Input: cyapa - add support for smbus protocol (6ddaf744) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/input/mouse/cyapa.c

+174 −5

Original line number	Diff line number	Diff line
		@@ -208,6 +208,7 @@ struct cyapa {
		char phys[32]; /* device physical location */
		int irq;
		bool irq_wake; /* irq wake is enabled */
		bool smbus;

		/* read from query data region. */
		char product_id[16];
		@@ -229,6 +230,60 @@ struct cyapa_cmd_len {
		u8 len;
		};

		#define CYAPA_ADAPTER_FUNC_NONE 0
		#define CYAPA_ADAPTER_FUNC_I2C 1
		#define CYAPA_ADAPTER_FUNC_SMBUS 2
		#define CYAPA_ADAPTER_FUNC_BOTH 3

		/*
		* macros for SMBus communication
		*/
		#define SMBUS_READ 0x01
		#define SMBUS_WRITE 0x00
		#define SMBUS_ENCODE_IDX(cmd, idx) ((cmd) \| (((idx) & 0x03) << 1))
		#define SMBUS_ENCODE_RW(cmd, rw) ((cmd) \| ((rw) & 0x01))
		#define SMBUS_BYTE_BLOCK_CMD_MASK 0x80
		#define SMBUS_GROUP_BLOCK_CMD_MASK 0x40

		/* for byte read/write command */
		#define CMD_RESET 0
		#define CMD_POWER_MODE 1
		#define CMD_DEV_STATUS 2
		#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
		#define CYAPA_SMBUS_RESET SMBUS_BYTE_CMD(CMD_RESET)
		#define CYAPA_SMBUS_POWER_MODE SMBUS_BYTE_CMD(CMD_POWER_MODE)
		#define CYAPA_SMBUS_DEV_STATUS SMBUS_BYTE_CMD(CMD_DEV_STATUS)

		/* for group registers read/write command */
		#define REG_GROUP_DATA 0
		#define REG_GROUP_CMD 2
		#define REG_GROUP_QUERY 3
		#define SMBUS_GROUP_CMD(grp) (0x80 \| (((grp) & 0x07) << 3))
		#define CYAPA_SMBUS_GROUP_DATA SMBUS_GROUP_CMD(REG_GROUP_DATA)
		#define CYAPA_SMBUS_GROUP_CMD SMBUS_GROUP_CMD(REG_GROUP_CMD)
		#define CYAPA_SMBUS_GROUP_QUERY SMBUS_GROUP_CMD(REG_GROUP_QUERY)

		/* for register block read/write command */
		#define CMD_BL_STATUS 0
		#define CMD_BL_HEAD 1
		#define CMD_BL_CMD 2
		#define CMD_BL_DATA 3
		#define CMD_BL_ALL 4
		#define CMD_BLK_PRODUCT_ID 5
		#define CMD_BLK_HEAD 6
		#define SMBUS_BLOCK_CMD(cmd) (0xc0 \| (((cmd) & 0x1f) << 1))

		/* register block read/write command in bootloader mode */
		#define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
		#define CYAPA_SMBUS_BL_HEAD SMBUS_BLOCK_CMD(CMD_BL_HEAD)
		#define CYAPA_SMBUS_BL_CMD SMBUS_BLOCK_CMD(CMD_BL_CMD)
		#define CYAPA_SMBUS_BL_DATA SMBUS_BLOCK_CMD(CMD_BL_DATA)
		#define CYAPA_SMBUS_BL_ALL SMBUS_BLOCK_CMD(CMD_BL_ALL)

		/* register block read/write command in operational mode */
		#define CYAPA_SMBUS_BLK_PRODUCT_ID SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
		#define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)

		static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
		{ CYAPA_OFFSET_SOFT_RESET, 1 },
		{ REG_OFFSET_COMMAND_BASE + 1, 1 },
		@@ -245,6 +300,22 @@ static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
		{ REG_OFFSET_DATA_BASE, 32 }
		};

		static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
		{ CYAPA_SMBUS_RESET, 1 },
		{ CYAPA_SMBUS_POWER_MODE, 1 },
		{ CYAPA_SMBUS_DEV_STATUS, 1 },
		{ CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
		{ CYAPA_SMBUS_GROUP_CMD, 2 },
		{ CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
		{ CYAPA_SMBUS_BL_STATUS, 3 },
		{ CYAPA_SMBUS_BL_HEAD, 16 },
		{ CYAPA_SMBUS_BL_CMD, 16 },
		{ CYAPA_SMBUS_BL_DATA, 16 },
		{ CYAPA_SMBUS_BL_ALL, 32 },
		{ CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
		{ CYAPA_SMBUS_BLK_HEAD, 16 },
		};

		static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
		u8 *values)
		{
		@@ -257,27 +328,93 @@ static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
		return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
		}

