On 26/02/14 20:03, Sebastian Reichel wrote:
Some style fixes in twl4030-madc driver.
Reported-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
Good stuff, but would be nice to hammer the comments into proper kernel-doc
style rather than going part of the way. Also, the ARRAY_SIZE bit
that both Lee and I picked up on in the previous patch snuck into
this one instead. Please move it back one patch.
---
drivers/mfd/twl4030-madc.c | 106 ++++++++++++++++++---------------------
include/linux/i2c/twl4030-madc.h | 2 +-
2 files changed, 51 insertions(+), 57 deletions(-)
diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
index 37cb3ad..c90013e 100644
--- a/drivers/mfd/twl4030-madc.c
+++ b/drivers/mfd/twl4030-madc.c
@@ -49,7 +49,7 @@
#include <linux/iio/iio.h>
-/*
+/**
* struct twl4030_madc_data - a container for madc info
@dev: for kerneldoc.
* @dev - pointer to device structure for madc
* @lock - mutex protecting this data structure
@@ -63,8 +63,8 @@ struct twl4030_madc_data {
struct mutex lock; /* mutex protecting this data structure */
struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
bool use_second_irq;
- int imr;
- int isr;
+ u8 imr;
+ u8 isr;
};
static int twl4030_madc_read(struct iio_dev *iio_dev,
@@ -157,17 +157,16 @@ twl4030_divider_ratios[16] = {
};
-/*
- * Conversion table from -3 to 55 degree Celcius
- */
-static int therm_tbl[] = {
-30800, 29500, 28300, 27100,
-26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900,
-17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100,
-11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310,
-8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830,
-5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170,
-4040, 3910, 3790, 3670, 3550
+/* Conversion table from -3 to 55 degrees Celcius */
+static int twl4030_therm_tbl[] = {
+ 30800, 29500, 28300, 27100,
+ 26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700,
+ 17900, 17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100,
+ 12600, 12100, 11600, 11200, 10800, 10400, 10000, 9630, 9280,
+ 8950, 8620, 8310, 8020, 7730, 7460, 7200, 6950, 6710,
+ 6470, 6250, 6040, 5830, 5640, 5450, 5260, 5090, 4920,
+ 4760, 4600, 4450, 4310, 4170, 4040, 3910, 3790, 3670,
+ 3550
};
/*
@@ -199,7 +198,7 @@ const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
},
};
-/*
+/**
Whilst better - these are still not in kernel doc. Please read the nano howto
and fix them up.
* Function to read a particular channel value.
* @madc - pointer to struct twl4030_madc_data
* @reg - lsb of ADC Channel
@@ -229,7 +228,7 @@ static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
}
/*
- * Return battery temperature
+ * Return battery temperature in degrees Celsius
* Or < 0 on failure.
*/
static int twl4030battery_temperature(int raw_volt)
@@ -238,18 +237,18 @@ static int twl4030battery_temperature(int raw_volt)
int temp, curr, volt, res, ret;
volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
- /* Getting and calculating the supply current in micro ampers */
+ /* Getting and calculating the supply current in micro amperes */
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
REG_BCICTL2);
if (ret < 0)
return ret;
+
curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10;
/* Getting and calculating the thermistor resistance in ohms */
res = volt * 1000 / curr;
/* calculating temperature */
for (temp = 58; temp >= 0; temp--) {
- int actual = therm_tbl[temp];
-
+ int actual = twl4030_therm_tbl[temp];
if ((actual - res) >= 0)
break;
}
@@ -271,11 +270,12 @@ static int twl4030battery_current(int raw_volt)
else /* slope of 0.88 mV/mA */
return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
}
+
/*
* Function to read channel values
* @madc - pointer to twl4030_madc_data struct
* @reg_base - Base address of the first channel
- * @Channels - 16 bit bitmap. If the bit is set, channel value is read
+ * @Channels - 16 bit bitmap. If the bit is set, channel's value is read
* @buf - The channel values are stored here. if read fails error
* @raw - Return raw values without conversion
* value is stored
@@ -286,17 +286,17 @@ static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
long channels, int *buf,
bool raw)
{
- int count = 0, count_req = 0, i;
+ int count = 0;
+ int i;
u8 reg;
for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
- reg = reg_base + 2 * i;
+ u8 reg = reg_base + (2 * i);
Precedence means the brackets aren't needed. I don't suppose they do
much harm though if you want to keep them.
