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author | Iiro Valkonen <iiro.valkonen@atmel.com> | 2014-05-18 23:03:44 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-05-18 23:27:25 -0700 |
commit | a4a2ef462a5fb3a2d66cbf98dab124f34926f6bb (patch) | |
tree | 7bfc79e513e11a0090fd9eb83845ecdd83937dcf /drivers/input | |
parent | a0434b751d0a2cc29d264f26a48962c1648aac10 (diff) | |
download | linux-a4a2ef462a5fb3a2d66cbf98dab124f34926f6bb.tar.gz linux-a4a2ef462a5fb3a2d66cbf98dab124f34926f6bb.tar.bz2 linux-a4a2ef462a5fb3a2d66cbf98dab124f34926f6bb.zip |
Input: atmel_mxt_ts - make wait-after-reset period compatible with all chips
The delay before the chip can be accessed after reset varies between
different chips in maXTouch family. Waiting for an interrupt and a T6
status message with the RESET bit set is a better behaviour.
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Acked-by: Benson Leung <bleung@chromium.org>
Acked-by: Yufeng Shen <miletus@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 109 |
1 files changed, 87 insertions, 22 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index d5b30434c4ac..d3aef870d255 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -87,6 +87,9 @@ #define MXT_COMMAND_REPORTALL 3 #define MXT_COMMAND_DIAGNOSTIC 5 +/* Define for T6 status byte */ +#define MXT_T6_STATUS_RESET (1 << 7) + /* MXT_GEN_POWER_T7 field */ #define MXT_POWER_IDLEACQINT 0 #define MXT_POWER_ACTVACQINT 1 @@ -178,9 +181,13 @@ /* Define for MXT_GEN_COMMAND_T6 */ #define MXT_BOOT_VALUE 0xa5 +#define MXT_RESET_VALUE 0x01 #define MXT_BACKUP_VALUE 0x55 + +/* Delay times */ #define MXT_BACKUP_TIME 50 /* msec */ #define MXT_RESET_TIME 200 /* msec */ +#define MXT_RESET_TIMEOUT 3000 /* msec */ #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ @@ -255,12 +262,16 @@ struct mxt_data { /* Cached parameters from object table */ u8 T6_reportid; + u16 T6_address; u8 T9_reportid_min; u8 T9_reportid_max; u8 T19_reportid; /* for fw update in bootloader */ struct completion bl_completion; + + /* for reset handling */ + struct completion reset_completion; }; static size_t mxt_obj_size(const struct mxt_object *obj) @@ -344,10 +355,11 @@ static void mxt_dump_message(struct device *dev, message->reportid, 7, message->message); } -static int mxt_wait_for_chg(struct mxt_data *data, unsigned int timeout_ms) +static int mxt_wait_for_completion(struct mxt_data *data, + struct completion *comp, + 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; @@ -375,7 +387,8 @@ recheck: * CHG assertion before reading the status byte. * Once the status byte has been read, the line is deasserted. */ - ret = mxt_wait_for_chg(data, MXT_FW_CHG_TIMEOUT); + ret = mxt_wait_for_completion(data, &data->bl_completion, + MXT_FW_CHG_TIMEOUT); if (ret) { /* * TODO: handle -ERESTARTSYS better by terminating @@ -654,6 +667,9 @@ static irqreturn_t mxt_process_messages_until_invalid(struct mxt_data *data) unsigned csum = mxt_extract_T6_csum(&payload[1]); dev_dbg(dev, "Status: %02x Config Checksum: %06x\n", status, csum); + + if (status & MXT_T6_STATUS_RESET) + complete(&data->reset_completion); } else if (mxt_is_T9_message(data, &message)) { int id = reportid - data->T9_reportid_min; mxt_input_touchevent(data, &message, id); @@ -687,6 +703,59 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id) return mxt_process_messages_until_invalid(data); } +static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset, + u8 value, bool wait) +{ + u16 reg; + u8 command_register; + int timeout_counter = 0; + int ret; + + reg = data->T6_address + cmd_offset; + + ret = mxt_write_reg(data->client, reg, value); + if (ret) + return ret; + + if (!wait) + return 0; + + do { + msleep(20); + ret = __mxt_read_reg(data->client, reg, 1, &command_register); + if (ret) + return ret; + } while (command_register != 0 && timeout_counter++ <= 100); + + if (timeout_counter > 100) { + dev_err(&data->client->dev, "Command failed!\n"); + return -EIO; + } + + return 0; +} + +static int mxt_soft_reset(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + int ret = 0; + + dev_info(dev, "Resetting chip\n"); + + reinit_completion(&data->reset_completion); + + ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false); + if (ret) + return ret; + + ret = mxt_wait_for_completion(data, &data->reset_completion, + MXT_RESET_TIMEOUT); + if (ret) + return ret; + + return 0; +} + static int mxt_check_reg_init(struct mxt_data *data) { const struct mxt_platform_data *pdata = data->pdata; @@ -800,6 +869,7 @@ static int mxt_get_object_table(struct mxt_data *data) switch (object->type) { case MXT_GEN_COMMAND_T6: data->T6_reportid = min_id; + data->T6_address = object->start_address; break; case MXT_TOUCH_MULTI_T9: data->T9_reportid_min = min_id; @@ -853,16 +923,10 @@ static int mxt_initialize(struct mxt_data *data) if (error) goto err_free_object_table; - /* Backup to memory */ - mxt_write_object(data, MXT_GEN_COMMAND_T6, - MXT_COMMAND_BACKUPNV, - MXT_BACKUP_VALUE); - msleep(MXT_BACKUP_TIME); - - /* Soft reset */ - mxt_write_object(data, MXT_GEN_COMMAND_T6, - MXT_COMMAND_RESET, 1); - msleep(MXT_RESET_TIME); + error = mxt_t6_command(data, MXT_COMMAND_BACKUPNV, + MXT_BACKUP_VALUE, false); + if (!error) + mxt_soft_reset(data); /* Update matrix size at info struct */ error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val); @@ -1004,8 +1068,10 @@ 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); + ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_BOOT_VALUE, false); + if (ret) + goto release_firmware; + msleep(MXT_RESET_TIME); /* Change to slave address of bootloader */ @@ -1048,7 +1114,8 @@ static int mxt_load_fw(struct device *dev, const char *fn) } /* Wait for flash. */ - ret = mxt_wait_for_chg(data, MXT_FW_RESET_TIME); + ret = mxt_wait_for_completion(data, &data->bl_completion, + MXT_FW_RESET_TIME); if (ret) goto disable_irq; @@ -1057,12 +1124,13 @@ static int mxt_load_fw(struct device *dev, const char *fn) * the CHG line after bootloading has finished, so ignore potential * errors. */ - mxt_wait_for_chg(data, MXT_FW_RESET_TIME); + mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME); data->in_bootloader = false; disable_irq: disable_irq(data->irq); +release_firmware: release_firmware(fw); /* Change to slave address of application */ @@ -1187,6 +1255,7 @@ static int mxt_probe(struct i2c_client *client, data->irq = client->irq; init_completion(&data->bl_completion); + init_completion(&data->reset_completion); mxt_calc_resolution(data); @@ -1314,11 +1383,7 @@ static int mxt_resume(struct device *dev) struct mxt_data *data = i2c_get_clientdata(client); struct input_dev *input_dev = data->input_dev; - /* Soft reset */ - mxt_write_object(data, MXT_GEN_COMMAND_T6, - MXT_COMMAND_RESET, 1); - - msleep(MXT_RESET_TIME); + mxt_soft_reset(data); mutex_lock(&input_dev->mutex); 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