1317 lines
32 KiB
C
1317 lines
32 KiB
C
/*
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* HID over I2C protocol implementation
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*
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* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
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* Copyright (c) 2012 Red Hat, Inc
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*
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* This code is partly based on "USB HID support for Linux":
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2007-2008 Oliver Neukum
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* Copyright (c) 2006-2010 Jiri Kosina
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/device.h>
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#include <linux/wait.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/hid.h>
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#include <linux/mutex.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <linux/platform_data/i2c-hid.h>
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#include "../hid-ids.h"
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/* quirks to control the device */
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#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0)
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#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
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#define I2C_HID_QUIRK_RESEND_REPORT_DESCR BIT(2)
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/* flags */
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#define I2C_HID_STARTED 0
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#define I2C_HID_RESET_PENDING 1
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#define I2C_HID_READ_PENDING 2
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#define I2C_HID_PWR_ON 0x00
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#define I2C_HID_PWR_SLEEP 0x01
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/* debug option */
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static bool debug;
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module_param(debug, bool, 0444);
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MODULE_PARM_DESC(debug, "print a lot of debug information");
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#define i2c_hid_dbg(ihid, fmt, arg...) \
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do { \
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if (debug) \
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dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
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} while (0)
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struct i2c_hid_desc {
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__le16 wHIDDescLength;
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__le16 bcdVersion;
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__le16 wReportDescLength;
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__le16 wReportDescRegister;
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__le16 wInputRegister;
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__le16 wMaxInputLength;
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__le16 wOutputRegister;
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__le16 wMaxOutputLength;
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__le16 wCommandRegister;
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__le16 wDataRegister;
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__le16 wVendorID;
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__le16 wProductID;
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__le16 wVersionID;
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__le32 reserved;
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} __packed;
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struct i2c_hid_cmd {
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unsigned int registerIndex;
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__u8 opcode;
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unsigned int length;
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bool wait;
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};
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union command {
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u8 data[0];
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struct cmd {
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__le16 reg;
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__u8 reportTypeID;
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__u8 opcode;
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} __packed c;
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};
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#define I2C_HID_CMD(opcode_) \
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.opcode = opcode_, .length = 4, \
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.registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
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/* fetch HID descriptor */
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static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
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/* fetch report descriptors */
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static const struct i2c_hid_cmd hid_report_descr_cmd = {
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.registerIndex = offsetof(struct i2c_hid_desc,
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wReportDescRegister),
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.opcode = 0x00,
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.length = 2 };
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/* commands */
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static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01),
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.wait = true };
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static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) };
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static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) };
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static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) };
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static const struct i2c_hid_cmd hid_no_cmd = { .length = 0 };
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/*
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* These definitions are not used here, but are defined by the spec.
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* Keeping them here for documentation purposes.
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*
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* static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
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* static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
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* static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
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* static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
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*/
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/* The main device structure */
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struct i2c_hid {
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struct i2c_client *client; /* i2c client */
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struct hid_device *hid; /* pointer to corresponding HID dev */
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union {
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__u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
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struct i2c_hid_desc hdesc; /* the HID Descriptor */
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};
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__le16 wHIDDescRegister; /* location of the i2c
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* register of the HID
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* descriptor. */
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unsigned int bufsize; /* i2c buffer size */
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u8 *inbuf; /* Input buffer */
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u8 *rawbuf; /* Raw Input buffer */
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u8 *cmdbuf; /* Command buffer */
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u8 *argsbuf; /* Command arguments buffer */
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unsigned long flags; /* device flags */
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unsigned long quirks; /* Various quirks */
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wait_queue_head_t wait; /* For waiting the interrupt */
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struct i2c_hid_platform_data pdata;
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bool irq_wake_enabled;
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struct mutex reset_lock;
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};
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static const struct i2c_hid_quirks {
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__u16 idVendor;
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__u16 idProduct;
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__u32 quirks;
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} i2c_hid_quirks[] = {
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{ USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
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I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
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{ USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
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I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
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{ I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
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I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
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{ I2C_VENDOR_ID_RAYD, I2C_PRODUCT_ID_RAYD_3118,
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I2C_HID_QUIRK_RESEND_REPORT_DESCR },
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{ USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS10FB_TOUCH,
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I2C_HID_QUIRK_RESEND_REPORT_DESCR },
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{ 0, 0 }
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};
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/*
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* i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
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* @idVendor: the 16-bit vendor ID
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* @idProduct: the 16-bit product ID
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*
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* Returns: a u32 quirks value.
