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Input: atmel_mxt_ts - split config update a bit
Let's split config update code a bit so it is hopefully a bit easier to read. Also, the firmware update callback should be the entity releasing firmware blob, not lower layers. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
This commit is contained in:
Dmitry Torokhov
parent
6cd1ab0fb6
commit
efdbd7ae44
@ -1064,131 +1064,21 @@ static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
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return crc;
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}
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/*
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* mxt_update_cfg - download configuration to chip
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*
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* Atmel Raw Config File Format
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*
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* The first four lines of the raw config file contain:
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* 1) Version
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* 2) Chip ID Information (first 7 bytes of device memory)
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* 3) Chip Information Block 24-bit CRC Checksum
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* 4) Chip Configuration 24-bit CRC Checksum
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*
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* The rest of the file consists of one line per object instance:
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* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
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*
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* <TYPE> - 2-byte object type as hex
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* <INSTANCE> - 2-byte object instance number as hex
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* <SIZE> - 2-byte object size as hex
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* <CONTENTS> - array of <SIZE> 1-byte hex values
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*/
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static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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static int mxt_prepare_cfg_mem(struct mxt_data *data,
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const struct firmware *cfg,
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unsigned int data_pos,
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unsigned int cfg_start_ofs,
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u8 *config_mem,
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size_t config_mem_size)
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{
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struct device *dev = &data->client->dev;
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struct mxt_info cfg_info;
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struct mxt_object *object;
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int ret;
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unsigned int type, instance, size, byte_offset;
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int offset;
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int data_pos;
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int byte_offset;
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int ret;
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int i;
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int cfg_start_ofs;
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u32 info_crc, config_crc, calculated_crc;
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u8 *config_mem;
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size_t config_mem_size;
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unsigned int type, instance, size;
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u8 val;
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u16 reg;
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mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
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if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
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dev_err(dev, "Unrecognised config file\n");
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ret = -EINVAL;
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goto release;
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}
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data_pos = strlen(MXT_CFG_MAGIC);
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/* Load information block and check */
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for (i = 0; i < sizeof(struct mxt_info); i++) {
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ret = sscanf(cfg->data + data_pos, "%hhx%n",
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(unsigned char *)&cfg_info + i,
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&offset);
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if (ret != 1) {
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dev_err(dev, "Bad format\n");
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ret = -EINVAL;
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goto release;
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}
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data_pos += offset;
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}
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if (cfg_info.family_id != data->info.family_id) {
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dev_err(dev, "Family ID mismatch!\n");
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ret = -EINVAL;
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goto release;
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}
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if (cfg_info.variant_id != data->info.variant_id) {
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dev_err(dev, "Variant ID mismatch!\n");
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ret = -EINVAL;
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goto release;
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}
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/* Read CRCs */
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ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset);
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if (ret != 1) {
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dev_err(dev, "Bad format: failed to parse Info CRC\n");
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ret = -EINVAL;
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goto release;
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}
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data_pos += offset;
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ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset);
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if (ret != 1) {
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dev_err(dev, "Bad format: failed to parse Config CRC\n");
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ret = -EINVAL;
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goto release;
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}
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data_pos += offset;
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/*
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* The Info Block CRC is calculated over mxt_info and the object
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* table. If it does not match then we are trying to load the
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* configuration from a different chip or firmware version, so
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* the configuration CRC is invalid anyway.
