Input: cyapa - add gen3 trackpad device firmware update support
Add support for firmware image update for gen3 trackpad devices; the firmware update is initiated by writing to update_fw sysfs attribute. Signed-off-by: Dudley Du <dudl@cypress.com> Tested-by: Jeremiah Mahler <jmmahler@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dudley Du
Dmitry Torokhov
Родитель
c806b0b84d
Коммит
87b26d7288
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@ -20,6 +20,7 @@
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#include <linux/input/mt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/unaligned/access_ok.h>
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#include "cyapa.h"
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@ -115,6 +116,18 @@ struct cyapa_reg_data {
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struct cyapa_touch touches[5];
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} __packed;
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struct gen3_write_block_cmd {
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u8 checksum_seed; /* Always be 0xff */
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u8 cmd_code; /* command code: 0x39 */
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u8 key[8]; /* 8-byte security key */
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__be16 block_num;
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u8 block_data[CYAPA_FW_BLOCK_SIZE];
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u8 block_checksum; /* Calculated using bytes 12 - 75 */
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u8 cmd_checksum; /* Calculated using bytes 0-76 */
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} __packed;
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static const u8 security_key[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
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static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02, 0x03,
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0x04, 0x05, 0x06, 0x07 };
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static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
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@ -423,6 +436,87 @@ static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
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return -EAGAIN;
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}
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/*
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* Enter bootloader by soft resetting the device.
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*
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* If device is already in the bootloader, the function just returns.
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* Otherwise, reset the device; after reset, device enters bootloader idle
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* state immediately.
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*
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* Returns:
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* 0 on success
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* -EAGAIN device was reset, but is not now in bootloader idle state
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* < 0 if the device never responds within the timeout
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*/
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static int cyapa_gen3_bl_enter(struct cyapa *cyapa)
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{
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int error;
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int waiting_time;
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error = cyapa_poll_state(cyapa, 500);
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if (error)
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return error;
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if (cyapa->state == CYAPA_STATE_BL_IDLE) {
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/* Already in BL_IDLE. Skipping reset. */
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return 0;
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}
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if (cyapa->state != CYAPA_STATE_OP)
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return -EAGAIN;
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cyapa->operational = false;
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cyapa->state = CYAPA_STATE_NO_DEVICE;
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error = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, 0x01);
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if (error)
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return -EIO;
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usleep_range(25000, 50000);
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waiting_time = 2000; /* For some shipset, max waiting time is 1~2s. */
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do {
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error = cyapa_poll_state(cyapa, 500);
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if (error) {
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if (error == -ETIMEDOUT) {
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waiting_time -= 500;
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continue;
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}
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return error;
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}
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if ((cyapa->state == CYAPA_STATE_BL_IDLE) &&
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!(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
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break;
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msleep(100);
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waiting_time -= 100;
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} while (waiting_time > 0);
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if ((cyapa->state != CYAPA_STATE_BL_IDLE) ||
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(cyapa->status[REG_BL_STATUS] & BL_STATUS_WATCHDOG))
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return -EAGAIN;
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return 0;
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}
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static int cyapa_gen3_bl_activate(struct cyapa *cyapa)
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{
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int error;
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error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_activate),
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bl_activate);
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if (error)
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return error;
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/* Wait for bootloader to activate; takes between 2 and 12 seconds */
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msleep(2000);
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error = cyapa_poll_state(cyapa, 11000);
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if (error)
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return error;
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if (cyapa->state != CYAPA_STATE_BL_ACTIVE)
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return -EAGAIN;
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return 0;
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}
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static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
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{
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int error;
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@ -483,6 +577,212 @@ static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
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return 0;
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}
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static u16 cyapa_gen3_csum(const u8 *buf, size_t count)
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{
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int i;
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u16 csum = 0;
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for (i = 0; i < count; i++)
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csum += buf[i];
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return csum;
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}
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/*
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* Verify the integrity of a CYAPA firmware image file.
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*
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* The firmware image file is 30848 bytes, composed of 482 64-byte blocks.
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*
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* The first 2 blocks are the firmware header.
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* The next 480 blocks are the firmware image.