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*/
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static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
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{
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u32 quirks = 0;
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int n;
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for (n = 0; i2c_hid_quirks[n].idVendor; n++)
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if (i2c_hid_quirks[n].idVendor == idVendor &&
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(i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
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i2c_hid_quirks[n].idProduct == idProduct))
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quirks = i2c_hid_quirks[n].quirks;
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return quirks;
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}
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static int __i2c_hid_command(struct i2c_client *client,
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const struct i2c_hid_cmd *command, u8 reportID,
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u8 reportType, u8 *args, int args_len,
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unsigned char *buf_recv, int data_len)
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{
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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union command *cmd = (union command *)ihid->cmdbuf;
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int ret;
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struct i2c_msg msg[2];
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int msg_num = 1;
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int length = command->length;
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bool wait = command->wait;
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unsigned int registerIndex = command->registerIndex;
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/* special case for hid_descr_cmd */
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if (command == &hid_descr_cmd) {
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cmd->c.reg = ihid->wHIDDescRegister;
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} else {
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cmd->data[0] = ihid->hdesc_buffer[registerIndex];
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cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
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}
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if (length > 2) {
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cmd->c.opcode = command->opcode;
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cmd->c.reportTypeID = reportID | reportType << 4;
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}
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memcpy(cmd->data + length, args, args_len);
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length += args_len;
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i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
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msg[0].addr = client->addr;
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msg[0].flags = client->flags & I2C_M_TEN;
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msg[0].len = length;
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msg[0].buf = cmd->data;
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if (data_len > 0) {
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msg[1].addr = client->addr;
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msg[1].flags = client->flags & I2C_M_TEN;
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msg[1].flags |= I2C_M_RD;
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msg[1].len = data_len;
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msg[1].buf = buf_recv;
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msg_num = 2;
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set_bit(I2C_HID_READ_PENDING, &ihid->flags);
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}
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if (wait)
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set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
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ret = i2c_transfer(client->adapter, msg, msg_num);
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if (data_len > 0)
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clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
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if (ret != msg_num)
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return ret < 0 ? ret : -EIO;
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ret = 0;
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if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
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msleep(100);
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} else if (wait) {
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i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
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if (!wait_event_timeout(ihid->wait,
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!test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
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msecs_to_jiffies(5000)))
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ret = -ENODATA;
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i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
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}
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return ret;
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}
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static int i2c_hid_command(struct i2c_client *client,
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const struct i2c_hid_cmd *command,