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*/
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if (info_crc == data->info_crc) {
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if (config_crc == 0 || data->config_crc == 0) {
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dev_info(dev, "CRC zero, attempting to apply config\n");
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} else if (config_crc == data->config_crc) {
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dev_dbg(dev, "Config CRC 0x%06X: OK\n",
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data->config_crc);
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ret = 0;
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goto release;
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} else {
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dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
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data->config_crc, config_crc);
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}
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} else {
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dev_warn(dev,
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"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
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data->info_crc, info_crc);
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}
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/* Malloc memory to store configuration */
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cfg_start_ofs = MXT_OBJECT_START +
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data->info.object_num * sizeof(struct mxt_object) +
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MXT_INFO_CHECKSUM_SIZE;
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config_mem_size = data->mem_size - cfg_start_ofs;
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config_mem = kzalloc(config_mem_size, GFP_KERNEL);
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if (!config_mem) {
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dev_err(dev, "Failed to allocate memory\n");
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ret = -ENOMEM;
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goto release;
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}
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u8 val;
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while (data_pos < cfg->size) {
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/* Read type, instance, length */
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@ -1199,8 +1089,7 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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break;
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} else if (ret != 3) {
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dev_err(dev, "Bad format: failed to parse object\n");
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ret = -EINVAL;
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goto release_mem;
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return -EINVAL;
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}
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data_pos += offset;
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@ -1240,8 +1129,7 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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if (instance >= mxt_obj_instances(object)) {
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dev_err(dev, "Object instances exceeded!\n");
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ret = -EINVAL;
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goto release_mem;
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return -EINVAL;
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}
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reg = object->start_address + mxt_obj_size(object) * instance;
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@ -1252,8 +1140,7 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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&offset);
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if (ret != 1) {
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dev_err(dev, "Bad format in T%d\n", type);
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ret = -EINVAL;
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goto release_mem;
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return -EINVAL;
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}
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data_pos += offset;
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@ -1262,18 +1149,166 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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byte_offset = reg + i - cfg_start_ofs;
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if ((byte_offset >= 0)
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&& (byte_offset <= config_mem_size)) {
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if (byte_offset >= 0 &&
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byte_offset <= config_mem_size) {
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*(config_mem + byte_offset) = val;
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} else {
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dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
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reg, object->type, byte_offset);
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ret = -EINVAL;
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goto release_mem;
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return -EINVAL;
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}
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}
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}
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return 0;
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}
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static int mxt_upload_cfg_mem(struct mxt_data *data, unsigned int cfg_start,
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u8 *config_mem, size_t config_mem_size)
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{
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unsigned int byte_offset = 0;
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int error;
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/* Write configuration as blocks */
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while (byte_offset < config_mem_size) {
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unsigned int size = config_mem_size - byte_offset;
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if (size > MXT_MAX_BLOCK_WRITE)
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size = MXT_MAX_BLOCK_WRITE;
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error = __mxt_write_reg(data->client,
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cfg_start + byte_offset,
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size, config_mem + byte_offset);
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if (error) {
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dev_err(&data->client->dev,
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"Config write error, ret=%d\n", error);
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return error;
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}
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byte_offset += size;
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}
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return 0;
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}
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/*
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* mxt_update_cfg - download configuration to chip
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*
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* Atmel Raw Config File Format
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*
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* The first four lines of the raw config file contain:
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* 1) Version
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* 2) Chip ID Information (first 7 bytes of device memory)
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* 3) Chip Information Block 24-bit CRC Checksum
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* 4) Chip Configuration 24-bit CRC Checksum
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*
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* The rest of the file consists of one line per object instance:
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* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
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*
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* <TYPE> - 2-byte object type as hex
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* <INSTANCE> - 2-byte object instance number as hex
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* <SIZE> - 2-byte object size as hex
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* <CONTENTS> - array of <SIZE> 1-byte hex values
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*/
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static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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{
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struct device *dev = &data->client->dev;
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struct mxt_info cfg_info;
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int ret;
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int offset;
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int data_pos;
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int i;
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int cfg_start_ofs;
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u32 info_crc, config_crc, calculated_crc;
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u8 *config_mem;
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size_t config_mem_size;
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mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
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if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
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dev_err(dev, "Unrecognised config file\n");
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return -EINVAL;
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}
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data_pos = strlen(MXT_CFG_MAGIC);
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/* Load information block and check */
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for (i = 0; i < sizeof(struct mxt_info); i++) {
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ret = sscanf(cfg->data + data_pos, "%hhx%n",
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(unsigned char *)&cfg_info + i,
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&offset);
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if (ret != 1) {
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dev_err(dev, "Bad format\n");
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return -EINVAL;
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}
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data_pos += offset;
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}
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if (cfg_info.family_id != data->info.family_id) {
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dev_err(dev, "Family ID mismatch!\n");
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return -EINVAL;
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}
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if (cfg_info.variant_id != data->info.variant_id) {
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dev_err(dev, "Variant ID mismatch!\n");
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return -EINVAL;
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}
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/* Read CRCs */
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ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset);
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if (ret != 1) {
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dev_err(dev, "Bad format: failed to parse Info CRC\n");
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return -EINVAL;
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}
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data_pos += offset;
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ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset);
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if (ret != 1) {
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dev_err(dev, "Bad format: failed to parse Config CRC\n");
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return -EINVAL;
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}
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data_pos += offset;
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/*
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* The Info Block CRC is calculated over mxt_info and the object
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* table. If it does not match then we are trying to load the
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* configuration from a different chip or firmware version, so
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* the configuration CRC is invalid anyway.
