167a95c21SRishi Gupta // SPDX-License-Identifier: GPL-2.0-only 267a95c21SRishi Gupta /* 367a95c21SRishi Gupta * MCP2221A - Microchip USB to I2C Host Protocol Bridge 467a95c21SRishi Gupta * 567a95c21SRishi Gupta * Copyright (c) 2020, Rishi Gupta <gupt21@gmail.com> 667a95c21SRishi Gupta * 767a95c21SRishi Gupta * Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20005565B.pdf 867a95c21SRishi Gupta */ 967a95c21SRishi Gupta 1067a95c21SRishi Gupta #include <linux/module.h> 1167a95c21SRishi Gupta #include <linux/err.h> 1267a95c21SRishi Gupta #include <linux/mutex.h> 1367a95c21SRishi Gupta #include <linux/completion.h> 1467a95c21SRishi Gupta #include <linux/delay.h> 1567a95c21SRishi Gupta #include <linux/hid.h> 1667a95c21SRishi Gupta #include <linux/hidraw.h> 1767a95c21SRishi Gupta #include <linux/i2c.h> 18*328de1c5SRishi Gupta #include <linux/gpio/driver.h> 1967a95c21SRishi Gupta #include "hid-ids.h" 2067a95c21SRishi Gupta 2167a95c21SRishi Gupta /* Commands codes in a raw output report */ 2267a95c21SRishi Gupta enum { 2367a95c21SRishi Gupta MCP2221_I2C_WR_DATA = 0x90, 2467a95c21SRishi Gupta MCP2221_I2C_WR_NO_STOP = 0x94, 2567a95c21SRishi Gupta MCP2221_I2C_RD_DATA = 0x91, 2667a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START = 0x93, 2767a95c21SRishi Gupta MCP2221_I2C_GET_DATA = 0x40, 2867a95c21SRishi Gupta MCP2221_I2C_PARAM_OR_STATUS = 0x10, 2967a95c21SRishi Gupta MCP2221_I2C_SET_SPEED = 0x20, 3067a95c21SRishi Gupta MCP2221_I2C_CANCEL = 0x10, 31*328de1c5SRishi Gupta MCP2221_GPIO_SET = 0x50, 32*328de1c5SRishi Gupta MCP2221_GPIO_GET = 0x51, 3367a95c21SRishi Gupta }; 3467a95c21SRishi Gupta 3567a95c21SRishi Gupta /* Response codes in a raw input report */ 3667a95c21SRishi Gupta enum { 3767a95c21SRishi Gupta MCP2221_SUCCESS = 0x00, 3867a95c21SRishi Gupta MCP2221_I2C_ENG_BUSY = 0x01, 3967a95c21SRishi Gupta MCP2221_I2C_START_TOUT = 0x12, 4067a95c21SRishi Gupta MCP2221_I2C_STOP_TOUT = 0x62, 4167a95c21SRishi Gupta MCP2221_I2C_WRADDRL_TOUT = 0x23, 4267a95c21SRishi Gupta MCP2221_I2C_WRDATA_TOUT = 0x44, 4367a95c21SRishi Gupta MCP2221_I2C_WRADDRL_NACK = 0x25, 4467a95c21SRishi Gupta MCP2221_I2C_MASK_ADDR_NACK = 0x40, 4567a95c21SRishi Gupta MCP2221_I2C_WRADDRL_SEND = 0x21, 4667a95c21SRishi Gupta MCP2221_I2C_ADDR_NACK = 0x25, 4767a95c21SRishi Gupta MCP2221_I2C_READ_COMPL = 0x55, 48*328de1c5SRishi Gupta MCP2221_ALT_F_NOT_GPIOV = 0xEE, 49*328de1c5SRishi Gupta MCP2221_ALT_F_NOT_GPIOD = 0xEF, 5067a95c21SRishi Gupta }; 5167a95c21SRishi Gupta 5267a95c21SRishi Gupta /* 5367a95c21SRishi Gupta * There is no way to distinguish responses. Therefore next command 5467a95c21SRishi Gupta * is sent only after response to previous has been received. Mutex 5567a95c21SRishi Gupta * lock is used for this purpose mainly. 5667a95c21SRishi Gupta */ 5767a95c21SRishi Gupta struct mcp2221 { 5867a95c21SRishi Gupta struct hid_device *hdev; 5967a95c21SRishi Gupta struct i2c_adapter adapter; 6067a95c21SRishi Gupta struct mutex lock; 6167a95c21SRishi Gupta struct completion wait_in_report; 6267a95c21SRishi Gupta u8 *rxbuf; 6367a95c21SRishi Gupta u8 txbuf[64]; 6467a95c21SRishi Gupta int rxbuf_idx; 6567a95c21SRishi Gupta int status; 6667a95c21SRishi Gupta u8 cur_i2c_clk_div; 67*328de1c5SRishi Gupta struct gpio_chip *gc; 68*328de1c5SRishi Gupta u8 gp_idx; 69*328de1c5SRishi Gupta u8 gpio_dir; 7067a95c21SRishi Gupta }; 7167a95c21SRishi Gupta 7267a95c21SRishi Gupta /* 7367a95c21SRishi Gupta * Default i2c bus clock frequency 400 kHz. Modify this if you 7467a95c21SRishi Gupta * want to set some other frequency (min 50 kHz - max 400 kHz). 7567a95c21SRishi Gupta */ 7667a95c21SRishi Gupta static uint i2c_clk_freq = 400; 7767a95c21SRishi Gupta 7867a95c21SRishi Gupta /* Synchronously send output report to the device */ 7967a95c21SRishi Gupta static int mcp_send_report(struct mcp2221 *mcp, 8067a95c21SRishi Gupta u8 *out_report, size_t len) 8167a95c21SRishi Gupta { 8267a95c21SRishi Gupta u8 *buf; 8367a95c21SRishi Gupta int ret; 8467a95c21SRishi Gupta 8567a95c21SRishi Gupta buf = kmemdup(out_report, len, GFP_KERNEL); 8667a95c21SRishi Gupta if (!buf) 8767a95c21SRishi Gupta return -ENOMEM; 8867a95c21SRishi Gupta 8967a95c21SRishi Gupta /* mcp2221 uses interrupt endpoint for out reports */ 9067a95c21SRishi Gupta ret = hid_hw_output_report(mcp->hdev, buf, len); 9167a95c21SRishi Gupta kfree(buf); 9267a95c21SRishi Gupta 9367a95c21SRishi Gupta if (ret < 0) 9467a95c21SRishi Gupta return ret; 9567a95c21SRishi Gupta return 0; 9667a95c21SRishi Gupta } 9767a95c21SRishi Gupta 9867a95c21SRishi Gupta /* 9967a95c21SRishi Gupta * Send o/p report to the device and wait for i/p report to be 10067a95c21SRishi Gupta * received from the device. If the device does not respond, 10167a95c21SRishi Gupta * we timeout. 