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unsigned char *buf_recv, int data_len)
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{
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return __i2c_hid_command(client, command, 0, 0, NULL, 0,
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buf_recv, data_len);
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}
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static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
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u8 reportID, unsigned char *buf_recv, int data_len)
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{
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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u8 args[3];
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int ret;
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int args_len = 0;
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u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
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i2c_hid_dbg(ihid, "%s\n", __func__);
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if (reportID >= 0x0F) {
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args[args_len++] = reportID;
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reportID = 0x0F;
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}
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args[args_len++] = readRegister & 0xFF;
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args[args_len++] = readRegister >> 8;
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ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
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reportType, args, args_len, buf_recv, data_len);
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if (ret) {
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dev_err(&client->dev,
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"failed to retrieve report from device.\n");
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return ret;
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}
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return 0;
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}
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/**
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* i2c_hid_set_or_send_report: forward an incoming report to the device
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* @client: the i2c_client of the device
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* @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
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* @reportID: the report ID
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* @buf: the actual data to transfer, without the report ID
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* @len: size of buf
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* @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
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*/
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static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
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u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
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{
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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u8 *args = ihid->argsbuf;
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const struct i2c_hid_cmd *hidcmd;
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int ret;
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u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
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u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
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u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
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u16 size;
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int args_len;
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int index = 0;
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i2c_hid_dbg(ihid, "%s\n", __func__);
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if (data_len > ihid->bufsize)
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return -EINVAL;
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size = 2 /* size */ +
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(reportID ? 1 : 0) /* reportID */ +
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data_len /* buf */;
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args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
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2 /* dataRegister */ +
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size /* args */;
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if (!use_data && maxOutputLength == 0)
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return -ENOSYS;
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if (reportID >= 0x0F) {
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args[index++] = reportID;
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reportID = 0x0F;
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}
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/*
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* use the data register for feature reports or if the device does not
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* support the output register
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*/
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if (use_data) {
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args[index++] = dataRegister & 0xFF;
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args[index++] = dataRegister >> 8;
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hidcmd = &hid_set_report_cmd;
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} else {
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args[index++] = outputRegister & 0xFF;