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*/
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if (info_crc == data->info_crc) {
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if (config_crc == 0 || data->config_crc == 0) {
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dev_info(dev, "CRC zero, attempting to apply config\n");
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} else if (config_crc == data->config_crc) {
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dev_dbg(dev, "Config CRC 0x%06X: OK\n",
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data->config_crc);
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return 0;
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} else {
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dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
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data->config_crc, config_crc);
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}
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} else {
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dev_warn(dev,
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"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
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data->info_crc, info_crc);
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}
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/* Malloc memory to store configuration */
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cfg_start_ofs = MXT_OBJECT_START +
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data->info.object_num * sizeof(struct mxt_object) +
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MXT_INFO_CHECKSUM_SIZE;
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config_mem_size = data->mem_size - cfg_start_ofs;
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config_mem = kzalloc(config_mem_size, GFP_KERNEL);
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if (!config_mem) {
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dev_err(dev, "Failed to allocate memory\n");
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return -ENOMEM;
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}
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ret = mxt_prepare_cfg_mem(data, cfg, data_pos, cfg_start_ofs,
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config_mem, config_mem_size);
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if (ret)
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goto release_mem;
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/* Calculate crc of the received configs (not the raw config file) */
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if (data->T7_address < cfg_start_ofs) {
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dev_err(dev, "Bad T7 address, T7addr = %x, config offset %x\n",
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@ -1286,28 +1321,14 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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data->T7_address - cfg_start_ofs,
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config_mem_size);
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if (config_crc > 0 && (config_crc != calculated_crc))
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if (config_crc > 0 && config_crc != calculated_crc)
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dev_warn(dev, "Config CRC error, calculated=%06X, file=%06X\n",
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calculated_crc, config_crc);
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/* Write configuration as blocks */
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byte_offset = 0;
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while (byte_offset < config_mem_size) {
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size = config_mem_size - byte_offset;
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if (size > MXT_MAX_BLOCK_WRITE)
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size = MXT_MAX_BLOCK_WRITE;
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ret = __mxt_write_reg(data->client,
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cfg_start_ofs + byte_offset,
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size, config_mem + byte_offset);
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if (ret != 0) {
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dev_err(dev, "Config write error, ret=%d\n", ret);
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goto release_mem;
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}
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byte_offset += size;
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}
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ret = mxt_upload_cfg_mem(data, cfg_start_ofs,
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config_mem, config_mem_size);
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if (ret)
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goto release_mem;
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mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
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@ -1319,8 +1340,6 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
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release_mem:
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kfree(config_mem);
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release:
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release_firmware(cfg);
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return ret;
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}
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@ -1640,6 +1659,7 @@ static int mxt_configure_objects(struct mxt_data *data,
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static void mxt_config_cb(const struct firmware *cfg, void *ctx)
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{
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mxt_configure_objects(ctx, cfg);
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release_firmware(cfg);
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}
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static int mxt_initialize(struct mxt_data *data)
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