diff options
author | Jonathan Cameron <jic23@cam.ac.uk> | 2011-08-12 17:08:52 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-23 13:31:12 -0700 |
commit | e05e5f2336a94f127553c947dcfe2ce15f2c5f9a (patch) | |
tree | c0ff43619e0338a8584ba7a243beb9c6a5a3632a /drivers/staging | |
parent | 355e25c1de7c87e3629cdcb11c2f95719b5ed807 (diff) | |
download | linux-stable-e05e5f2336a94f127553c947dcfe2ce15f2c5f9a.tar.gz linux-stable-e05e5f2336a94f127553c947dcfe2ce15f2c5f9a.tar.bz2 linux-stable-e05e5f2336a94f127553c947dcfe2ce15f2c5f9a.zip |
staging:iio:light:tsl2583 allocate chip state with iio_dev
There are some unusual corners in the probe function of this
driver, so may need another look.
V2: Now with the check for allocation success not inverted.
V3: Now with the i2c devdata calls actually being correctly cast.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Tested-by: Jon Brenner <jbrenner@TAOSinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/iio/light/tsl2583.c | 216 |
1 files changed, 101 insertions, 115 deletions
diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c index 296d0ffa0b09..f75fe8563899 100644 --- a/drivers/staging/iio/light/tsl2583.c +++ b/drivers/staging/iio/light/tsl2583.c @@ -87,7 +87,6 @@ struct taos_settings { struct tsl2583_chip { struct mutex als_mutex; struct i2c_client *client; - struct iio_dev *iio_dev; struct taos_als_info als_cur_info; struct taos_settings taos_settings; int als_time_scale; @@ -159,8 +158,7 @@ static void taos_defaults(struct tsl2583_chip *chip) static int taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len) { - int ret; - int i; + int i, ret; for (i = 0; i < len; i++) { /* select register to write */ @@ -191,47 +189,47 @@ taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len) * the array are then used along with the time scale factor array values, to * calculate the lux. */ -static int taos_get_lux(struct i2c_client *client) +static int taos_get_lux(struct iio_dev *indio_dev) { u16 ch0, ch1; /* separated ch0/ch1 data from device */ u32 lux; /* raw lux calculated from device data */ u32 ratio; u8 buf[5]; struct taos_lux *p; - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); int i, ret; u32 ch0lux = 0; u32 ch1lux = 0; if (mutex_trylock(&chip->als_mutex) == 0) { - dev_info(&client->dev, "taos_get_lux device is busy\n"); + dev_info(&chip->client->dev, "taos_get_lux device is busy\n"); return chip->als_cur_info.lux; /* busy, so return LAST VALUE */ } if (chip->taos_chip_status != TSL258X_CHIP_WORKING) { /* device is not enabled */ - dev_err(&client->dev, "taos_get_lux device is not enabled\n"); + dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n"); ret = -EBUSY ; goto out_unlock; } - ret = taos_i2c_read(client, (TSL258X_CMD_REG), &buf[0], 1); + ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1); if (ret < 0) { - dev_err(&client->dev, "taos_get_lux failed to read CMD_REG\n"); + dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n"); goto out_unlock; } /* is data new & valid */ if (!(buf[0] & TSL258X_STA_ADC_INTR)) { - dev_err(&client->dev, "taos_get_lux data not valid\n"); + dev_err(&chip->client->dev, "taos_get_lux data not valid\n"); ret = chip->als_cur_info.lux; /* return LAST VALUE */ goto out_unlock; } for (i = 0; i < 4; i++) { int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i); - ret = taos_i2c_read(client, reg, &buf[i], 1); + ret = taos_i2c_read(chip->client, reg, &buf[i], 1); if (ret < 0) { - dev_err(&client->dev, "taos_get_lux failed to read" + dev_err(&chip->client->dev, "taos_get_lux failed to read" " register %x\n", reg); goto out_unlock; } @@ -239,11 +237,12 @@ static int taos_get_lux(struct i2c_client *client) /* clear status, really interrupt status (interrupts are off), but * we use the bit anyway - don't forget 0x80 - this is a command*/ - ret = i2c_smbus_write_byte(client, - (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN | TSL258X_CMD_ALS_INT_CLR)); + ret = i2c_smbus_write_byte(chip->client, + (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN | + TSL258X_CMD_ALS_INT_CLR)); if (ret < 0) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_i2c_write_command failed in taos_get_lux, err = %d\n", ret); goto out_unlock; /* have no data, so return failure */ @@ -285,7 +284,7 @@ static int