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args[index++] = outputRegister >> 8;
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hidcmd = &hid_no_cmd;
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}
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args[index++] = size & 0xFF;
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args[index++] = size >> 8;
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if (reportID)
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args[index++] = reportID;
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memcpy(&args[index], buf, data_len);
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ret = __i2c_hid_command(client, hidcmd, reportID,
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reportType, args, args_len, NULL, 0);
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if (ret) {
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dev_err(&client->dev, "failed to set a report to device.\n");
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return ret;
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}
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return data_len;
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}
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static int i2c_hid_set_power(struct i2c_client *client, int power_state)
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{
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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int ret;
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i2c_hid_dbg(ihid, "%s\n", __func__);
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/*
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* Some devices require to send a command to wakeup before power on.
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* The call will get a return value (EREMOTEIO) but device will be
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* triggered and activated. After that, it goes like a normal device.
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*/
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if (power_state == I2C_HID_PWR_ON &&
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ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
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ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
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/* Device was already activated */
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if (!ret)
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goto set_pwr_exit;
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}
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ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
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0, NULL, 0, NULL, 0);
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if (ret)
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dev_err(&client->dev, "failed to change power setting.\n");
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set_pwr_exit:
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return ret;
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}
|
|
|
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static int i2c_hid_hwreset(struct i2c_client *client)
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{
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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int ret;
|
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i2c_hid_dbg(ihid, "%s\n", __func__);
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|
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/*
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* This prevents sending feature reports while the device is
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* being reset. Otherwise we may lose the reset complete
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* interrupt.
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*/
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mutex_lock(&ihid->reset_lock);
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ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
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if (ret)
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goto out_unlock;
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|
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/*
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* The HID over I2C specification states that if a DEVICE needs time
|
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* after the PWR_ON request, it should utilise CLOCK stretching.
|
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* However, it has been observered that the Windows driver provides a
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* 1ms sleep between the PWR_ON and RESET requests and that some devices
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* rely on this.
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*/
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usleep_range(1000, 5000);
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i2c_hid_dbg(ihid, "resetting...\n");
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ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
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if (ret) {
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dev_err(&client->dev, "failed to reset device.\n");
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i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
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}
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out_unlock:
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mutex_unlock(&ihid->reset_lock);
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return ret;
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}
|
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|
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static void i2c_hid_get_input(struct i2c_hid *ihid)
