diff options
| -rw-r--r-- | drivers/input/touchscreen/goodix.c | 244 |
1 files changed, 212 insertions, 32 deletions
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index 6ad379a..cd92d8f 100644 --- a/drivers/input/touchscreen/goodix.c +++ b/drivers/input/touchscreen/goodix.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/dmi.h> +#include <linux/firmware.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/input.h> @@ -40,6 +41,10 @@ struct goodix_ts_data { int cfg_len; struct gpio_desc *gpiod_int; struct gpio_desc *gpiod_rst; + u16 id; + u16 version; + const char *cfg_name; + struct completion firmware_loading_complete; }; #define GOODIX_GPIO_INT_NAME "irq" @@ -124,6 +129,39 @@ static int goodix_i2c_read(struct i2c_client *client, return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0); } +/** + * goodix_i2c_write - write data to a register of the i2c slave device. + * + * @client: i2c device. + * @reg: the register to write to. + * @buf: raw data buffer to write. + * @len: length of the buffer to write + */ +static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, + unsigned len) +{ + u8 *addr_buf; + struct i2c_msg msg; + int ret; + + addr_buf = kmalloc(len + 2, GFP_KERNEL); + if (!addr_buf) + return -ENOMEM; + + addr_buf[0] = reg >> 8; + addr_buf[1] = reg & 0xFF; + memcpy(&addr_buf[2], buf, len); + + msg.flags = 0; + msg.addr = client->addr; + msg.buf = addr_buf; + msg.len = len + 2; + + ret = i2c_transfer(client->adapter, &msg, 1); + kfree(addr_buf); + return ret < 0 ? ret : (ret != 1 ? -EIO : 0); +} + static int goodix_get_cfg_len(u16 id) { switch (id) { @@ -245,6 +283,73 @@ static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +/** + * goodix_check_cfg - Checks if config fw is valid + * + * @ts: goodix_ts_data pointer + * @cfg: firmware config data + */ +static int goodix_check_cfg(struct goodix_ts_data *ts, + const struct firmware *cfg) +{ + int i, raw_cfg_len; + u8 check_sum = 0; + + if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) { + dev_err(&ts->client->dev, + "The length of the config fw is not correct"); + return -EINVAL; + } + + raw_cfg_len = cfg->size - 2; + for (i = 0; i < raw_cfg_len; i++) + check_sum += cfg->data[i]; + check_sum = (~check_sum) + 1; + if (check_sum != cfg->data[raw_cfg_len]) { + dev_err(&ts->client->dev, + "The checksum of the config fw is not correct"); + return -EINVAL; + } + + if (cfg->data[raw_cfg_len + 1] != 1) { + dev_err(&ts->client->dev, + "Config fw must have Config_Fresh register set"); + return -EINVAL; + } + + return 0; +} + +/** + * goodix_send_cfg - Write fw config to device + * + * @ts: goodix_ts_data pointer + * @cfg: config firmware to write to device + */ +static int goodix_send_cfg(struct goodix_ts_data *ts, + const struct firmware *cfg) +{ + int error; + + error = goodix_check_cfg(ts, cfg); + if (error) + return error; + + error = goodix_i2c_write(ts->client, GOODIX_REG_CONFIG_DATA, cfg->data, + cfg->size); + if (error) { + dev_err(&ts->client->dev, "Failed to write config data: %d", + error); + return error; + } + dev_dbg(&ts->client->dev, "Config sent successfully."); + + /* Let the firmware reconfigure itself, so sleep for 10ms */ + usleep_range(10000, 11000); + + return 0; +} + static int goodix_int_sync(struct goodix_ts_data *ts) { int error; @@ -391,30 +496,29 @@ static void goodix_read_config(struct goodix_ts_data *ts) /** * goodix_read_version - Read goodix touchscreen version * - * @client: the i2c client - * @version: output buffer containing the version on success - * @id: output buffer containing the id on success + * @ts: our goodix_ts_data pointer */ -static int goodix_read_version(struct i2c_client *client, u16 *version, u16 *id) +static int goodix_read_version(struct goodix_ts_data *ts) { int error; u8 buf[6]; char id_str[5]; - error = goodix_i2c_read(client, GOODIX_REG_ID, buf, sizeof(buf)); + error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf)); if (error) { - dev_err(&client->dev, "read version failed: %d\n", error); + dev_err(&ts->client->dev, "read version failed: %d\n", error); return error; } memcpy(id_str, buf, 4); id_str[4] = 0; - if (kstrtou16(id_str, 10, id)) - *id = 0x1001; + if (kstrtou16(id_str, 10, &ts->id)) + ts->id = 0x1001; - *version = get_unaligned_le16(&buf[4]); + ts->version = get_unaligned_le16(&buf[4]); - dev_info(&client->dev, "ID %d, version: %04x\n", *id, *version); + dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id, + ts->version); return 0; } @@ -448,13 +552,10 @@ static int goodix_i2c_test(struct i2c_client *client) * goodix_request_input_dev - Allocate, populate and register the input device * * @ts: our goodix_ts_data pointer - * @version: device firmware version - * @id: device ID * * Must be called during probe */ -static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version, - u16 id) +static int goodix_request_input_dev(struct goodix_ts_data *ts) { int error; @@ -478,8 +579,8 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version, ts->input_dev->phys = "input/ts"; ts->input_dev->id.bustype = BUS_I2C; ts->input_dev->id.vendor = 0x0416; - ts->input_dev->id.product = id; - ts->input_dev->id.version = version; + ts->input_dev->id.product = ts->id; + ts->input_dev->id.version = ts->version; error = input_register_device(ts->input_dev); if (error) { @@ -491,13 +592,71 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version, return 0; } +/** + * goodix_configure_dev - Finish device initialization + * + * @ts: our goodix_ts_data pointer + * + * Must be called from probe to finish initialization of the device. + * Contains the common initialization code for both devices that + * declare gpio pins and devices that do not. It is either called + * directly from probe or from request_firmware_wait callback. + */ +static int goodix_configure_dev(struct goodix_ts_data *ts) +{ + int error; + unsigned long irq_flags; + + goodix_read_config(ts); + + error = goodix_request_input_dev(ts); + if (error) + return error; + + irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; + error = devm_request_threaded_irq(&ts->client->dev, ts->client->irq, + NULL, goodix_ts_irq_handler, + irq_flags, ts->client->name, ts); + if (error) { + dev_err(&ts->client->dev, "request IRQ failed: %d\n", error); + return error; + } + + return 0; +} + +/** + * goodix_config_cb - Callback to finish device init + * + * @ts: our goodix_ts_data pointer + * + * request_firmware_wait callback that finishes + * initialization of the device. + */ +static void goodix_config_cb(const struct firmware *cfg, void *ctx) +{ + struct goodix_ts_data *ts = ctx; + int error; + + if (cfg) { + /* send device configuration to the firmware */ + error = goodix_send_cfg(ts, cfg); + if (error) + goto err_release_cfg; + } + + goodix_configure_dev(ts); + +err_release_cfg: + release_firmware(cfg); + complete_all(&ts->firmware_loading_complete); +} + static int goodix_ts_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct goodix_ts_data *ts; - unsigned long irq_flags; int error; - u16 version_info, id_info; dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr); @@ -512,6 +671,7 @@ static int goodix_ts_probe(struct i2c_client *client, ts->client = client; i2c_set_clientdata(client, ts); + init_completion(&ts->firmware_loading_complete); error = goodix_get_gpio_config(ts); if (error) @@ -532,32 +692,51 @@ static int goodix_ts_probe(struct i2c_client *client, return error; } - error = goodix_read_version(client, &version_info, &id_info); + error = goodix_read_version(ts); if (error) { dev_err(&client->dev, "Read version failed.\n"); return error; } - ts->cfg_len = goodix_get_cfg_len(id_info); - - goodix_read_config(ts); + ts->cfg_len = goodix_get_cfg_len(ts->id); - error = goodix_request_input_dev(ts, version_info, id_info); - if (error) - return error; + if (ts->gpiod_int && ts->gpiod_rst) { + /* update device config */ + ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL, + "goodix_%d_cfg.bin", ts->id); + if (!ts->cfg_name) + return -ENOMEM; + + error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name, + &client->dev, GFP_KERNEL, ts, + goodix_config_cb); + if (error) { + dev_err(&client->dev, + "Failed to invoke firmware loader: %d\n", + error); + return error; + } - irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; - error = devm_request_threaded_irq(&ts->client->dev, client->irq, - NULL, goodix_ts_irq_handler, - irq_flags, client->name, ts); - if (error) { - dev_err(&client->dev, "request IRQ failed: %d\n", error); - return error; + return 0; + } else { + error = goodix_configure_dev(ts); + if (error) + return error; } return 0; } +static int goodix_ts_remove(struct i2c_client *client) +{ + struct goodix_ts_data *ts = i2c_get_clientdata(client); + + if (ts->gpiod_int && ts->gpiod_rst) + wait_for_completion(&ts->firmware_loading_complete); + + return 0; +} + static const struct i2c_device_id goodix_ts_id[] = { { "GDIX1001:00", 0 }, { } @@ -588,6 +767,7 @@ MODULE_DEVICE_TABLE(of, goodix_of_match); static struct i2c_driver goodix_ts_driver = { .probe = goodix_ts_probe, + .remove = goodix_ts_remove, .id_table = goodix_ts_id, .driver = { .name = "Goodix-TS", |