10267a95c21SRishi Gupta */ 10367a95c21SRishi Gupta static int mcp_send_data_req_status(struct mcp2221 *mcp, 10467a95c21SRishi Gupta u8 *out_report, int len) 10567a95c21SRishi Gupta { 10667a95c21SRishi Gupta int ret; 10767a95c21SRishi Gupta unsigned long t; 10867a95c21SRishi Gupta 10967a95c21SRishi Gupta reinit_completion(&mcp->wait_in_report); 11067a95c21SRishi Gupta 11167a95c21SRishi Gupta ret = mcp_send_report(mcp, out_report, len); 11267a95c21SRishi Gupta if (ret) 11367a95c21SRishi Gupta return ret; 11467a95c21SRishi Gupta 11567a95c21SRishi Gupta t = wait_for_completion_timeout(&mcp->wait_in_report, 11667a95c21SRishi Gupta msecs_to_jiffies(4000)); 11767a95c21SRishi Gupta if (!t) 11867a95c21SRishi Gupta return -ETIMEDOUT; 11967a95c21SRishi Gupta 12067a95c21SRishi Gupta return mcp->status; 12167a95c21SRishi Gupta } 12267a95c21SRishi Gupta 12367a95c21SRishi Gupta /* Check pass/fail for actual communication with i2c slave */ 12467a95c21SRishi Gupta static int mcp_chk_last_cmd_status(struct mcp2221 *mcp) 12567a95c21SRishi Gupta { 12667a95c21SRishi Gupta memset(mcp->txbuf, 0, 8); 12767a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; 12867a95c21SRishi Gupta 12967a95c21SRishi Gupta return mcp_send_data_req_status(mcp, mcp->txbuf, 8); 13067a95c21SRishi Gupta } 13167a95c21SRishi Gupta 13267a95c21SRishi Gupta /* Cancels last command releasing i2c bus just in case occupied */ 13367a95c21SRishi Gupta static int mcp_cancel_last_cmd(struct mcp2221 *mcp) 13467a95c21SRishi Gupta { 13567a95c21SRishi Gupta memset(mcp->txbuf, 0, 8); 13667a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; 13767a95c21SRishi Gupta mcp->txbuf[2] = MCP2221_I2C_CANCEL; 13867a95c21SRishi Gupta 13967a95c21SRishi Gupta return mcp_send_data_req_status(mcp, mcp->txbuf, 8); 14067a95c21SRishi Gupta } 14167a95c21SRishi Gupta 14267a95c21SRishi Gupta static int mcp_set_i2c_speed(struct mcp2221 *mcp) 14367a95c21SRishi Gupta { 14467a95c21SRishi Gupta int ret; 14567a95c21SRishi Gupta 14667a95c21SRishi Gupta memset(mcp->txbuf, 0, 8); 14767a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; 14867a95c21SRishi Gupta mcp->txbuf[3] = MCP2221_I2C_SET_SPEED; 14967a95c21SRishi Gupta mcp->txbuf[4] = mcp->cur_i2c_clk_div; 15067a95c21SRishi Gupta 15167a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 8); 15267a95c21SRishi Gupta if (ret) { 15367a95c21SRishi Gupta /* Small delay is needed here */ 15467a95c21SRishi Gupta usleep_range(980, 1000); 15567a95c21SRishi Gupta mcp_cancel_last_cmd(mcp); 15667a95c21SRishi Gupta } 15767a95c21SRishi Gupta 15867a95c21SRishi Gupta return 0; 15967a95c21SRishi Gupta } 16067a95c21SRishi Gupta 16167a95c21SRishi Gupta /* 16267a95c21SRishi Gupta * An output report can contain minimum 1 and maximum 60 user data 16367a95c21SRishi Gupta * bytes. If the number of data bytes is more then 60, we send it 16467a95c21SRishi Gupta * in chunks of 60 bytes. Last chunk may contain exactly 60 or less 16567a95c21SRishi Gupta * bytes. Total number of bytes is informed in very first report to 16667a95c21SRishi Gupta * mcp2221, from that point onwards it first collect all the data 16767a95c21SRishi Gupta * from host and then send to i2c slave device. 16867a95c21SRishi Gupta */ 16967a95c21SRishi Gupta static int mcp_i2c_write(struct mcp2221 *mcp, 17067a95c21SRishi Gupta struct i2c_msg *msg, int type, u8 last_status) 17167a95c21SRishi Gupta { 17267a95c21SRishi Gupta int ret, len, idx, sent; 17367a95c21SRishi Gupta 17467a95c21SRishi Gupta idx = 0; 17567a95c21SRishi Gupta sent = 0; 17667a95c21SRishi Gupta if (msg->len < 60) 17767a95c21SRishi Gupta len = msg->len; 17867a95c21SRishi Gupta else 17967a95c21SRishi Gupta len = 60; 18067a95c21SRishi Gupta 18167a95c21SRishi Gupta do { 18267a95c21SRishi Gupta mcp->txbuf[0] = type; 18367a95c21SRishi Gupta mcp->txbuf[1] = msg->len & 0xff; 18467a95c21SRishi Gupta mcp->txbuf[2] = msg->len >> 8; 18567a95c21SRishi Gupta mcp->txbuf[3] = (u8)(msg->addr << 1); 18667a95c21SRishi Gupta 18767a95c21SRishi Gupta memcpy(&mcp->txbuf[4], &msg->buf[idx], len); 18867a95c21SRishi Gupta 18967a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, len + 4); 19067a95c21SRishi Gupta if (ret) 19167a95c21SRishi Gupta return ret; 19267a95c21SRishi Gupta 19367a95c21SRishi Gupta usleep_range(980, 1000); 19467a95c21SRishi Gupta 19567a95c21SRishi Gupta if (last_status) { 19667a95c21SRishi Gupta ret = mcp_chk_last_cmd_status(mcp); 19767a95c21SRishi Gupta if (ret) 19867a95c21SRishi Gupta return ret; 19967a95c21SRishi Gupta } 20067a95c21SRishi Gupta 20167a95c21SRishi Gupta sent = sent + len; 20267a95c21SRishi Gupta if (sent >= msg->len) 20367a95c21SRishi Gupta break; 20467a95c21SRishi Gupta 20567a95c21SRishi Gupta idx = idx + len; 20667a95c21SRishi Gupta if ((msg->len - sent) < 60) 20767a95c21SRishi Gupta len = msg->len - sent; 20867a95c21SRishi Gupta else 20967a95c21SRishi Gupta len = 60; 21067a95c21SRishi Gupta 21167a95c21SRishi Gupta /* 21267a95c21SRishi Gupta * Testing shows delay is needed between successive writes 21367a95c21SRishi Gupta * otherwise next write fails on first-try from i2c core. 21467a95c21SRishi Gupta * This value is obtained through automated stress testing. 21567a95c21SRishi Gupta */ 21667a95c21SRishi Gupta usleep_range(980, 1000); 21767a95c21SRishi Gupta } while (len > 0); 21867a95c21SRishi Gupta 21967a95c21SRishi Gupta return ret; 22067a95c21SRishi Gupta } 22167a95c21SRishi Gupta 22267a95c21SRishi Gupta /* 22367a95c21SRishi Gupta * Device reads all data (0 - 65535 bytes) from i2c slave device and 22467a95c21SRishi Gupta * stores it in device itself. This data is read back from device to 22567a95c21SRishi Gupta * host in multiples of 60 bytes using input reports. 