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{
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int ret;
|
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u32 ret_size;
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int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
|
|
|
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if (size > ihid->bufsize)
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size = ihid->bufsize;
|
|
|
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ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
|
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if (ret != size) {
|
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if (ret < 0)
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return;
|
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|
|
dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
|
|
__func__, ret, size);
|
|
return;
|
|
}
|
|
|
|
ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
|
|
|
|
if (!ret_size) {
|
|
/* host or device initiated RESET completed */
|
|
if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
|
|
wake_up(&ihid->wait);
|
|
return;
|
|
}
|
|
|
|
if ((ret_size > size) || (ret_size < 2)) {
|
|
dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
|
|
__func__, size, ret_size);
|
|
return;
|
|
}
|
|
|
|
i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
|
|
|
|
if (test_bit(I2C_HID_STARTED, &ihid->flags))
|
|
hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
|
|
ret_size - 2, 1);
|
|
|
|
return;
|
|
}
|
|
|
|
static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
|
|
{
|
|
struct i2c_hid *ihid = dev_id;
|
|
|
|
if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
|
|
return IRQ_HANDLED;
|
|
|
|
i2c_hid_get_input(ihid);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int i2c_hid_get_report_length(struct hid_report *report)
|
|
{
|
|
return ((report->size - 1) >> 3) + 1 +
|
|
report->device->report_enum[report->type].numbered + 2;
|
|
}
|
|
|
|
/*
|
|
* Traverse the supplied list of reports and find the longest
|
|
*/
|
|
static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
|
|
unsigned int *max)
|
|
{
|
|
struct hid_report *report;
|
|
unsigned int size;
|
|
|
|
/* We should not rely on wMaxInputLength, as some devices may set it to
|
|
* a wrong length. */
|
|
list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
|
|
size = i2c_hid_get_report_length(report);
|
|
if (*max < size)
|
|
*max = size;
|
|
}
|
|
}
|
|
|
|
static void i2c_hid_free_buffers(struct i2c_hid *ihid)
|
|
{
|
|
kfree(ihid->inbuf);
|
|
kfree(ihid->rawbuf);
|
|
kfree(ihid->argsbuf);
|
|
kfree(ihid->cmdbuf);
|
|
ihid->inbuf = NULL;
|
|
ihid->rawbuf = NULL;
|
|
ihid->cmdbuf = NULL;
|
|
ihid->argsbuf = NULL;
|
|
ihid->bufsize = 0;
|
|
}
|
|
|
|
static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
|
|
{
|
|
/* the worst case is computed from the set_report command with a
|
|
* reportID > 15 and the maximum report length */
|
|
int args_len = sizeof(__u8) + /* ReportID */
|
|
sizeof(__u8) + /* optional ReportID byte */
|
|
sizeof(__u16) + /* data register */
|
|
sizeof(__u16) + /* size of the report */
|
|
report_size; /* report */
|
|
|
|
ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
|
|
ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
|
|
ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
|
|
ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
|
|
|
|
if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
|
|
i2c_hid_free_buffers(ihid);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ihid->bufsize = report_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_hid_get_raw_report(struct hid_device *hid,
|
|
unsigned char report_number, __u8 *buf, size_t count,
|
|
unsigned char report_type)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
size_t ret_count, ask_count;
|
|
int ret;
|
|
|
|
if (report_type == HID_OUTPUT_REPORT)
|
|
return -EINVAL;
|
|
|
|
/* +2 bytes to include the size of the reply in the query buffer */
|
|
ask_count = min(count + 2, (size_t)ihid->bufsize);
|
|
|
|
ret = i2c_hid_get_report(client,
|
|
report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
|
|
report_number, ihid->rawbuf, ask_count);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
|
|
|
|
if (ret_count <= 2)
|
|
return 0;
|
|
|
|
ret_count = min(ret_count, ask_count);
|
|
|
|
/* The query buffer contains the size, dropping it in the reply */
|
|
count = min(count, ret_count - 2);
|
|
memcpy(buf, ihid->rawbuf + 2, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
|
|
size_t count, unsigned char report_type, bool use_data)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
int report_id = buf[0];
|
|
int ret;
|
|
|
|
if (report_type == HID_INPUT_REPORT)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&ihid->reset_lock);
|
|
|
|
if (report_id) {
|
|
buf++;
|
|
count--;
|
|
}
|
|
|
|
ret = i2c_hid_set_or_send_report(client,
|
|
report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
|
|
report_id, buf, count, use_data);
|
|
|
|
if (report_id && ret >= 0)
|
|
ret++; /* add report_id to the number of transfered bytes */
|
|
|
|
mutex_unlock(&ihid->reset_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
|
|
size_t count)
|
|
{
|
|
return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
|
|
false);
|
|
}
|
|
|
|
static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
|
|
__u8 *buf, size_t len, unsigned char rtype,
|
|
int reqtype)
|
|
{
|
|
switch (reqtype) {
|
|
case HID_REQ_GET_REPORT:
|
|
return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
|
|
case HID_REQ_SET_REPORT:
|
|
if (buf[0] != reportnum)
|
|
return -EINVAL;
|
|
return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
static int i2c_hid_parse(struct hid_device *hid)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
struct i2c_hid_desc *hdesc = &ihid->hdesc;
|
|
unsigned int rsize;
|
|
char *rdesc;
|
|
int ret;
|
|
int tries = 3;
|
|
|
|
i2c_hid_dbg(ihid, "entering %s\n", __func__);
|
|
|
|
rsize = le16_to_cpu(hdesc->wReportDescLength);
|
|
if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
|
|