		/*
		* cyapa_smbus_read_block - perform smbus block read command
		* @cyapa - private data structure of the driver
		* @cmd - the properly encoded smbus command
		* @len - expected length of smbus command result
		* @values - buffer to store smbus command result
		*
		* Returns negative errno, else the number of bytes written.
		*
		* Note:
		* In trackpad device, the memory block allocated for I2C register map
		* is 256 bytes, so the max read block for I2C bus is 256 bytes.
		*/
		static ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
		u8 *values)
		{
		ssize_t ret;
		u8 index;
		u8 smbus_cmd;
		u8 *buf;
		struct i2c_client *client = cyapa->client;

		if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
		return -EINVAL;

		if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
		/* read specific block registers command. */
		smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
		ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
		goto out;
		}

		ret = 0;
		for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
		smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
		smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
		buf = values + I2C_SMBUS_BLOCK_MAX * index;
		ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
		if (ret < 0)
		goto out;
		}

		out:
		return ret > 0 ? len : ret;
		}

		static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
		{
		u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		u8 cmd;

		if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
		} else {
		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		}
		return i2c_smbus_read_byte_data(cyapa->client, cmd);
		}

		static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
		{
		u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		u8 cmd;

		if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
		} else {
		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		}
		return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
		}

		static ssize_t cyapa_read_block(struct cyapa cyapa, u8 cmd_idx, u8 values)
		{
		u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		size_t len = cyapa_i2c_cmds[cmd_idx].len;
		u8 cmd;
		size_t len;

		if (cyapa->smbus) {
		cmd = cyapa_smbus_cmds[cmd_idx].cmd;
		len = cyapa_smbus_cmds[cmd_idx].len;
		return cyapa_smbus_read_block(cyapa, cmd, len, values);
		} else {
		cmd = cyapa_i2c_cmds[cmd_idx].cmd;
		len = cyapa_i2c_cmds[cmd_idx].len;
		return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
		}
		}

		/*
		* Query device for its current operating state.
		@@ -298,6 +435,15 @@ static int cyapa_get_state(struct cyapa *cyapa)
		*/
		ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
		status);

		/*
		* On smbus systems in OP mode, the i2c_reg_read will fail with
		* -ETIMEDOUT. In this case, try again using the smbus equivalent
		* command. This should return a BL_HEAD indicating CYAPA_STATE_OP.
		*/
		if (cyapa->smbus && (ret == -ETIMEDOUT \|\| ret == -ENXIO))
		ret = cyapa_read_block(cyapa, CYAPA_CMD_BL_STATUS, status);

		if (ret != BL_STATUS_SIZE)
		goto error;

		@@ -594,6 +740,19 @@ out:
		return IRQ_HANDLED;
		}

		static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
		{
		u8 ret = CYAPA_ADAPTER_FUNC_NONE;

		if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
		ret \|= CYAPA_ADAPTER_FUNC_I2C;
		if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
		I2C_FUNC_SMBUS_BLOCK_DATA \|
		I2C_FUNC_SMBUS_I2C_BLOCK))
		ret \|= CYAPA_ADAPTER_FUNC_SMBUS;
		return ret;
		}

		static int cyapa_create_input_dev(struct cyapa *cyapa)
		{
		struct device *dev = &cyapa->client->dev;
		@@ -668,9 +827,16 @@ static int cyapa_probe(struct i2c_client *client,
		const struct i2c_device_id *dev_id)
		{
		int ret;
		u8 adapter_func;
		struct cyapa *cyapa;
		struct device *dev = &client->dev;

		adapter_func = cyapa_check_adapter_functionality(client);
		if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
		dev_err(dev, "not a supported I2C/SMBus adapter\n");
		return -EIO;
		}

		cyapa = kzalloc(sizeof(struct cyapa), GFP_KERNEL);
		if (!cyapa) {
		dev_err(dev, "allocate memory for cyapa failed\n");
		@@ -683,6 +849,9 @@ static int cyapa_probe(struct i2c_client *client,
		sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
		client->addr);

		/* i2c isn't supported, use smbus */
		if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
		cyapa->smbus = true;
		cyapa->state = CYAPA_STATE_NO_DEVICE;
		ret = cyapa_check_is_operational(cyapa);
		if (ret) {