22667a95c21SRishi Gupta */ 22767a95c21SRishi Gupta static int mcp_i2c_smbus_read(struct mcp2221 *mcp, 22867a95c21SRishi Gupta struct i2c_msg *msg, int type, u16 smbus_addr, 22967a95c21SRishi Gupta u8 smbus_len, u8 *smbus_buf) 23067a95c21SRishi Gupta { 23167a95c21SRishi Gupta int ret; 23267a95c21SRishi Gupta u16 total_len; 23367a95c21SRishi Gupta 23467a95c21SRishi Gupta mcp->txbuf[0] = type; 23567a95c21SRishi Gupta if (msg) { 23667a95c21SRishi Gupta mcp->txbuf[1] = msg->len & 0xff; 23767a95c21SRishi Gupta mcp->txbuf[2] = msg->len >> 8; 23867a95c21SRishi Gupta mcp->txbuf[3] = (u8)(msg->addr << 1); 23967a95c21SRishi Gupta total_len = msg->len; 24067a95c21SRishi Gupta mcp->rxbuf = msg->buf; 24167a95c21SRishi Gupta } else { 24267a95c21SRishi Gupta mcp->txbuf[1] = smbus_len; 24367a95c21SRishi Gupta mcp->txbuf[2] = 0; 24467a95c21SRishi Gupta mcp->txbuf[3] = (u8)(smbus_addr << 1); 24567a95c21SRishi Gupta total_len = smbus_len; 24667a95c21SRishi Gupta mcp->rxbuf = smbus_buf; 24767a95c21SRishi Gupta } 24867a95c21SRishi Gupta 24967a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 4); 25067a95c21SRishi Gupta if (ret) 25167a95c21SRishi Gupta return ret; 25267a95c21SRishi Gupta 25367a95c21SRishi Gupta mcp->rxbuf_idx = 0; 25467a95c21SRishi Gupta 25567a95c21SRishi Gupta do { 25667a95c21SRishi Gupta memset(mcp->txbuf, 0, 4); 25767a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_GET_DATA; 25867a95c21SRishi Gupta 25967a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); 26067a95c21SRishi Gupta if (ret) 26167a95c21SRishi Gupta return ret; 26267a95c21SRishi Gupta 26367a95c21SRishi Gupta ret = mcp_chk_last_cmd_status(mcp); 26467a95c21SRishi Gupta if (ret) 26567a95c21SRishi Gupta return ret; 26667a95c21SRishi Gupta 26767a95c21SRishi Gupta usleep_range(980, 1000); 26867a95c21SRishi Gupta } while (mcp->rxbuf_idx < total_len); 26967a95c21SRishi Gupta 27067a95c21SRishi Gupta return ret; 27167a95c21SRishi Gupta } 27267a95c21SRishi Gupta 27367a95c21SRishi Gupta static int mcp_i2c_xfer(struct i2c_adapter *adapter, 27467a95c21SRishi Gupta struct i2c_msg msgs[], int num) 27567a95c21SRishi Gupta { 27667a95c21SRishi Gupta int ret; 27767a95c21SRishi Gupta struct mcp2221 *mcp = i2c_get_adapdata(adapter); 27867a95c21SRishi Gupta 27967a95c21SRishi Gupta hid_hw_power(mcp->hdev, PM_HINT_FULLON); 28067a95c21SRishi Gupta 28167a95c21SRishi Gupta mutex_lock(&mcp->lock); 28267a95c21SRishi Gupta 28367a95c21SRishi Gupta /* Setting speed before every transaction is required for mcp2221 */ 28467a95c21SRishi Gupta ret = mcp_set_i2c_speed(mcp); 28567a95c21SRishi Gupta if (ret) 28667a95c21SRishi Gupta goto exit; 28767a95c21SRishi Gupta 28867a95c21SRishi Gupta if (num == 1) { 28967a95c21SRishi Gupta if (msgs->flags & I2C_M_RD) { 29067a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, msgs, MCP2221_I2C_RD_DATA, 29167a95c21SRishi Gupta 0, 0, NULL); 29267a95c21SRishi Gupta } else { 29367a95c21SRishi Gupta ret = mcp_i2c_write(mcp, msgs, MCP2221_I2C_WR_DATA, 1); 29467a95c21SRishi Gupta } 29567a95c21SRishi Gupta if (ret) 29667a95c21SRishi Gupta goto exit; 29767a95c21SRishi Gupta ret = num; 29867a95c21SRishi Gupta } else if (num == 2) { 29967a95c21SRishi Gupta /* Ex transaction; send reg address and read its contents */ 30067a95c21SRishi Gupta if (msgs[0].addr == msgs[1].addr && 30167a95c21SRishi Gupta !(msgs[0].flags & I2C_M_RD) && 30267a95c21SRishi Gupta (msgs[1].flags & I2C_M_RD)) { 30367a95c21SRishi Gupta 30467a95c21SRishi Gupta ret = mcp_i2c_write(mcp, &msgs[0], 30567a95c21SRishi Gupta MCP2221_I2C_WR_NO_STOP, 0); 30667a95c21SRishi Gupta if (ret) 30767a95c21SRishi Gupta goto exit; 30867a95c21SRishi Gupta 30967a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, &msgs[1], 31067a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START, 31167a95c21SRishi Gupta 0, 0, NULL); 31267a95c21SRishi Gupta if (ret) 31367a95c21SRishi Gupta goto exit; 31467a95c21SRishi Gupta ret = num; 31567a95c21SRishi Gupta } else { 31667a95c21SRishi Gupta dev_err(&adapter->dev, 31767a95c21SRishi Gupta "unsupported multi-msg i2c transaction\n"); 31867a95c21SRishi Gupta ret = -EOPNOTSUPP; 31967a95c21SRishi Gupta } 32067a95c21SRishi Gupta } else { 32167a95c21SRishi Gupta dev_err(&adapter->dev, 32267a95c21SRishi Gupta "unsupported multi-msg i2c transaction\n"); 32367a95c21SRishi Gupta ret = -EOPNOTSUPP; 32467a95c21SRishi Gupta } 32567a95c21SRishi Gupta 32667a95c21SRishi Gupta exit: 32767a95c21SRishi Gupta hid_hw_power(mcp->hdev, PM_HINT_NORMAL); 32867a95c21SRishi Gupta mutex_unlock(&mcp->lock); 32967a95c21SRishi Gupta return ret; 33067a95c21SRishi Gupta } 33167a95c21SRishi Gupta 33267a95c21SRishi Gupta static int mcp_smbus_write(struct mcp2221 *mcp, u16 addr, 33367a95c21SRishi Gupta u8 command, u8 *buf, u8 len, int type, 33467a95c21SRishi Gupta u8 last_status) 33567a95c21SRishi Gupta { 33667a95c21SRishi Gupta int data_len, ret; 33767a95c21SRishi Gupta 33867a95c21SRishi Gupta mcp->txbuf[0] = type; 33967a95c21SRishi Gupta mcp->txbuf[1] = len + 1; /* 1 is due to