dbg_hid("weird size of report descriptor (%u)\n", rsize);
|
|
return -EINVAL;
|
|
}
|
|
|
|
do {
|
|
ret = i2c_hid_hwreset(client);
|
|
if (ret)
|
|
msleep(1000);
|
|
} while (tries-- > 0 && ret);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
rdesc = kzalloc(rsize, GFP_KERNEL);
|
|
|
|
if (!rdesc) {
|
|
dbg_hid("couldn't allocate rdesc memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
i2c_hid_dbg(ihid, "asking HID report descriptor\n");
|
|
|
|
ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
|
|
if (ret) {
|
|
hid_err(hid, "reading report descriptor failed\n");
|
|
kfree(rdesc);
|
|
return -EIO;
|
|
}
|
|
|
|
i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
|
|
|
|
ret = hid_parse_report(hid, rdesc, rsize);
|
|
kfree(rdesc);
|
|
if (ret) {
|
|
dbg_hid("parsing report descriptor failed\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_hid_start(struct hid_device *hid)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
int ret;
|
|
unsigned int bufsize = HID_MIN_BUFFER_SIZE;
|
|
|
|
i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
|
|
i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
|
|
i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
|
|
|
|
if (bufsize > ihid->bufsize) {
|
|
disable_irq(client->irq);
|
|
i2c_hid_free_buffers(ihid);
|
|
|
|
ret = i2c_hid_alloc_buffers(ihid, bufsize);
|
|
enable_irq(client->irq);
|
|
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void i2c_hid_stop(struct hid_device *hid)
|
|
{
|
|
hid->claimed = 0;
|
|
}
|
|
|
|
static int i2c_hid_open(struct hid_device *hid)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
int ret = 0;
|
|
|
|
ret = pm_runtime_get_sync(&client->dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
set_bit(I2C_HID_STARTED, &ihid->flags);
|
|
return 0;
|
|
}
|
|
|
|
static void i2c_hid_close(struct hid_device *hid)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
|
|
clear_bit(I2C_HID_STARTED, &ihid->flags);
|
|
|
|
/* Save some power */
|
|
pm_runtime_put(&client->dev);
|
|
}
|
|
|
|
static int i2c_hid_power(struct hid_device *hid, int lvl)
|
|
{
|
|
struct i2c_client *client = hid->driver_data;
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
|
|
i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
|
|
|
|
switch (lvl) {
|
|
case PM_HINT_FULLON:
|
|
pm_runtime_get_sync(&client->dev);
|
|
break;
|
|
case PM_HINT_NORMAL:
|
|
pm_runtime_put(&client->dev);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct hid_ll_driver i2c_hid_ll_driver = {
|
|
.parse = i2c_hid_parse,
|
|
.start = i2c_hid_start,
|
|
.stop = i2c_hid_stop,
|
|
.open = i2c_hid_open,
|
|
.close = i2c_hid_close,
|
|
.power = i2c_hid_power,
|
|
.output_report = i2c_hid_output_report,
|
|
.raw_request = i2c_hid_raw_request,
|
|
};
|
|
EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
|
|
|
|
static int i2c_hid_init_irq(struct i2c_client *client)
|
|
{
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
unsigned long irqflags = 0;
|
|
int ret;
|
|
|
|
dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
|
|
|
|
if (!irq_get_trigger_type(client->irq))
|
|
irqflags = IRQF_TRIGGER_LOW;
|
|
|
|
ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
|
|
irqflags | IRQF_ONESHOT, client->name, ihid);
|
|
if (ret < 0) {
|
|
dev_warn(&client->dev,
|
|
"Could not register for %s interrupt, irq = %d,"
|
|
" ret = %d\n",
|
|
client->name, client->irq, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
|
|
{
|
|
struct i2c_client *client = ihid->client;
|
|
struct i2c_hid_desc *hdesc = &ihid->hdesc;
|
|
unsigned int dsize;
|
|
int ret;
|
|
|
|
/* i2c hid fetch using a fixed descriptor size (30 bytes) */
|
|
i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
|
|
ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
|
|
sizeof(struct i2c_hid_desc));
|
|
if (ret) {
|
|
dev_err(&client->dev, "hid_descr_cmd failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Validate the length of HID descriptor, the 4 first bytes:
|
|
* bytes 0-1 -> length
|
|
* bytes 2-3 -> bcdVersion (has to be 1.00) */
|
|
/* check bcdVersion == 1.0 */
|
|
if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
|
|
dev_err(&client->dev,
|
|
"unexpected HID descriptor bcdVersion (0x%04hx)\n",
|
|
le16_to_cpu(hdesc->bcdVersion));
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Descriptor length should be 30 bytes as per the specification */
|
|
dsize = le16_to_cpu(hdesc->wHIDDescLength);
|
|
if (dsize != sizeof(struct i2c_hid_desc)) {
|
|
dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
|
|
dsize);
|
|
return -ENODEV;
|
|
}
|
|
i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
|
|
/*
|
|
* The CHPN0001 ACPI device, which is used to describe the Chipone
|
|
* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
|
|
*/
|
|
{"CHPN0001", 0 },
|
|
{ },
|
|
};
|
|
|
|
static int i2c_hid_acpi_pdata(struct i2c_client *client,
|
|
struct i2c_hid_platform_data *pdata)
|
|
{
|
|
static guid_t i2c_hid_guid =
|
|
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
|
|
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
|
|
union acpi_object *obj;
|
|
struct acpi_device *adev;
|
|
acpi_handle handle;
|
|
|
|
handle = ACPI_HANDLE(&client->dev);
|
|
if (!handle || acpi_bus_get_device(handle, &adev)) {
|
|
dev_err(&client->dev, "Error could not get ACPI device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
|
|
return -ENODEV;
|
|
|
|
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
|
|
ACPI_TYPE_INTEGER);
|
|
if (!obj) {
|
|
dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pdata->hid_descriptor_address = obj->integer.value;
|
|
ACPI_FREE(obj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void i2c_hid_acpi_fix_up_power(struct device *dev)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (adev)
|
|
acpi_device_fix_up_power(adev);
|
|
}
|
|
|
|
static const struct acpi_device_id i2c_hid_acpi_match[] = {
|
|
{"ACPI0C50", 0 },
|
|
{"PNP0C50", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
|
|
#else
|
|
static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
|
|
struct i2c_hid_platform_data *pdata)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static int i2c_hid_of_probe(struct i2c_client *client,
