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path: root/drivers/mfd/twl4030-madc.c
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Diffstat (limited to 'drivers/mfd/twl4030-madc.c')
-rw-r--r--drivers/mfd/twl4030-madc.c145
1 files changed, 72 insertions, 73 deletions
diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
index 93ef91229cd3..98b9c9874d26 100644
--- a/drivers/mfd/twl4030-madc.c
+++ b/drivers/mfd/twl4030-madc.c
@@ -49,22 +49,22 @@
#include <linux/iio/iio.h>
-/*
+/**
* struct twl4030_madc_data - a container for madc info
- * @dev - pointer to device structure for madc
- * @lock - mutex protecting this data structure
- * @requests - Array of request struct corresponding to SW1, SW2 and RT
- * @use_second_irq - IRQ selection (main or co-processor)
- * @imr - Interrupt mask register of MADC
- * @isr - Interrupt status register of MADC
+ * @dev: Pointer to device structure for madc
+ * @lock: Mutex protecting this data structure
+ * @requests: Array of request struct corresponding to SW1, SW2 and RT
+ * @use_second_irq: IRQ selection (main or co-processor)
+ * @imr: Interrupt mask register of MADC
+ * @isr: Interrupt status register of MADC
*/
struct twl4030_madc_data {
struct device *dev;
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,
@@ -155,17 +155,16 @@ 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
};
/*
@@ -197,11 +196,12 @@ const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
},
};
-/*
- * Function to read a particular channel value.
- * @madc - pointer to struct twl4030_madc_data
- * @reg - lsb of ADC Channel
- * If the i2c read fails it returns an error else returns 0.
+/**
+ * twl4030_madc_channel_raw_read() - Function to read a particular channel value
+ * @madc: pointer to struct twl4030_madc_data
+ * @reg: lsb of ADC Channel
+ *
+ * Return: 0 on success, an error code otherwise.
*/
static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
{
@@ -227,7 +227,7 @@ 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)
@@ -236,18 +236,18 @@ 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;
}
@@ -269,11 +269,12 @@ 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
@@ -284,17 +285,17 @@ 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;
+ reg = reg_base + (2 * i);
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++;
@@ -305,7 +306,7 @@ 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;
@@ -315,7 +316,7 @@ 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++;
@@ -336,8 +337,6 @@ 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;
}
@@ -361,13 +360,13 @@ 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;
@@ -430,7 +429,7 @@ 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++) {
@@ -512,21 +511,17 @@ 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;
@@ -623,8 +618,8 @@ 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;
}
}
@@ -665,10 +660,6 @@ 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;
@@ -689,20 +680,25 @@ int twl4030_get_madc_conversion(int channel_no)
}
EXPORT_SYMBOL_GPL(twl4030_get_madc_conversion);
-/*
+/**
+ * twl4030_madc_set_current_generator() - setup bias current
+ *
+ * @madc: pointer to twl4030_madc_data struct
+ * @chan: can be one of the two values:
+ * TWL4030_BCI_ITHEN
+ * Enables bias current for main battery type reading
+ * TWL4030_BCI_TYPEN
+ * Enables bias current for main battery temperature sensing
+ * @on: enable or disable chan.
+ *
* Function to enable or disable bias current for
* main battery type reading or temperature sensing
- * @madc - pointer to twl4030_madc_data struct
- * @chan - can be one of the two values
- * TWL4030_BCI_ITHEN - Enables bias current for main battery type reading
- * TWL4030_BCI_TYPEN - Enables bias current for main battery temperature
- * sensing
- * @on - enable or disable chan.
*/
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,
@@ -712,10 +708,13 @@ 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) {
@@ -730,7 +729,7 @@ 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)
@@ -909,7 +908,7 @@ static struct platform_driver twl4030_madc_driver = {
.name = "twl4030_madc",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(twl_madc_of_match),
- },
+ },
};
module_platform_driver(twl4030_madc_driver);
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-10 09:29:35 +0000