command byte itself */ 34067a95c21SRishi Gupta mcp->txbuf[2] = 0; 34167a95c21SRishi Gupta mcp->txbuf[3] = (u8)(addr << 1); 34267a95c21SRishi Gupta mcp->txbuf[4] = command; 34367a95c21SRishi Gupta 34467a95c21SRishi Gupta switch (len) { 34567a95c21SRishi Gupta case 0: 34667a95c21SRishi Gupta data_len = 5; 34767a95c21SRishi Gupta break; 34867a95c21SRishi Gupta case 1: 34967a95c21SRishi Gupta mcp->txbuf[5] = buf[0]; 35067a95c21SRishi Gupta data_len = 6; 35167a95c21SRishi Gupta break; 35267a95c21SRishi Gupta case 2: 35367a95c21SRishi Gupta mcp->txbuf[5] = buf[0]; 35467a95c21SRishi Gupta mcp->txbuf[6] = buf[1]; 35567a95c21SRishi Gupta data_len = 7; 35667a95c21SRishi Gupta break; 35767a95c21SRishi Gupta default: 35867a95c21SRishi Gupta memcpy(&mcp->txbuf[5], buf, len); 35967a95c21SRishi Gupta data_len = len + 5; 36067a95c21SRishi Gupta } 36167a95c21SRishi Gupta 36267a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, data_len); 36367a95c21SRishi Gupta if (ret) 36467a95c21SRishi Gupta return ret; 36567a95c21SRishi Gupta 36667a95c21SRishi Gupta if (last_status) { 36767a95c21SRishi Gupta usleep_range(980, 1000); 36867a95c21SRishi Gupta 36967a95c21SRishi Gupta ret = mcp_chk_last_cmd_status(mcp); 37067a95c21SRishi Gupta if (ret) 37167a95c21SRishi Gupta return ret; 37267a95c21SRishi Gupta } 37367a95c21SRishi Gupta 37467a95c21SRishi Gupta return ret; 37567a95c21SRishi Gupta } 37667a95c21SRishi Gupta 37767a95c21SRishi Gupta static int mcp_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 37867a95c21SRishi Gupta unsigned short flags, char read_write, 37967a95c21SRishi Gupta u8 command, int size, 38067a95c21SRishi Gupta union i2c_smbus_data *data) 38167a95c21SRishi Gupta { 38267a95c21SRishi Gupta int ret; 38367a95c21SRishi Gupta struct mcp2221 *mcp = i2c_get_adapdata(adapter); 38467a95c21SRishi Gupta 38567a95c21SRishi Gupta hid_hw_power(mcp->hdev, PM_HINT_FULLON); 38667a95c21SRishi Gupta 38767a95c21SRishi Gupta mutex_lock(&mcp->lock); 38867a95c21SRishi Gupta 38967a95c21SRishi Gupta ret = mcp_set_i2c_speed(mcp); 39067a95c21SRishi Gupta if (ret) 39167a95c21SRishi Gupta goto exit; 39267a95c21SRishi Gupta 39367a95c21SRishi Gupta switch (size) { 39467a95c21SRishi Gupta 39567a95c21SRishi Gupta case I2C_SMBUS_QUICK: 39667a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) 39767a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, MCP2221_I2C_RD_DATA, 39867a95c21SRishi Gupta addr, 0, &data->byte); 39967a95c21SRishi Gupta else 40067a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 40167a95c21SRishi Gupta 0, MCP2221_I2C_WR_DATA, 1); 40267a95c21SRishi Gupta break; 40367a95c21SRishi Gupta case I2C_SMBUS_BYTE: 40467a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) 40567a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, MCP2221_I2C_RD_DATA, 40667a95c21SRishi Gupta addr, 1, &data->byte); 40767a95c21SRishi Gupta else 40867a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 40967a95c21SRishi Gupta 0, MCP2221_I2C_WR_DATA, 1); 41067a95c21SRishi Gupta break; 41167a95c21SRishi Gupta case I2C_SMBUS_BYTE_DATA: 41267a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) { 41367a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 41467a95c21SRishi Gupta 0, MCP2221_I2C_WR_NO_STOP, 0); 41567a95c21SRishi Gupta if (ret) 41667a95c21SRishi Gupta goto exit; 41767a95c21SRishi Gupta 41867a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, 41967a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START, 42067a95c21SRishi Gupta addr, 1, &data->byte); 42167a95c21SRishi Gupta } else { 42267a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, &data->byte, 42367a95c21SRishi Gupta 1, MCP2221_I2C_WR_DATA, 1); 42467a95c21SRishi Gupta } 42567a95c21SRishi Gupta break; 42667a95c21SRishi Gupta case I2C_SMBUS_WORD_DATA: 42767a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) { 42867a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 42967a95c21SRishi Gupta 0, MCP2221_I2C_WR_NO_STOP, 0); 43067a95c21SRishi Gupta if (ret) 43167a95c21SRishi Gupta goto exit; 43267a95c21SRishi Gupta 43367a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, 43467a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START, 43567a95c21SRishi Gupta addr, 2, (u8 *)&data->word); 43667a95c21SRishi Gupta } else { 43767a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, 43867a95c21SRishi Gupta (u8 *)&data->word, 2, 43967a95c21SRishi Gupta MCP2221_I2C_WR_DATA, 1); 44067a95c21SRishi Gupta } 44167a95c21SRishi Gupta break; 44267a95c21SRishi Gupta case I2C_SMBUS_BLOCK_DATA: 44367a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) { 44467a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 44567a95c21SRishi Gupta 0, MCP2221_I2C_WR_NO_STOP, 1); 44667a95c21SRishi Gupta if (ret) 44767a95c21SRishi Gupta goto exit; 44867a95c21SRishi Gupta 44967a95c21SRishi Gupta mcp->rxbuf_idx = 0; 45067a95c21SRishi Gupta mcp->rxbuf = data->block; 45167a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_GET_DATA; 45267a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); 45367a95c21SRishi Gupta if (ret) 45467a95c21SRishi Gupta goto exit; 45567a95c21SRishi Gupta } else { 45667a95c21SRishi