|
|
struct i2c_hid_platform_data *pdata)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
|
|
if (ret) {
|
|
dev_err(&client->dev, "HID register address not provided\n");
|
|
return -ENODEV;
|
|
}
|
|
if (val >> 16) {
|
|
dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
|
|
val);
|
|
return -EINVAL;
|
|
}
|
|
pdata->hid_descriptor_address = val;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id i2c_hid_of_match[] = {
|
|
{ .compatible = "hid-over-i2c" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
|
|
#else
|
|
static inline int i2c_hid_of_probe(struct i2c_client *client,
|
|
struct i2c_hid_platform_data *pdata)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
static void i2c_hid_fwnode_probe(struct i2c_client *client,
|
|
struct i2c_hid_platform_data *pdata)
|
|
{
|
|
u32 val;
|
|
|
|
if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
|
|
&val))
|
|
pdata->post_power_delay_ms = val;
|
|
}
|
|
|
|
static int i2c_hid_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *dev_id)
|
|
{
|
|
int ret;
|
|
struct i2c_hid *ihid;
|
|
struct hid_device *hid;
|
|
__u16 hidRegister;
|
|
struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
|
|
|
|
dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
|
|
|
|
if (!client->irq) {
|
|
dev_err(&client->dev,
|
|
"HID over i2c has not been provided an Int IRQ\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (client->irq < 0) {
|
|
if (client->irq != -EPROBE_DEFER)
|
|
dev_err(&client->dev,
|
|
"HID over i2c doesn't have a valid IRQ\n");
|
|
return client->irq;
|
|
}
|
|
|
|
ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
|
|
if (!ihid)
|
|
return -ENOMEM;
|
|
|
|
if (client->dev.of_node) {
|
|
ret = i2c_hid_of_probe(client, &ihid->pdata);
|
|
if (ret)
|
|
goto err;
|
|
} else if (!platform_data) {
|
|
ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
|
|
if (ret)
|
|
goto err;
|
|
} else {
|
|
ihid->pdata = *platform_data;
|
|
}
|
|
|
|
/* Parse platform agnostic common properties from ACPI / device tree */
|
|
i2c_hid_fwnode_probe(client, &ihid->pdata);
|
|
|
|
ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");
|
|
if (IS_ERR(ihid->pdata.supply)) {
|
|
ret = PTR_ERR(ihid->pdata.supply);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&client->dev, "Failed to get regulator: %d\n",
|
|
ret);
|
|
goto err;
|
|
}
|
|
|
|
ret = regulator_enable(ihid->pdata.supply);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to enable regulator: %d\n",
|
|
ret);
|
|
goto err;
|
|
}
|
|
if (ihid->pdata.post_power_delay_ms)
|
|
msleep(ihid->pdata.post_power_delay_ms);
|
|
|
|
i2c_set_clientdata(client, ihid);
|
|
|
|
ihid->client = client;
|
|
|
|
hidRegister = ihid->pdata.hid_descriptor_address;
|
|
ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
|
|
|
|
init_waitqueue_head(&ihid->wait);
|
|
mutex_init(&ihid->reset_lock);
|
|
|
|
/* we need to allocate the command buffer without knowing the maximum
|
|
* size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
|
|
* real computation later. */
|
|
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
|
|
if (ret < 0)
|
|
goto err_regulator;
|
|
|
|
i2c_hid_acpi_fix_up_power(&client->dev);
|
|
|
|
pm_runtime_get_noresume(&client->dev);
|
|
pm_runtime_set_active(&client->dev);
|
|
pm_runtime_enable(&client->dev);
|
|
device_enable_async_suspend(&client->dev);
|
|
|
|
/* Make sure there is something at this address */
|
|
ret = i2c_smbus_read_byte(client);
|
|
if (ret < 0) {
|
|
dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
|
|
ret = -ENXIO;
|
|
goto err_pm;
|
|
}
|
|
|
|
ret = i2c_hid_fetch_hid_descriptor(ihid);
|
|
if (ret < 0)
|
|
goto err_pm;
|
|
|
|
ret = i2c_hid_init_irq(client);
|
|
if (ret < 0)
|
|
goto err_pm;
|
|
|
|
hid = hid_allocate_device();
|
|
if (IS_ERR(hid)) {
|
|
ret = PTR_ERR(hid);
|
|
goto err_irq;
|
|
}
|
|
|
|
ihid->hid = hid;
|
|
|
|
hid->driver_data = client;
|
|
hid->ll_driver = &i2c_hid_ll_driver;
|
|
hid->dev.parent = &client->dev;
|
|
hid->bus = BUS_I2C;
|
|
hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
|
|
hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
|
|
hid->product = le16_to_cpu(ihid->hdesc.wProductID);
|
|
|
|
snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
|
|
client->name, hid->vendor, hid->product);
|
|
strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
|
|
|
|
ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
|
|
|
|
ret = hid_add_device(hid);
|
|
if (ret) {
|
|
if (ret != -ENODEV)
|
|
hid_err(client, "can't add hid device: %d\n", ret);
|
|
goto err_mem_free;
|
|
}
|
|
|
|
pm_runtime_put(&client->dev);
|
|
return 0;
|
|
|
|
err_mem_free:
|
|
hid_destroy_device(hid);
|
|
|
|
err_irq:
|
|
free_irq(client->irq, ihid);
|
|
|
|
err_pm:
|
|
pm_runtime_put_noidle(&client->dev);
|
|
pm_runtime_disable(&client->dev);
|
|
|
|
err_regulator:
|
|
regulator_disable(ihid->pdata.supply);
|
|
|
|
err:
|
|
i2c_hid_free_buffers(ihid);
|
|
kfree(ihid);
|
|
return ret;
|
|
}
|
|
|
|
static int i2c_hid_remove(struct i2c_client *client)
|
|
{
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
struct hid_device *hid;
|
|
|
|
pm_runtime_get_sync(&client->dev);
|
|
pm_runtime_disable(&client->dev);
|
|
pm_runtime_set_suspended(&client->dev);
|
|
pm_runtime_put_noidle(&client->dev);
|
|
|
|
hid = ihid->hid;
|
|
hid_destroy_device(hid);
|
|
|
|
free_irq(client->irq, ihid);
|
|
|
|
if (ihid->bufsize)
|
|
i2c_hid_free_buffers(ihid);
|
|
|
|
regulator_disable(ihid->pdata.supply);
|
|
|
|
kfree(ihid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void i2c_hid_shutdown(struct i2c_client *client)
|
|
{
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
|
|
i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
|
|
free_irq(client->irq, ihid);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int i2c_hid_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
struct hid_device *hid = ihid->hid;
|
|
int ret;
|
|
int wake_status;
|
|
|
|
if (hid->driver && hid->driver->suspend) {
|
|
/*
|
|
* Wake up the device so that IO issues in
|
|
* HID driver's suspend code can succeed.