buf[i] = twl4030_madc_channel_raw_read(madc, reg);
if (buf[i] < 0) {
- dev_err(madc->dev,
- "Unable to read register 0x%X\n", reg);
- count_req++;
- continue;
+ dev_err(madc->dev, "Unable to read register 0x%X\n",
+ reg);
+ return buf[i];
}
if (raw) {
count++;
@@ -307,7 +307,7 @@ static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
buf[i] = twl4030battery_current(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading current\n");
- count_req++;
+ return buf[i];
} else {
count++;
buf[i] = buf[i] - 750;
@@ -317,7 +317,7 @@ static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
buf[i] = twl4030battery_temperature(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading temperature\n");
- count_req++;
+ return buf[i];
} else {
buf[i] -= 3;
count++;
@@ -338,8 +338,6 @@ static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
twl4030_divider_ratios[i].numerator);
}
}
- if (count_req)
- dev_err(madc->dev, "%d channel conversion failed\n", count_req);
return count;
}
@@ -363,13 +361,13 @@ static int twl4030_madc_enable_irq(struct twl4030_madc_data *madc, u8 id)
madc->imr);
return ret;
}
+
val &= ~(1 << id);
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
if (ret) {
dev_err(madc->dev,
"unable to write imr register 0x%X\n", madc->imr);
return ret;
-
}
return 0;
@@ -432,7 +430,7 @@ static irqreturn_t twl4030_madc_threaded_irq_handler(int irq, void *_madc)
continue;
ret = twl4030_madc_disable_irq(madc, i);
if (ret < 0)
- dev_dbg(madc->dev, "Disable interrupt failed%d\n", i);
+ dev_dbg(madc->dev, "Disable interrupt failed %d\n", i);
madc->requests[i].result_pending = 1;
}
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
@@ -514,21 +512,17 @@ static int twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
{
const struct twl4030_madc_conversion_method *method;
int ret = 0;
+
+ if (conv_method != TWL4030_MADC_SW1 && conv_method != TWL4030_MADC_SW2)
+ return -ENOTSUPP;
+
method = &twl4030_conversion_methods[conv_method];
- switch (conv_method) {
- case TWL4030_MADC_SW1:
- case TWL4030_MADC_SW2:
- ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
- TWL4030_MADC_SW_START, method->ctrl);
- if (ret) {
- dev_err(madc->dev,
- "unable to write ctrl register 0x%X\n",
- method->ctrl);
- return ret;
- }
- break;
- default:
- break;
+ ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, TWL4030_MADC_SW_START,
+ method->ctrl);
+ if (ret) {
+ dev_err(madc->dev, "unable to write ctrl register 0x%X\n",
+ method->ctrl);
+ return ret;
}
return 0;
@@ -625,8 +619,8 @@ int twl4030_madc_conversion(struct twl4030_madc_request *req)
ch_lsb, method->avg);
if (ret) {
dev_err(twl4030_madc->dev,
- "unable to write sel reg 0x%X\n",
- method->sel + 1);
+ "unable to write avg reg 0x%X\n",
+ method->avg);
goto out;
}
}
@@ -667,10 +661,6 @@ out:
}
EXPORT_SYMBOL_GPL(twl4030_madc_conversion);
-/*
- * Return channel value
- * Or < 0 on failure.
- */
int twl4030_get_madc_conversion(int channel_no)
{
struct twl4030_madc_request req;
@@ -705,6 +695,7 @@ static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
int chan, int on)
{
int ret;
+ int regmask;
u8 regval;
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
@@ -714,10 +705,13 @@ static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
TWL4030_BCI_BCICTL1);
return ret;
}
+
+ regmask = chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
if (on)
- regval |= chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
+ regval |= regmask;
else
- regval &= chan ? ~TWL4030_BCI_ITHEN : ~TWL4030_BCI_TYPEN;
+ regval &= ~regmask;
+
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
regval, TWL4030_BCI_BCICTL1);
if (ret) {
@@ -732,7 +726,7 @@ static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
/*
* Function that sets MADC software power on bit to enable MADC
* @madc - pointer to twl4030_madc_data struct
- * @on - Enable or disable MADC software powen on bit.
+ * @on - Enable or disable MADC software power on bit.
* returns error if i2c read/write fails else 0
*/
static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
@@ -795,7 +789,7 @@ static int twl4030_madc_probe(struct platform_device *pdev)
iio_dev->info = &twl4030_madc_iio_info;
iio_dev->modes = INDIO_DIRECT_MODE;
iio_dev->channels = twl4030_madc_iio_channels;
- iio_dev->num_channels = 16;
+ iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);
Move this back into the previous patch please. We like to pretend that within
a series we got everything right first time ;)
/*
* Phoenix provides 2 interrupt lines. The first one is connected to
diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h
index 01f5951..1c0134d 100644
--- a/include/linux/i2c/twl4030-madc.h
+++ b/include/linux/i2c/twl4030-madc.h
@@ -44,7 +44,7 @@ struct twl4030_madc_conversion_method {
struct twl4030_madc_request {
unsigned long channels;
- u16 do_avg;
+ bool do_avg;
u16 method;
u16 type;
bool active;
--
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