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*
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* The first two bytes of the header hold the header checksum, computed by
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* summing the other 126 bytes of the header.
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* The last two bytes of the header hold the firmware image checksum, computed
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* by summing the 30720 bytes of the image modulo 0xffff.
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*
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* Both checksums are stored little-endian.
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*/
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static int cyapa_gen3_check_fw(struct cyapa *cyapa, const struct firmware *fw)
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{
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struct device *dev = &cyapa->client->dev;
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u16 csum;
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u16 csum_expected;
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/* Firmware must match exact 30848 bytes = 482 64-byte blocks. */
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if (fw->size != CYAPA_FW_SIZE) {
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dev_err(dev, "invalid firmware size = %zu, expected %u.\n",
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fw->size, CYAPA_FW_SIZE);
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return -EINVAL;
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}
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/* Verify header block */
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csum_expected = (fw->data[0] << 8) | fw->data[1];
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csum = cyapa_gen3_csum(&fw->data[2], CYAPA_FW_HDR_SIZE - 2);
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if (csum != csum_expected) {
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dev_err(dev, "%s %04x, expected: %04x\n",
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"invalid firmware header checksum = ",
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csum, csum_expected);
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return -EINVAL;
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}
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/* Verify firmware image */
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csum_expected = (fw->data[CYAPA_FW_HDR_SIZE - 2] << 8) |
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fw->data[CYAPA_FW_HDR_SIZE - 1];
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csum = cyapa_gen3_csum(&fw->data[CYAPA_FW_HDR_SIZE],
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CYAPA_FW_DATA_SIZE);
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if (csum != csum_expected) {
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dev_err(dev, "%s %04x, expected: %04x\n",
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"invalid firmware header checksum = ",
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csum, csum_expected);
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Write a |len| byte long buffer |buf| to the device, by chopping it up into a
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* sequence of smaller |CYAPA_CMD_LEN|-length write commands.
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*
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* The data bytes for a write command are prepended with the 1-byte offset
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* of the data relative to the start of |buf|.
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*/
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static int cyapa_gen3_write_buffer(struct cyapa *cyapa,
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const u8 *buf, size_t len)
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{
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int error;
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size_t i;
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unsigned char cmd[CYAPA_CMD_LEN + 1];
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size_t cmd_len;
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for (i = 0; i < len; i += CYAPA_CMD_LEN) {
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const u8 *payload = &buf[i];
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cmd_len = (len - i >= CYAPA_CMD_LEN) ? CYAPA_CMD_LEN : len - i;
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cmd[0] = i;
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memcpy(&cmd[1], payload, cmd_len);
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error = cyapa_i2c_reg_write_block(cyapa, 0, cmd_len + 1, cmd);
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if (error)
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return error;
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}
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return 0;
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}
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/*
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* A firmware block write command writes 64 bytes of data to a single flash
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* page in the device. The 78-byte block write command has the format:
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* <0xff> <CMD> <Key> <Start> <Data> <Data-Checksum> <CMD Checksum>
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*
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* <0xff> - every command starts with 0xff
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* <CMD> - the write command value is 0x39
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* <Key> - write commands include an 8-byte key: { 00 01 02 03 04 05 06 07 }
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* <Block> - Memory Block number (address / 64) (16-bit, big-endian)
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* <Data> - 64 bytes of firmware image data
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* <Data Checksum> - sum of 64 <Data> bytes, modulo 0xff
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* <CMD Checksum> - sum of 77 bytes, from 0xff to <Data Checksum>
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*
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* Each write command is split into 5 i2c write transactions of up to 16 bytes.
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* Each transaction starts with an i2c register offset: (00, 10, 20, 30, 40).