|
|
*/
|
|
ret = pm_runtime_resume(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = hid->driver->suspend(hid, PMSG_SUSPEND);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (!pm_runtime_suspended(dev)) {
|
|
/* Save some power */
|
|
i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
|
|
|
|
disable_irq(client->irq);
|
|
}
|
|
|
|
if (device_may_wakeup(&client->dev)) {
|
|
wake_status = enable_irq_wake(client->irq);
|
|
if (!wake_status)
|
|
ihid->irq_wake_enabled = true;
|
|
else
|
|
hid_warn(hid, "Failed to enable irq wake: %d\n",
|
|
wake_status);
|
|
} else {
|
|
ret = regulator_disable(ihid->pdata.supply);
|
|
if (ret < 0)
|
|
hid_warn(hid, "Failed to disable supply: %d\n", ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_hid_resume(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct i2c_hid *ihid = i2c_get_clientdata(client);
|
|
struct hid_device *hid = ihid->hid;
|
|
int wake_status;
|
|
|
|
if (!device_may_wakeup(&client->dev)) {
|
|
ret = regulator_enable(ihid->pdata.supply);
|
|
if (ret < 0)
|
|
hid_warn(hid, "Failed to enable supply: %d\n", ret);
|
|
if (ihid->pdata.post_power_delay_ms)
|
|
msleep(ihid->pdata.post_power_delay_ms);
|
|
} else if (ihid->irq_wake_enabled) {
|
|
wake_status = disable_irq_wake(client->irq);
|
|
if (!wake_status)
|
|
ihid->irq_wake_enabled = false;
|
|
else
|
|
hid_warn(hid, "Failed to disable irq wake: %d\n",
|
|
wake_status);
|
|
}
|
|
|
|
/* We'll resume to full power */
|
|
pm_runtime_disable(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
|
|
enable_irq(client->irq);
|
|
ret = i2c_hid_hwreset(client);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* RAYDIUM device (2386:3118) need to re-send report descr cmd
|
|
* after resume, after this it will be back normal.
|
|
* otherwise it issues too many incomplete reports.
|
|
*/
|
|
if (ihid->quirks & I2C_HID_QUIRK_RESEND_REPORT_DESCR) {
|
|
ret = i2c_hid_command(client, &hid_report_descr_cmd, NULL, 0);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (hid->driver && hid->driver->reset_resume) {
|
|
ret = hid->driver->reset_resume(hid);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM
|
|
static int i2c_hid_runtime_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
|
|
disable_irq(client->irq);
|
|
return 0;
|
|
}
|
|
|
|
static int i2c_hid_runtime_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
enable_irq(client->irq);
|
|
i2c_hid_set_power(client, I2C_HID_PWR_ON);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops i2c_hid_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
|
|
SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
|
|
NULL)
|
|
};
|
|
|
|
static const struct i2c_device_id i2c_hid_id_table[] = {
|
|
{ "hid", 0 },
|
|
{ "hid-over-i2c", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
|
|
|
|
|
|
static struct i2c_driver i2c_hid_driver = {
|
|
.driver = {
|
|
.name = "i2c_hid",
|
|
.pm = &i2c_hid_pm,
|
|
.acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
|
|
.of_match_table = of_match_ptr(i2c_hid_of_match),
|
|
},
|
|
|
|
.probe = i2c_hid_probe,
|
|
.remove = i2c_hid_remove,
|
|
.shutdown = i2c_hid_shutdown,
|
|
.id_table = i2c_hid_id_table,
|
|
};
|
|
|
|
module_i2c_driver(i2c_hid_driver);
|
|
|
|
MODULE_DESCRIPTION("HID over I2C core driver");
|
|
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|