2c_rw_packet *w_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->obuf;
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struct ljca_i2c_rw_packet *r_packet =
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(struct ljca_i2c_rw_packet *)ljca_i2c->ibuf;
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s16 rplen;
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int ret;
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w_packet->id = ljca_i2c->i2c_info->id;
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w_packet->len = cpu_to_le16(len);
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memcpy(w_packet->data, data, len);
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ret = ljca_transfer(ljca_i2c->ljca, LJCA_I2C_WRITE, (u8 *)w_packet,
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struct_size(w_packet, data, len), (u8 *)r_packet,
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LJCA_I2C_BUF_SIZE);
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if (ret < 0 || ret < sizeof(*r_packet))
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return ret < 0 ? ret : -EIO;
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rplen = le16_to_cpu(r_packet->len);
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if (rplen != len || r_packet->id != w_packet->id) {
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dev_dbg(&ljca_i2c->adap.dev,
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"i2c write failed len: %d id: %d/%d\n",
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rplen, r_packet->id, w_packet->id);
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return -EIO;
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}
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return 0;
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}
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static int ljca_i2c_write(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr,
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u8 *data, u8 len)
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{
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int ret;
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ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_WRITE_XFER_TYPE);
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if (!ret)
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ret = ljca_i2c_pure_write(ljca_i2c, data, len);
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ljca_i2c_stop(ljca_i2c, slave_addr);
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return ret;
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}
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static int ljca_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msg,
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int num)
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{
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struct ljca_i2c_dev *ljca_i2c;
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struct i2c_msg *cur_msg;
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int i, ret;
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ljca_i2c = i2c_get_adapdata(adapter);
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if (!ljca_i2c)
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return -EINVAL;
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for (i = 0; i < num; i++) {
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cur_msg = &msg[i];
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if (cur_msg->flags & I2C_M_RD)
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ret = ljca_i2c_read(ljca_i2c, cur_msg->addr,
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cur_msg->buf, cur_msg->len);
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else
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ret = ljca_i2c_write(ljca_i2c, cur_msg->addr,
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cur_msg->buf, cur_msg->len);
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if (ret)
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return ret;
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}
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return num;
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}
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static u32 ljca_i2c_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
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}
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static const struct i2c_adapter_quirks ljca_i2c_quirks = {
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.flags = I2C_AQ_NO_ZERO_LEN,
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.max_read_len = LJCA_I2C_MAX_XFER_SIZE,
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.max_write_len = LJCA_I2C_MAX_XFER_SIZE,
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};
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static const struct i2c_algorithm ljca_i2c_algo = {
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.master_xfer = ljca_i2c_xfer,
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.functionality = ljca_i2c_func,
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};
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static int ljca_i2c_probe(struct auxiliary_device *auxdev,
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const struct auxiliary_device_id *aux_dev_id)
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{
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struct ljca_client *ljca = auxiliary_dev_to_ljca_client(auxdev);
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struct ljca_i2c_dev *ljca_i2c;
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int ret;
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ljca_i2c = devm_kzalloc(&auxdev->dev, sizeof(*ljca_i2c), GFP_KERNEL);
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if (!ljca_i2c)
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return -ENOMEM;
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ljca_i2c->ljca = ljca;
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ljca_i2c->i2c_info = dev_get_platdata(&auxdev->dev);
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ljca_i2c->adap.owner = THIS_MODULE;
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ljca_i2c->adap.class = I2C_CLASS_HWMON;
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ljca_i2c->adap.algo = &ljca_i2c_algo;
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ljca_i2c->adap.quirks = &ljca_i2c_quirks;
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ljca_i2c->adap.dev.parent = &auxdev->dev;
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snprintf(ljca_i2c->adap.name, sizeof(ljca_i2c->adap.name), "%s-%s-%d",
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dev_name(&auxdev->dev), dev_name(auxdev->dev.parent),
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ljca_i2c->i2c_info->id);
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device_set_node(&ljca_i2c->adap.dev, dev_fwnode(&auxdev->dev));
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i2c_set_adapdata(&ljca_i2c->adap, ljca_i2c);
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auxiliary_set_drvdata(auxdev, ljca_i2c);
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ret = ljca_i2c_init(ljca_i2c, ljca_i2c->i2c_info->id);
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if (ret)
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return dev_err_probe(&auxdev->dev, -EIO,
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"i2c init failed id: %d\n",
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ljca_i2c->i2c_info->id);
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ret = devm_i2c_add_adapter(&auxdev->dev, &ljca_i2c->adap);
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if (ret)
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return ret;
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if (has_acpi_companion(&ljca_i2c->adap.dev))
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acpi_dev_clear_dependencies(ACPI_COMPANION(&ljca_i2c->adap.dev));
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return 0;
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}
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static void ljca_i2c_remove(struct auxiliary_device *auxdev)
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{
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struct ljca_i2c_dev *ljca_i2c = auxiliary_get_drvdata(auxdev);
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i2c_del_adapter(&ljca_i2c->adap);
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}
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static const struct auxiliary_device_id ljca_i2c_id_table[] = {
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{ "usb_ljca.ljca-i2c", 0 },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(auxiliary, ljca_i2c_id_table);
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static struct auxiliary_driver ljca_i2c_driver = {
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.probe = ljca_i2c_probe,
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.remove = ljca_i2c_remove,
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.id_table = ljca_i2c_id_table,
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};
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module_auxiliary_driver(ljca_i2c_driver);
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MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
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MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
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MODULE_AUTHOR("Lixu Zhang <lixu.zhang@intel.com>");
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MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-I2C driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(LJCA);
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