Gupta if (!data->block[0]) { 45767a95c21SRishi Gupta ret = -EINVAL; 45867a95c21SRishi Gupta goto exit; 45967a95c21SRishi Gupta } 46067a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, data->block, 46167a95c21SRishi Gupta data->block[0] + 1, 46267a95c21SRishi Gupta MCP2221_I2C_WR_DATA, 1); 46367a95c21SRishi Gupta } 46467a95c21SRishi Gupta break; 46567a95c21SRishi Gupta case I2C_SMBUS_I2C_BLOCK_DATA: 46667a95c21SRishi Gupta if (read_write == I2C_SMBUS_READ) { 46767a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, NULL, 46867a95c21SRishi Gupta 0, MCP2221_I2C_WR_NO_STOP, 1); 46967a95c21SRishi Gupta if (ret) 47067a95c21SRishi Gupta goto exit; 47167a95c21SRishi Gupta 47267a95c21SRishi Gupta mcp->rxbuf_idx = 0; 47367a95c21SRishi Gupta mcp->rxbuf = data->block; 47467a95c21SRishi Gupta mcp->txbuf[0] = MCP2221_I2C_GET_DATA; 47567a95c21SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); 47667a95c21SRishi Gupta if (ret) 47767a95c21SRishi Gupta goto exit; 47867a95c21SRishi Gupta } else { 47967a95c21SRishi Gupta if (!data->block[0]) { 48067a95c21SRishi Gupta ret = -EINVAL; 48167a95c21SRishi Gupta goto exit; 48267a95c21SRishi Gupta } 48367a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, 48467a95c21SRishi Gupta &data->block[1], data->block[0], 48567a95c21SRishi Gupta MCP2221_I2C_WR_DATA, 1); 48667a95c21SRishi Gupta } 48767a95c21SRishi Gupta break; 48867a95c21SRishi Gupta case I2C_SMBUS_PROC_CALL: 48967a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, 49067a95c21SRishi Gupta (u8 *)&data->word, 49167a95c21SRishi Gupta 2, MCP2221_I2C_WR_NO_STOP, 0); 49267a95c21SRishi Gupta if (ret) 49367a95c21SRishi Gupta goto exit; 49467a95c21SRishi Gupta 49567a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, 49667a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START, 49767a95c21SRishi Gupta addr, 2, (u8 *)&data->word); 49867a95c21SRishi Gupta break; 49967a95c21SRishi Gupta case I2C_SMBUS_BLOCK_PROC_CALL: 50067a95c21SRishi Gupta ret = mcp_smbus_write(mcp, addr, command, data->block, 50167a95c21SRishi Gupta data->block[0] + 1, 50267a95c21SRishi Gupta MCP2221_I2C_WR_NO_STOP, 0); 50367a95c21SRishi Gupta if (ret) 50467a95c21SRishi Gupta goto exit; 50567a95c21SRishi Gupta 50667a95c21SRishi Gupta ret = mcp_i2c_smbus_read(mcp, NULL, 50767a95c21SRishi Gupta MCP2221_I2C_RD_RPT_START, 50867a95c21SRishi Gupta addr, I2C_SMBUS_BLOCK_MAX, 50967a95c21SRishi Gupta data->block); 51067a95c21SRishi Gupta break; 51167a95c21SRishi Gupta default: 51267a95c21SRishi Gupta dev_err(&mcp->adapter.dev, 51367a95c21SRishi Gupta "unsupported smbus transaction size:%d\n", size); 51467a95c21SRishi Gupta ret = -EOPNOTSUPP; 51567a95c21SRishi Gupta } 51667a95c21SRishi Gupta 51767a95c21SRishi Gupta exit: 51867a95c21SRishi Gupta hid_hw_power(mcp->hdev, PM_HINT_NORMAL); 51967a95c21SRishi Gupta mutex_unlock(&mcp->lock); 52067a95c21SRishi Gupta return ret; 52167a95c21SRishi Gupta } 52267a95c21SRishi Gupta 52367a95c21SRishi Gupta static u32 mcp_i2c_func(struct i2c_adapter *adapter) 52467a95c21SRishi Gupta { 52567a95c21SRishi Gupta return I2C_FUNC_I2C | 52667a95c21SRishi Gupta I2C_FUNC_SMBUS_READ_BLOCK_DATA | 52767a95c21SRishi Gupta I2C_FUNC_SMBUS_BLOCK_PROC_CALL | 52867a95c21SRishi Gupta (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_PEC); 52967a95c21SRishi Gupta } 53067a95c21SRishi Gupta 53167a95c21SRishi Gupta static const struct i2c_algorithm mcp_i2c_algo = { 53267a95c21SRishi Gupta .master_xfer = mcp_i2c_xfer, 53367a95c21SRishi Gupta .smbus_xfer = mcp_smbus_xfer, 53467a95c21SRishi Gupta .functionality = mcp_i2c_func, 53567a95c21SRishi Gupta }; 53667a95c21SRishi Gupta 537*328de1c5SRishi Gupta static int mcp_gpio_get(struct gpio_chip *gc, 538*328de1c5SRishi Gupta unsigned int offset) 539*328de1c5SRishi Gupta { 540*328de1c5SRishi Gupta int ret; 541*328de1c5SRishi Gupta struct mcp2221 *mcp = gpiochip_get_data(gc); 542*328de1c5SRishi Gupta 543*328de1c5SRishi Gupta mcp->txbuf[0] = MCP2221_GPIO_GET; 544*328de1c5SRishi Gupta 545*328de1c5SRishi Gupta mcp->gp_idx = (offset + 1) * 2; 546*328de1c5SRishi Gupta 547*328de1c5SRishi Gupta mutex_lock(&mcp->lock); 548*328de1c5SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); 549*328de1c5SRishi Gupta mutex_unlock(&mcp->lock); 550*328de1c5SRishi Gupta 551*328de1c5SRishi Gupta return ret; 552*328de1c5SRishi Gupta } 553*328de1c5SRishi Gupta 554*328de1c5SRishi Gupta static void mcp_gpio_set(struct gpio_chip *gc, 555*328de1c5SRishi Gupta unsigned int offset, int value) 556*328de1c5SRishi Gupta { 557*328de1c5SRishi Gupta struct mcp2221 *mcp = gpiochip_get_data(gc); 558*328de1c5SRishi Gupta 559*328de1c5SRishi Gupta memset(mcp->txbuf, 0, 18); 560*328de1c5SRishi Gupta mcp->txbuf[0] = MCP2221_GPIO_SET; 561*328de1c5SRishi Gupta 562*328de1c5SRishi Gupta mcp->gp_idx = ((offset + 1) * 4) - 1; 563*328de1c5SRishi Gupta 564*328de1c5SRishi Gupta mcp->txbuf[mcp->gp_idx - 1] = 1; 565*328de1c5SRishi Gupta mcp->txbuf[mcp->gp_idx] = !!value; 566*328de1c5SRishi Gupta 567*328de1c5SRishi Gupta mutex_lock(&mcp->lock); 568*328de1c5SRishi Gupta mcp_send_data_req_status(mcp, mcp->txbuf, 18); 569*328de1c5SRishi Gupta mutex_unlock(&mcp->lock); 