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*/
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static int cyapa_gen3_write_fw_block(struct cyapa *cyapa,
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u16 block, const u8 *data)
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{
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int ret;
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struct gen3_write_block_cmd write_block_cmd;
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u8 status[BL_STATUS_SIZE];
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int tries;
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u8 bl_status, bl_error;
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/* Set write command and security key bytes. */
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write_block_cmd.checksum_seed = GEN3_BL_CMD_CHECKSUM_SEED;
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write_block_cmd.cmd_code = GEN3_BL_CMD_WRITE_BLOCK;
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memcpy(write_block_cmd.key, security_key, sizeof(security_key));
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put_unaligned_be16(block, &write_block_cmd.block_num);
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memcpy(write_block_cmd.block_data, data, CYAPA_FW_BLOCK_SIZE);
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write_block_cmd.block_checksum = cyapa_gen3_csum(
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write_block_cmd.block_data, CYAPA_FW_BLOCK_SIZE);
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write_block_cmd.cmd_checksum = cyapa_gen3_csum((u8 *)&write_block_cmd,
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sizeof(write_block_cmd) - 1);
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ret = cyapa_gen3_write_buffer(cyapa, (u8 *)&write_block_cmd,
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sizeof(write_block_cmd));
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if (ret)
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return ret;
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/* Wait for write to finish */
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tries = 11; /* Programming for one block can take about 100ms. */
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do {
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usleep_range(10000, 20000);
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/* Check block write command result status. */
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ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET,
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BL_STATUS_SIZE, status);
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if (ret != BL_STATUS_SIZE)
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return (ret < 0) ? ret : -EIO;
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} while ((status[REG_BL_STATUS] & BL_STATUS_BUSY) && --tries);
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/* Ignore WATCHDOG bit and reserved bits. */
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bl_status = status[REG_BL_STATUS] & ~BL_STATUS_REV_MASK;
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bl_error = status[REG_BL_ERROR] & ~BL_ERROR_RESERVED;
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if (bl_status & BL_STATUS_BUSY)
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ret = -ETIMEDOUT;
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else if (bl_status != BL_STATUS_RUNNING ||
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bl_error != BL_ERROR_BOOTLOADING)
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ret = -EIO;
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else
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ret = 0;
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return ret;
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}
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static int cyapa_gen3_write_blocks(struct cyapa *cyapa,
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size_t start_block, size_t block_count,
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const u8 *image_data)
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{
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int error;
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int i;
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for (i = 0; i < block_count; i++) {
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size_t block = start_block + i;
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size_t addr = i * CYAPA_FW_BLOCK_SIZE;
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const u8 *data = &image_data[addr];
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error = cyapa_gen3_write_fw_block(cyapa, block, data);
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if (error)
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return error;
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}
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return 0;
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}
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static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
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const struct firmware *fw)
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{
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struct device *dev = &cyapa->client->dev;
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int error;
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/* First write data, starting at byte 128 of fw->data */
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error = cyapa_gen3_write_blocks(cyapa,
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CYAPA_FW_DATA_BLOCK_START, CYAPA_FW_DATA_BLOCK_COUNT,
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&fw->data[CYAPA_FW_HDR_BLOCK_COUNT * CYAPA_FW_BLOCK_SIZE]);
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if (error) {
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dev_err(dev, "FW update aborted, write image: %d\n", error);
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return error;
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}
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/* Then write checksum */
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error = cyapa_gen3_write_blocks(cyapa,
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CYAPA_FW_HDR_BLOCK_START, CYAPA_FW_HDR_BLOCK_COUNT,
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&fw->data[0]);
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if (error) {
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dev_err(dev, "FW update aborted, write checksum: %d\n", error);
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return error;
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}
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return 0;
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}
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/*
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* cyapa_get_wait_time_for_pwr_cmd
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*
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@ -791,10 +1091,19 @@ static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
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}
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static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; }
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static int cyapa_gen3_bl_initiate(struct cyapa *cyapa,
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const struct firmware *fw) { return 0; }
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static int cyapa_gen3_empty_output_data(struct cyapa *cyapa,
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u8 *buf, int *len, cb_sort func) { return 0; }
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const struct cyapa_dev_ops cyapa_gen3_ops = {
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.check_fw = cyapa_gen3_check_fw,
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.bl_enter = cyapa_gen3_bl_enter,
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.bl_activate = cyapa_gen3_bl_activate,
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.update_fw = cyapa_gen3_do_fw_update,
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.bl_deactivate = cyapa_gen3_bl_deactivate,
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.bl_initiate = cyapa_gen3_bl_initiate,
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.initialize = cyapa_gen3_initialize,
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.state_parse = cyapa_gen3_state_parse,
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