On Thu, Oct 08, 2015 at 01:19:29PM +0300, Irina Tirdea wrote:
> Goodix devices can be configured by writing custom data to the device at
> init. The configuration data is read with request_firmware from
> "goodix_<id>_cfg.bin", where <id> is the product id read from the device
> (e.g.: goodix_911_cfg.bin for Goodix GT911, goodix_9271_cfg.bin for
> GT9271).
>
> The configuration information has a specific format described in the Goodix
> datasheet. It includes X/Y resolution, maximum supported touch points,
> interrupt flags, various sensitivity factors and settings for advanced
> features (like gesture recognition).
>
> Before writing the firmware, it is necessary to reset the device. If
> the device ACPI/DT information does not declare gpio pins (needed for
> reset), writing the firmware will not be available for these devices.
>
> This is based on Goodix datasheets for GT911 and GT9271 and on Goodix
> driver gt9xx.c for Android (publicly available in Android kernel
> trees for various devices).
>
> Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx>
> Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx>
> ---
> drivers/input/touchscreen/goodix.c | 229 +++++++++++++++++++++++++++++++------
> 1 file changed, 196 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index 916198d..37035fb 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.h>
> #include <linux/i2c.h>
> #include <linux/input.h>
> @@ -40,6 +41,9 @@ struct goodix_ts_data {
> int cfg_len;
> struct gpio_desc *gpiod_int;
> struct gpio_desc *gpiod_rst;
> + u16 id;
> + u16 version;
> + char *cfg_name;
> };
>
> #define GOODIX_GPIO_INT_NAME "irq"
> @@ -159,6 +163,39 @@ 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) {
> @@ -278,6 +315,73 @@ 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;
> @@ -432,30 +536,29 @@ 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;
> }
> @@ -489,13 +592,10 @@ 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;
>
> @@ -519,8 +619,8 @@ 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) {
> @@ -532,13 +632,70 @@ 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 = (struct goodix_ts_data *)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:
> + kfree(ts->cfg_name);
> + release_firmware(cfg);
You need to use completion to signal remove() (and also probably
suspend/resume in the subsequent patches) that you are done handling
config, otherwise if you do bind/unbind via sysfs in a tight loop you
will observe a nice crash.
Thanks.
> +}
> +
> 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);
>
> @@ -573,30 +730,36 @@ 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 = kasprintf(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);
> + kfree(ts->cfg_name);
> + 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;
> }
>
> - return 0;
> + return goodix_configure_dev(ts);
> }
>
> static int goodix_ts_remove(struct i2c_client *client)
> --
> 1.9.1
>
--
Dmitry
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