570*328de1c5SRishi Gupta } 571*328de1c5SRishi Gupta 572*328de1c5SRishi Gupta static int mcp_gpio_dir_set(struct mcp2221 *mcp, 573*328de1c5SRishi Gupta unsigned int offset, u8 val) 574*328de1c5SRishi Gupta { 575*328de1c5SRishi Gupta memset(mcp->txbuf, 0, 18); 576*328de1c5SRishi Gupta mcp->txbuf[0] = MCP2221_GPIO_SET; 577*328de1c5SRishi Gupta 578*328de1c5SRishi Gupta mcp->gp_idx = (offset + 1) * 5; 579*328de1c5SRishi Gupta 580*328de1c5SRishi Gupta mcp->txbuf[mcp->gp_idx - 1] = 1; 581*328de1c5SRishi Gupta mcp->txbuf[mcp->gp_idx] = val; 582*328de1c5SRishi Gupta 583*328de1c5SRishi Gupta return mcp_send_data_req_status(mcp, mcp->txbuf, 18); 584*328de1c5SRishi Gupta } 585*328de1c5SRishi Gupta 586*328de1c5SRishi Gupta static int mcp_gpio_direction_input(struct gpio_chip *gc, 587*328de1c5SRishi Gupta unsigned int offset) 588*328de1c5SRishi Gupta { 589*328de1c5SRishi Gupta int ret; 590*328de1c5SRishi Gupta struct mcp2221 *mcp = gpiochip_get_data(gc); 591*328de1c5SRishi Gupta 592*328de1c5SRishi Gupta mutex_lock(&mcp->lock); 593*328de1c5SRishi Gupta ret = mcp_gpio_dir_set(mcp, offset, 0); 594*328de1c5SRishi Gupta mutex_unlock(&mcp->lock); 595*328de1c5SRishi Gupta 596*328de1c5SRishi Gupta return ret; 597*328de1c5SRishi Gupta } 598*328de1c5SRishi Gupta 599*328de1c5SRishi Gupta static int mcp_gpio_direction_output(struct gpio_chip *gc, 600*328de1c5SRishi Gupta unsigned int offset, int value) 601*328de1c5SRishi Gupta { 602*328de1c5SRishi Gupta int ret; 603*328de1c5SRishi Gupta struct mcp2221 *mcp = gpiochip_get_data(gc); 604*328de1c5SRishi Gupta 605*328de1c5SRishi Gupta mutex_lock(&mcp->lock); 606*328de1c5SRishi Gupta ret = mcp_gpio_dir_set(mcp, offset, 1); 607*328de1c5SRishi Gupta mutex_unlock(&mcp->lock); 608*328de1c5SRishi Gupta 609*328de1c5SRishi Gupta /* Can't configure as output, bailout early */ 610*328de1c5SRishi Gupta if (ret) 611*328de1c5SRishi Gupta return ret; 612*328de1c5SRishi Gupta 613*328de1c5SRishi Gupta mcp_gpio_set(gc, offset, value); 614*328de1c5SRishi Gupta 615*328de1c5SRishi Gupta return 0; 616*328de1c5SRishi Gupta } 617*328de1c5SRishi Gupta 618*328de1c5SRishi Gupta static int mcp_gpio_get_direction(struct gpio_chip *gc, 619*328de1c5SRishi Gupta unsigned int offset) 620*328de1c5SRishi Gupta { 621*328de1c5SRishi Gupta int ret; 622*328de1c5SRishi Gupta struct mcp2221 *mcp = gpiochip_get_data(gc); 623*328de1c5SRishi Gupta 624*328de1c5SRishi Gupta mcp->txbuf[0] = MCP2221_GPIO_GET; 625*328de1c5SRishi Gupta 626*328de1c5SRishi Gupta mcp->gp_idx = (offset + 1) * 2; 627*328de1c5SRishi Gupta 628*328de1c5SRishi Gupta mutex_lock(&mcp->lock); 629*328de1c5SRishi Gupta ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); 630*328de1c5SRishi Gupta mutex_unlock(&mcp->lock); 631*328de1c5SRishi Gupta 632*328de1c5SRishi Gupta if (ret) 633*328de1c5SRishi Gupta return ret; 634*328de1c5SRishi Gupta 635*328de1c5SRishi Gupta if (mcp->gpio_dir) 636*328de1c5SRishi Gupta return GPIO_LINE_DIRECTION_IN; 637*328de1c5SRishi Gupta 638*328de1c5SRishi Gupta return GPIO_LINE_DIRECTION_OUT; 639*328de1c5SRishi Gupta } 640*328de1c5SRishi Gupta 64167a95c21SRishi Gupta /* Gives current state of i2c engine inside mcp2221 */ 64267a95c21SRishi Gupta static int mcp_get_i2c_eng_state(struct mcp2221 *mcp, 64367a95c21SRishi Gupta u8 *data, u8 idx) 64467a95c21SRishi Gupta { 64567a95c21SRishi Gupta int ret; 64667a95c21SRishi Gupta 64767a95c21SRishi Gupta switch (data[idx]) { 64867a95c21SRishi Gupta case MCP2221_I2C_WRADDRL_NACK: 64967a95c21SRishi Gupta case MCP2221_I2C_WRADDRL_SEND: 65067a95c21SRishi Gupta ret = -ENXIO; 65167a95c21SRishi Gupta break; 65267a95c21SRishi Gupta case MCP2221_I2C_START_TOUT: 65367a95c21SRishi Gupta case MCP2221_I2C_STOP_TOUT: 65467a95c21SRishi Gupta case MCP2221_I2C_WRADDRL_TOUT: 65567a95c21SRishi Gupta case MCP2221_I2C_WRDATA_TOUT: 65667a95c21SRishi Gupta ret = -ETIMEDOUT; 65767a95c21SRishi Gupta break; 65867a95c21SRishi Gupta case MCP2221_I2C_ENG_BUSY: 65967a95c21SRishi Gupta ret = -EAGAIN; 66067a95c21SRishi Gupta break; 66167a95c21SRishi Gupta case MCP2221_SUCCESS: 66267a95c21SRishi Gupta ret = 0x00; 66367a95c21SRishi Gupta break; 66467a95c21SRishi Gupta default: 66567a95c21SRishi Gupta ret = -EIO; 66667a95c21SRishi Gupta } 66767a95c21SRishi Gupta 66867a95c21SRishi Gupta return ret; 66967a95c21SRishi Gupta } 67067a95c21SRishi Gupta 67167a95c21SRishi Gupta /* 67267a95c21SRishi Gupta * MCP2221 uses interrupt endpoint for input reports. This function 67367a95c21SRishi Gupta * is called by HID layer when it receives i/p report from mcp2221, 67467a95c21SRishi Gupta * which is actually a response to the previously sent command. 