diff options
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 102 |
1 files changed, 81 insertions, 21 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 40af02c2611..7f51d39ce2f 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -14,6 +14,8 @@ */ #include <linux/module.h> +#include <linux/init.h> +#include <linux/completion.h> #include <linux/delay.h> #include <linux/firmware.h> #include <linux/i2c.h> @@ -246,16 +248,19 @@ struct mxt_data { const struct mxt_platform_data *pdata; struct mxt_object *object_table; struct mxt_info info; - unsigned int irq; unsigned int max_x; unsigned int max_y; + bool in_bootloader; /* Cached parameters from object table */ u8 T6_reportid; u8 T9_reportid_min; u8 T9_reportid_max; u8 T19_reportid; + + /* for fw update in bootloader */ + struct completion bl_completion; }; static size_t mxt_obj_size(const struct mxt_object *obj) @@ -339,12 +344,50 @@ static void mxt_dump_message(struct device *dev, message->reportid, 7, message->message); } -static int mxt_check_bootloader(struct i2c_client *client, - unsigned int state) +static int mxt_wait_for_chg(struct mxt_data *data, unsigned int timeout_ms) { + struct device *dev = &data->client->dev; + struct completion *comp = &data->bl_completion; + unsigned long timeout = msecs_to_jiffies(timeout_ms); + long ret; + + ret = wait_for_completion_interruptible_timeout(comp, timeout); + if (ret < 0) { + return ret; + } else if (ret == 0) { + dev_err(dev, "Wait for completion timed out.\n"); + return -ETIMEDOUT; + } + return 0; +} + +static int mxt_check_bootloader(struct mxt_data *data, unsigned int state) +{ + struct i2c_client *client = data->client; u8 val; + int ret; recheck: + if (state != MXT_WAITING_BOOTLOAD_CMD) { + /* + * In application update mode, the interrupt + * line signals state transitions. We must wait for the + * CHG assertion before reading the status byte. + * Once the status byte has been read, the line is deasserted. + */ + ret = mxt_wait_for_chg(data, 300); + if (ret) { + /* + * TODO: handle -ERESTARTSYS better by terminating + * fw update process before returning to userspace + * by writing length 0x000 to device (iff we are in + * WAITING_FRAME_DATA state). + */ + dev_err(&client->dev, "Update wait error %d\n", ret); + return ret; + } + } + if (i2c_master_recv(client, &val, 1) != 1) { dev_err(&client->dev, "%s: i2c recv failed\n", __func__); return -EIO; @@ -590,9 +633,8 @@ static bool mxt_is_T9_message(struct mxt_data *data, struct mxt_message *msg) return (id >= data->T9_reportid_min && id <= data->T9_reportid_max); } -static irqreturn_t mxt_interrupt(int irq, void *dev_id) +static irqreturn_t mxt_process_messages_until_invalid(struct mxt_data *data) { - struct mxt_data *data = dev_id; struct mxt_message message; const u8 *payload = &message.message[0]; struct device *dev = &data->client->dev; @@ -632,6 +674,19 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static irqreturn_t mxt_interrupt(int irq, void *dev_id) +{ + struct mxt_data *data = dev_id; + + if (data->in_bootloader) { + /* bootloader state transition completion */ + complete(&data->bl_completion); + return IRQ_HANDLED; + } + + return mxt_process_messages_until_invalid(data); +} + static int mxt_check_reg_init(struct mxt_data *data) { const struct mxt_platform_data *pdata = data->pdata; @@ -947,6 +1002,8 @@ static int mxt_load_fw(struct device *dev, const char *fn) } /* Change to the bootloader mode */ + data->in_bootloader = true; + mxt_write_object(data, MXT_GEN_COMMAND_T6, MXT_COMMAND_RESET, MXT_BOOT_VALUE); msleep(MXT_RESET_TIME); @@ -957,18 +1014,19 @@ static int mxt_load_fw(struct device *dev, const char *fn) else client->addr = MXT_BOOT_HIGH; - ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD); + reinit_completion(&data->bl_completion); + + ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD); if (ret) - goto out; + goto disable_irq; /* Unlock bootloader */ mxt_unlock_bootloader(client); while (pos < fw->size) { - ret = mxt_check_bootloader(client, - MXT_WAITING_FRAME_DATA); + ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA); if (ret) - goto out; + goto disable_irq; frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1)); @@ -980,17 +1038,19 @@ static int mxt_load_fw(struct device *dev, const char *fn) /* Write one frame to device */ mxt_fw_write(client, fw->data + pos, frame_size); - ret = mxt_check_bootloader(client, - MXT_FRAME_CRC_PASS); + ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS); if (ret) - goto out; + goto disable_irq; pos += frame_size; dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size); } -out: + data->in_bootloader = false; + +disable_irq: + disable_irq(data->irq); release_firmware(fw); /* Change to slave address of application */ @@ -1009,8 +1069,6 @@ static ssize_t mxt_update_fw_store(struct device *dev, struct mxt_data *data = dev_get_drvdata(dev); int error; - disable_irq(data->irq); - error = mxt_load_fw(dev, MXT_FW_NAME); if (error) { dev_err(dev, "The firmware update failed(%d)\n", error); @@ -1024,13 +1082,13 @@ static ssize_t mxt_update_fw_store(struct device *dev, mxt_free_object_table(data); mxt_initialize(data); - } - enable_irq(data->irq); + enable_irq(data->irq); - error = mxt_make_highchg(data); - if (error) - return error; + error = mxt_make_highchg(data); + if (error) + return error; + } return count; } @@ -1120,6 +1178,8 @@ static int mxt_probe(struct i2c_client *client, data->pdata = pdata; data->irq = client->irq; + init_completion(&data->bl_completion); + mxt_calc_resolution(data); error = mxt_initialize(data); |