taos_get_lux(struct i2c_client *client) /* note: lux is 31 bit max at this point */ if (ch1lux > ch0lux) { - dev_dbg(&client->dev, "No Data - Return last value\n"); + dev_dbg(&chip->client->dev, "No Data - Return last value\n"); ret = chip->als_cur_info.lux = 0; goto out_unlock; } @@ -319,54 +318,56 @@ out_unlock: * to derive actual lux). * Return updated gain_trim value. */ -int taos_als_calibrate(struct i2c_client *client) +static int taos_als_calibrate(struct iio_dev *indio_dev) { - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); u8 reg_val; unsigned int gain_trim_val; int ret; int lux_val; - ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | TSL258X_CNTRL)); + ret = i2c_smbus_write_byte(chip->client, + (TSL258X_CMD_REG | TSL258X_CNTRL)); if (ret < 0) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n", ret); return ret; } - reg_val = i2c_smbus_read_byte(client); + reg_val = i2c_smbus_read_byte(chip->client); if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_als_calibrate failed: device not powered on with ADC enabled\n"); return -1; } - ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | TSL258X_CNTRL)); + ret = i2c_smbus_write_byte(chip->client, + (TSL258X_CMD_REG | TSL258X_CNTRL)); if (ret < 0) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_als_calibrate failed to reach the STATUS register, ret=%d\n", ret); return ret; } - reg_val = i2c_smbus_read_byte(client); + reg_val = i2c_smbus_read_byte(chip->client); if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_als_calibrate failed: STATUS - ADC not valid.\n"); return -ENODATA; } - lux_val = taos_get_lux(client); + lux_val = taos_get_lux(indio_dev); if (lux_val < 0) { - dev_err(&client->dev, "taos_als_calibrate failed to get lux\n"); + dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n"); return lux_val; } gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target) * chip->taos_settings.als_gain_trim) / lux_val); if ((gain_trim_val < 250) || (gain_trim_val > 4000)) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_als_calibrate failed: trim_val of %d is out of range\n", gain_trim_val); return -ENODATA; @@ -380,21 +381,21 @@ int taos_als_calibrate(struct i2c_client *client) * Turn the device on. * Configuration must be set before calling this function. */ -static int taos_chip_on(struct i2c_client *client) +static int taos_chip_on(struct iio_dev *indio_dev) { int i; - int ret = 0; + int ret; u8 *uP; u8 utmp; int als_count; int als_time; - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); /* and make sure we're not already on */ if (chip->taos_chip_status == TSL258X_CHIP_WORKING) { /* if forcing a register update - turn off, then on */ - dev_info(&client->dev, "device is already enabled\n"); - return -EINVAL; + dev_info(&chip->client->dev, "device is already enabled\n"); + return -EINVAL; } /* determine als integration regster */ @@ -416,20 +417,21 @@ static int taos_chip_on(struct i2c_client *client) /* TSL258x Specific power-on / adc enable sequence * Power on the device 1st. */ utmp = TSL258X_CNTL_PWR_ON; - ret = i2c_smbus_write_byte_data(client, - TSL258X_CMD_REG | TSL258X_CNTRL, utmp); + ret = i2c_smbus_write_byte_data(chip->client, + TSL258X_CMD_REG | TSL258X_CNTRL, utmp); if (ret < 0) { - dev_err(&client->dev, "taos_chip_on failed on CNTRL reg.\n"); + dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n"); return -1; } /* Use the following shadow copy for our delay before enabling ADC. * Write all the registers. */ for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) { - ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG + i, + ret = i2c_smbus_write_byte_data(chip->client, + TSL258X_CMD_REG + i, *uP++); if (ret < 0) { - dev_err(&client->dev, + dev_err(&chip->client->dev, "taos_chip_on failed on reg %d.\n", i); return -1; } @@ -439,10 +441,11 @@ static int taos_chip_on(struct i2c_client *client) /* NOW enable the ADC * initialize the desired mode of operation */ utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL; - ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG | TSL258X_CNTRL, + ret = i2c_smbus_write_byte_data(chip->client, + TSL258X_CMD_REG | TSL258X_CNTRL, utmp); if (ret < 0) { - dev_err(&client->dev, "taos_chip_on failed on 2nd CTRL reg.