67567a95c21SRishi Gupta * 67667a95c21SRishi Gupta * MCP2221A firmware specific return codes are parsed and 0 or 67767a95c21SRishi Gupta * appropriate negative error code is returned. Delayed response 67867a95c21SRishi Gupta * results in timeout error and stray reponses results in -EIO. 67967a95c21SRishi Gupta */ 68067a95c21SRishi Gupta static int mcp2221_raw_event(struct hid_device *hdev, 68167a95c21SRishi Gupta struct hid_report *report, u8 *data, int size) 68267a95c21SRishi Gupta { 68367a95c21SRishi Gupta u8 *buf; 68467a95c21SRishi Gupta struct mcp2221 *mcp = hid_get_drvdata(hdev); 68567a95c21SRishi Gupta 68667a95c21SRishi Gupta switch (data[0]) { 68767a95c21SRishi Gupta 68867a95c21SRishi Gupta case MCP2221_I2C_WR_DATA: 68967a95c21SRishi Gupta case MCP2221_I2C_WR_NO_STOP: 69067a95c21SRishi Gupta case MCP2221_I2C_RD_DATA: 69167a95c21SRishi Gupta case MCP2221_I2C_RD_RPT_START: 69267a95c21SRishi Gupta switch (data[1]) { 69367a95c21SRishi Gupta case MCP2221_SUCCESS: 69467a95c21SRishi Gupta mcp->status = 0; 69567a95c21SRishi Gupta break; 69667a95c21SRishi Gupta default: 69767a95c21SRishi Gupta mcp->status = mcp_get_i2c_eng_state(mcp, data, 2); 69867a95c21SRishi Gupta } 69967a95c21SRishi Gupta complete(&mcp->wait_in_report); 70067a95c21SRishi Gupta break; 70167a95c21SRishi Gupta 70267a95c21SRishi Gupta case MCP2221_I2C_PARAM_OR_STATUS: 70367a95c21SRishi Gupta switch (data[1]) { 70467a95c21SRishi Gupta case MCP2221_SUCCESS: 70567a95c21SRishi Gupta if ((mcp->txbuf[3] == MCP2221_I2C_SET_SPEED) && 70667a95c21SRishi Gupta (data[3] != MCP2221_I2C_SET_SPEED)) { 70767a95c21SRishi Gupta mcp->status = -EAGAIN; 70867a95c21SRishi Gupta break; 70967a95c21SRishi Gupta } 71067a95c21SRishi Gupta if (data[20] & MCP2221_I2C_MASK_ADDR_NACK) { 71167a95c21SRishi Gupta mcp->status = -ENXIO; 71267a95c21SRishi Gupta break; 71367a95c21SRishi Gupta } 71467a95c21SRishi Gupta mcp->status = mcp_get_i2c_eng_state(mcp, data, 8); 71567a95c21SRishi Gupta break; 71667a95c21SRishi Gupta default: 71767a95c21SRishi Gupta mcp->status = -EIO; 71867a95c21SRishi Gupta } 71967a95c21SRishi Gupta complete(&mcp->wait_in_report); 72067a95c21SRishi Gupta break; 72167a95c21SRishi Gupta 72267a95c21SRishi Gupta case MCP2221_I2C_GET_DATA: 72367a95c21SRishi Gupta switch (data[1]) { 72467a95c21SRishi Gupta case MCP2221_SUCCESS: 72567a95c21SRishi Gupta if (data[2] == MCP2221_I2C_ADDR_NACK) { 72667a95c21SRishi Gupta mcp->status = -ENXIO; 72767a95c21SRishi Gupta break; 72867a95c21SRishi Gupta } 72967a95c21SRishi Gupta if (!mcp_get_i2c_eng_state(mcp, data, 2) 73067a95c21SRishi Gupta && (data[3] == 0)) { 73167a95c21SRishi Gupta mcp->status = 0; 73267a95c21SRishi Gupta break; 73367a95c21SRishi Gupta } 73467a95c21SRishi Gupta if (data[3] == 127) { 73567a95c21SRishi Gupta mcp->status = -EIO; 73667a95c21SRishi Gupta break; 73767a95c21SRishi Gupta } 73867a95c21SRishi Gupta if (data[2] == MCP2221_I2C_READ_COMPL) { 73967a95c21SRishi Gupta buf = mcp->rxbuf; 74067a95c21SRishi Gupta memcpy(&buf[mcp->rxbuf_idx], &data[4], data[3]); 74167a95c21SRishi Gupta mcp->rxbuf_idx = mcp->rxbuf_idx + data[3]; 74267a95c21SRishi Gupta mcp->status = 0; 74367a95c21SRishi Gupta break; 74467a95c21SRishi Gupta } 74567a95c21SRishi Gupta mcp->status = -EIO; 74667a95c21SRishi Gupta break; 74767a95c21SRishi Gupta default: 74867a95c21SRishi Gupta mcp->status = -EIO; 74967a95c21SRishi Gupta } 75067a95c21SRishi Gupta complete(&mcp->wait_in_report); 75167a95c21SRishi Gupta break; 75267a95c21SRishi Gupta 753*328de1c5SRishi Gupta case MCP2221_GPIO_GET: 754*328de1c5SRishi Gupta switch (data[1]) { 755*328de1c5SRishi Gupta case MCP2221_SUCCESS: 756*328de1c5SRishi Gupta if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || 757*328de1c5SRishi Gupta (data[mcp->gp_idx + 1] == MCP2221_ALT_F_NOT_GPIOD)) { 758*328de1c5SRishi Gupta mcp->status = -ENOENT; 759*328de1c5SRishi Gupta } else { 760*328de1c5SRishi Gupta mcp->status = !!data[mcp->gp_idx]; 761*328de1c5SRishi Gupta mcp->gpio_dir = !!data[mcp->gp_idx + 1]; 762*328de1c5SRishi Gupta } 763*328de1c5SRishi Gupta break; 764*328de1c5SRishi Gupta default: 765*328de1c5SRishi Gupta mcp->status = -EAGAIN; 766*328de1c5SRishi Gupta } 767*328de1c5SRishi Gupta complete(&mcp->wait_in_report); 768*328de1c5SRishi Gupta break; 769*328de1c5SRishi Gupta 770*328de1c5SRishi Gupta case MCP2221_GPIO_SET: 771*328de1c5SRishi Gupta switch (data[1]) { 772*328de1c5SRishi Gupta case MCP2221_SUCCESS: 773*328de1c5SRishi Gupta if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || 774*328de1c5SRishi Gupta (data[mcp->gp_idx - 1] == MCP2221_ALT_F_NOT_GPIOV)) { 775*328de1c5SRishi Gupta mcp->status = -ENOENT; 776*328de1c5SRishi Gupta } else { 777*328de1c5SRishi Gupta mcp->status = 0; 778*328de1c5SRishi Gupta } 779*328de1c5SRishi Gupta break; 780*328de1c5SRishi Gupta default: 781*328de1c5SRishi Gupta mcp->status = -EAGAIN; 782*328de1c5SRishi Gupta } 783*328de1c5SRishi Gupta complete(&mcp->wait_in_report); 784*328de1c5SRishi Gupta break; 785*328de1c5SRishi Gupta 78667a95c21SRishi Gupta default: 78767a95c21SRishi Gupta mcp->status = -EIO; 78867a95c21SRishi Gupta complete(&mcp->wait_in_report); 78967a95c21SRishi Gupta } 79067a95c21SRishi Gupta 79167a95c21SRishi Gupta return 1; 79267a95c21SRishi Gupta } 79367a95c21SRishi Gupta 79467a95c21SRishi Gupta static int mcp2221_probe(struct hid_device *hdev, 79567a95c21SRishi Gupta const struct hid_device_id *id) 79667a95c21SRishi Gupta { 79767a95c21SRishi Gupta int ret; 79867a95c21SRishi Gupta struct mcp2221 *mcp; 79967a95c21SRishi Gupta 80067a95c21SRishi Gupta mcp = devm_kzalloc(&hdev->dev, sizeof(*mcp), GFP_KERNEL); 80167a95c21SRishi Gupta if (!mcp) 80267a95c21SRishi Gupta return -ENOMEM; 