\n"); + dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n"); return -1; } chip->taos_chip_status = TSL258X_CHIP_WORKING; @@ -450,33 +453,26 @@ static int taos_chip_on(struct i2c_client *client) return ret; } -static int taos_chip_off(struct i2c_client *client) +static int taos_chip_off(struct iio_dev *indio_dev) { - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); int ret; /* turn device off */ chip->taos_chip_status = TSL258X_CHIP_SUSPENDED; - ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG | TSL258X_CNTRL, + ret = i2c_smbus_write_byte_data(chip->client, + TSL258X_CMD_REG | TSL258X_CNTRL, 0x00); return ret; } /* Sysfs Interface Functions */ -static ssize_t taos_device_id(struct device *dev, -struct device_attribute *attr, char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; - - return sprintf(buf, "%s\n", chip->client->name); -} static ssize_t taos_power_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); return sprintf(buf, "%d\n", chip->taos_chip_status); } @@ -485,16 +481,15 @@ static ssize_t taos_power_state_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; unsigned long value; if (strict_strtoul(buf, 0, &value)) return -EINVAL; if (value == 0) - taos_chip_off(chip->client); + taos_chip_off(indio_dev); else - taos_chip_on(chip->client); + taos_chip_on(indio_dev); return len; } @@ -503,7 +498,7 @@ static ssize_t taos_gain_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); char gain[4] = {0}; switch (chip->taos_settings.als_gain) { @@ -528,7 +523,7 @@ static ssize_t taos_gain_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); unsigned long value; if (strict_strtoul(buf, 0, &value)) @@ -565,7 +560,7 @@ static ssize_t taos_als_time_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); return sprintf(buf, "%d\n", chip->taos_settings.als_time); } @@ -574,7 +569,7 @@ static ssize_t taos_als_time_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); unsigned long value; if (strict_strtoul(buf, 0, &value)) @@ -586,7 +581,7 @@ static ssize_t taos_als_time_store(struct device *dev, if (value % 50) return -EINVAL; - chip->taos_settings.als_time = value; + chip->taos_settings.als_time = value; return len; } @@ -602,7 +597,7 @@ static ssize_t taos_als_trim_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim); } @@ -611,7 +606,7 @@ static ssize_t taos_als_trim_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); unsigned long value; if (strict_strtoul(buf, 0, &value)) @@ -627,7 +622,7 @@ static ssize_t taos_als_cal_target_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target); } @@ -636,7 +631,7 @@ static ssize_t taos_als_cal_target_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; + struct tsl2583_chip *chip = iio_priv(indio_dev); unsigned long value; if (strict_strtoul(buf, 0, &value)) @@ -651,27 +646,26 @@ static ssize_t taos_als_cal_target_store(struct device *dev, static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; - int lux; + int ret; - lux = taos_get_lux(chip->client); + ret = taos_get_lux(dev_get_drvdata(dev)); + if (ret < 0) + return ret; - return sprintf(buf, "%d\n", lux); + return sprintf(buf, "%d\n", ret); } static ssize_t taos_do_calibrate(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; unsigned long value; if (strict_strtoul(buf, 0, &value)) return -EINVAL; if (value == 1) - taos_als_calibrate(chip->client); + taos_als_calibrate(indio_dev); return len; } @@ -703,8 +697,8 @@ static ssize_t taos_luxtable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct tsl2583_chip *chip = indio_dev->dev_data; - int value[ARRAY_SIZE(taos_device_lux)]; + struct tsl2583_chip *chip = iio_priv(indio_dev); + int value[ARRAY_SIZE(taos_device_lux)*3 + 1]; int n; get_options(buf, ARRAY_SIZE(value), value); @@ -725,18 +719,17 @@ static ssize_t taos_luxtable_store(struct device *dev, } if (chip->taos_chip_status == TSL258X_CHIP_WORKING) - taos_chip_off(chip->client); + taos_chip_off(indio_dev); /* Zero out the table */ memset(taos_device_lux, 0, sizeof(taos_device_lux)); memcpy(taos_device_lux, &value[1], (value[0] * 4)); - taos_chip_on(chip->client); + taos_chip_on(indio_dev); return len; } -static DEVICE_ATTR(name, S_IRUGO, taos_device_id, NULL); static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, taos_power_state_show, taos_power_state_store); @@ -762,7 +755,6 @@ static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR, taos_luxtable_show, taos_luxtable_store); static struct attribute *sysfs_attrs_ctrl[] = { - &dev_attr_name.attr, &dev_attr_power_state.attr, &dev_attr_illuminance0_calibscale.attr, /* Gain */ &dev_attr_illuminance0_calibscale_available.attr, @@ -798,9 +790,10 @@ static const struct iio_info tsl2583_info = { static int __devinit taos_probe(struct i2c_client *clientp, const struct i2c_device_id *idp) { - int i, ret = 0; + int i, ret; unsigned char buf[TSL258X_MAX_DEVICE_REGS]; - static struct tsl2583_chip *chip; + struct tsl2583_chip *chip; + struct iio_dev *indio_dev; if (!i2c_check_functionality(clientp->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { @@ -810,12 +803,15 @@ static int __devinit taos_probe(struct i2c_client *clientp, return -EOPNOTSUPP; } - chip = kzalloc(sizeof(struct tsl2583_chip), GFP_KERNEL); - if (!chip) - return -ENOMEM; - + indio_dev = iio_allocate_device(sizeof(*chip)); + if (indio_dev == NULL) { + ret = -ENOMEM; + dev_err(&clientp->dev, "iio allocation failed\n"); + goto fail1; + } + chip = iio_priv(indio_dev); chip->client = clientp; - i2c_set_clientdata(clientp, chip); + i2c_set_clientdata(clientp, indio_dev); mutex_init(&chip->als_mutex); chip->taos_chip_status = TSL258X_CHIP_UNKNOWN; @@ -827,14 +823,14 @@ static int __devinit taos_probe(struct i2c_client *clientp, if (ret < 0) { dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd " "reg failed in taos_probe(), err = %d\n", ret); - goto fail1; + goto fail2; } ret = i2c_smbus_read_byte(clientp); if (ret < 0) { dev_err(&clientp->dev, "i2c_smbus_read_byte from " "reg failed in taos_probe(), err = %d\n", ret); - goto fail1; + goto fail2; } buf[i] = ret; } @@ -842,58 +838,50 @@ static int __devinit taos_probe(struct i2c_client *clientp, if (!taos_tsl258x_device(buf)) { dev_info(&clientp->dev, "i2c device found but does not match " "expected id in taos_probe()\n"); - goto fail1; + goto fail2; } ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL)); if (ret < 0) { dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg " "failed in taos_probe(), err = %d\n", ret); - goto fail1; + goto fail2; } - chip->iio_dev = iio_allocate_device(0); - if (!chip->iio_dev) { - ret = -ENOMEM; - dev_err(&clientp->dev, "iio allocation failed\n"); - goto fail1; - } - - chip->iio_dev->info = &tsl2583_info; - chip->iio_dev->dev.parent = &clientp->dev; - chip->iio_dev->dev_data = (void *)(chip); - chip->iio_dev->modes = INDIO_DIRECT_MODE; - ret = iio_device_register(chip->iio_dev); + indio_dev->info = &tsl2583_info; + indio_dev->dev.parent = &clientp->dev; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->name = chip->client->name; + ret = iio_device_register(indio_dev); if (ret) { dev_err(&clientp->dev, "iio registration failed\n"); - goto fail1; + goto fail2; } /* Load up the V2 defaults (these are hard coded defaults for now) */ taos_defaults(chip); /* Make sure the chip is on */ - taos_chip_on(clientp); + taos_chip_on(indio_dev); dev_info(&clientp->dev, "Light sensor found.\n"); - return 0; - fail1: - kfree(chip); - + iio_free_device(indio_dev); +fail2: return ret; } static int taos_suspend(struct i2c_client *client, pm_message_t state) { - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); int ret = 0; mutex_lock(&chip->als_mutex); if (chip->taos_chip_status == TSL258X_CHIP_WORKING) { - ret = taos_chip_off(client); + ret = taos_chip_off(indio_dev); chip->taos_chip_status = TSL258X_CHIP_SUSPENDED; } @@ -903,13 +891,14 @@ static int taos_suspend(struct i2c_client *client, pm_message_t state) static int taos_resume(struct i2c_client *client) { - struct tsl2583_chip *chip = i2c_get_clientdata(client); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct tsl2583_chip *chip = iio_priv(indio_dev); int ret = 0; mutex_lock(&chip->als_mutex); if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED) - ret = taos_chip_on(client); + ret = taos_chip_on(indio_dev); mutex_unlock(&chip->als_mutex); return ret; @@ -918,11 +907,8 @@ static int taos_resume(struct i2c_client *client) static int __devexit taos_remove(struct i2c_client *client) { - struct tsl2583_chip *chip = i2c_get_clientdata(client); - - iio_device_unregister(chip->iio_dev); + iio_device_unregister(i2c_get_clientdata(client)); - kfree(chip); return 0; } |