80367a95c21SRishi Gupta 80467a95c21SRishi Gupta ret = hid_parse(hdev); 80567a95c21SRishi Gupta if (ret) { 80667a95c21SRishi Gupta hid_err(hdev, "can't parse reports\n"); 80767a95c21SRishi Gupta return ret; 80867a95c21SRishi Gupta } 80967a95c21SRishi Gupta 81067a95c21SRishi Gupta ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 81167a95c21SRishi Gupta if (ret) { 81267a95c21SRishi Gupta hid_err(hdev, "can't start hardware\n"); 81367a95c21SRishi Gupta return ret; 81467a95c21SRishi Gupta } 81567a95c21SRishi Gupta 81667a95c21SRishi Gupta ret = hid_hw_open(hdev); 81767a95c21SRishi Gupta if (ret) { 81867a95c21SRishi Gupta hid_err(hdev, "can't open device\n"); 81967a95c21SRishi Gupta goto err_hstop; 82067a95c21SRishi Gupta } 82167a95c21SRishi Gupta 82267a95c21SRishi Gupta mutex_init(&mcp->lock); 82367a95c21SRishi Gupta init_completion(&mcp->wait_in_report); 82467a95c21SRishi Gupta hid_set_drvdata(hdev, mcp); 82567a95c21SRishi Gupta mcp->hdev = hdev; 82667a95c21SRishi Gupta 82767a95c21SRishi Gupta /* Set I2C bus clock diviser */ 82867a95c21SRishi Gupta if (i2c_clk_freq > 400) 82967a95c21SRishi Gupta i2c_clk_freq = 400; 83067a95c21SRishi Gupta if (i2c_clk_freq < 50) 83167a95c21SRishi Gupta i2c_clk_freq = 50; 83267a95c21SRishi Gupta mcp->cur_i2c_clk_div = (12000000 / (i2c_clk_freq * 1000)) - 3; 83367a95c21SRishi Gupta 83467a95c21SRishi Gupta mcp->adapter.owner = THIS_MODULE; 83567a95c21SRishi Gupta mcp->adapter.class = I2C_CLASS_HWMON; 83667a95c21SRishi Gupta mcp->adapter.algo = &mcp_i2c_algo; 83767a95c21SRishi Gupta mcp->adapter.retries = 1; 83867a95c21SRishi Gupta mcp->adapter.dev.parent = &hdev->dev; 83967a95c21SRishi Gupta snprintf(mcp->adapter.name, sizeof(mcp->adapter.name), 84067a95c21SRishi Gupta "MCP2221 usb-i2c bridge on hidraw%d", 84167a95c21SRishi Gupta ((struct hidraw *)hdev->hidraw)->minor); 84267a95c21SRishi Gupta 84367a95c21SRishi Gupta ret = i2c_add_adapter(&mcp->adapter); 84467a95c21SRishi Gupta if (ret) { 84567a95c21SRishi Gupta hid_err(hdev, "can't add usb-i2c adapter: %d\n", ret); 84667a95c21SRishi Gupta goto err_i2c; 84767a95c21SRishi Gupta } 84867a95c21SRishi Gupta i2c_set_adapdata(&mcp->adapter, mcp); 84967a95c21SRishi Gupta 850*328de1c5SRishi Gupta /* Setup GPIO chip */ 851*328de1c5SRishi Gupta mcp->gc = devm_kzalloc(&hdev->dev, sizeof(*mcp->gc), GFP_KERNEL); 852*328de1c5SRishi Gupta if (!mcp->gc) { 853*328de1c5SRishi Gupta ret = -ENOMEM; 854*328de1c5SRishi Gupta goto err_gc; 855*328de1c5SRishi Gupta } 856*328de1c5SRishi Gupta 857*328de1c5SRishi Gupta mcp->gc->label = "mcp2221_gpio"; 858*328de1c5SRishi Gupta mcp->gc->direction_input = mcp_gpio_direction_input; 859*328de1c5SRishi Gupta mcp->gc->direction_output = mcp_gpio_direction_output; 860*328de1c5SRishi Gupta mcp->gc->get_direction = mcp_gpio_get_direction; 861*328de1c5SRishi Gupta mcp->gc->set = mcp_gpio_set; 862*328de1c5SRishi Gupta mcp->gc->get = mcp_gpio_get; 863*328de1c5SRishi Gupta mcp->gc->ngpio = 4; 864*328de1c5SRishi Gupta mcp->gc->base = -1; 865*328de1c5SRishi Gupta mcp->gc->can_sleep = 1; 866*328de1c5SRishi Gupta mcp->gc->parent = &hdev->dev; 867*328de1c5SRishi Gupta 868*328de1c5SRishi Gupta ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp); 869*328de1c5SRishi Gupta if (ret) 870*328de1c5SRishi Gupta goto err_gc; 871*328de1c5SRishi Gupta 87267a95c21SRishi Gupta return 0; 87367a95c21SRishi Gupta 874*328de1c5SRishi Gupta err_gc: 875*328de1c5SRishi Gupta i2c_del_adapter(&mcp->adapter); 87667a95c21SRishi Gupta err_i2c: 87767a95c21SRishi Gupta hid_hw_close(mcp->hdev); 87867a95c21SRishi Gupta err_hstop: 87967a95c21SRishi Gupta hid_hw_stop(mcp->hdev); 88067a95c21SRishi Gupta return ret; 88167a95c21SRishi Gupta } 88267a95c21SRishi Gupta 88367a95c21SRishi Gupta static void mcp2221_remove(struct hid_device *hdev) 88467a95c21SRishi Gupta { 88567a95c21SRishi Gupta struct mcp2221 *mcp = hid_get_drvdata(hdev); 88667a95c21SRishi Gupta 88767a95c21SRishi Gupta i2c_del_adapter(&mcp->adapter); 88867a95c21SRishi Gupta hid_hw_close(mcp->hdev); 88967a95c21SRishi Gupta hid_hw_stop(mcp->hdev); 89067a95c21SRishi Gupta } 89167a95c21SRishi Gupta 89267a95c21SRishi Gupta static const struct hid_device_id mcp2221_devices[] = { 89367a95c21SRishi Gupta { HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_MCP2221) }, 89467a95c21SRishi Gupta { } 89567a95c21SRishi Gupta }; 89667a95c21SRishi Gupta MODULE_DEVICE_TABLE(hid, mcp2221_devices); 89767a95c21SRishi Gupta 89867a95c21SRishi Gupta static struct hid_driver mcp2221_driver = { 89967a95c21SRishi Gupta .name = "mcp2221", 90067a95c21SRishi Gupta .id_table = mcp2221_devices, 90167a95c21SRishi Gupta .probe = mcp2221_probe, 90267a95c21SRishi Gupta .remove = mcp2221_remove, 90367a95c21SRishi Gupta .raw_event = mcp2221_raw_event, 90467a95c21SRishi Gupta }; 90567a95c21SRishi Gupta 90667a95c21SRishi Gupta /* Register with HID core */ 90767a95c21SRishi Gupta module_hid_driver(mcp2221_driver); 90867a95c21SRishi Gupta 90967a95c21SRishi Gupta MODULE_AUTHOR("Rishi Gupta <gupt21@gmail.com>"); 91067a95c21SRishi Gupta MODULE_DESCRIPTION("MCP2221 Microchip HID USB to I2C master bridge"); 91167a95c21SRishi Gupta MODULE_LICENSE("GPL v2"); 912