From: Guenter Roeck <linux@xxxxxxxxxxxx>
Using array size defines makes it much easier to find errors
in index values and loop counts.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/hwmon/it87.c | 58 ++++++++++++++++++++++++++++++----------------------
1 file changed, 34 insertions(+), 24 deletions(-)
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 0d6d106d53a2..118d4c756e40 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -260,6 +260,16 @@ static const u8 IT87_REG_VIN[] = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
#define IT87_REG_TEMP456_ENABLE 0x77
+#define NUM_VIN ARRAY_SIZE(IT87_REG_VIN)
+#define NUM_VIN_LIMIT 8
+#define NUM_TEMP 6
+#define NUM_TEMP_OFFSET ARRAY_SIZE(IT87_REG_TEMP_OFFSET)
+#define NUM_TEMP_LIMIT 3
+#define NUM_FAN ARRAY_SIZE(IT87_REG_FAN)
+#define NUM_FAN_DIV 3
+#define NUM_PWM ARRAY_SIZE(IT87_REG_PWM)
+#define NUM_AUTO_PWM ARRAY_SIZE(IT87_REG_PWM)
+
struct it87_devices {
const char *name;
const char * const suffix;
@@ -484,14 +494,14 @@ struct it87_data {
u16 in_scaled; /* Internal voltage sensors are scaled */
u16 in_internal; /* Bitfield, internal sensors (for labels) */
u16 has_in; /* Bitfield, voltage sensors enabled */
- u8 in[13][3]; /* [nr][0]=in, [1]=min, [2]=max */
+ u8 in[NUM_VIN][3]; /* [nr][0]=in, [1]=min, [2]=max */
u8 has_fan; /* Bitfield, fans enabled */
- u16 fan[6][2]; /* Register values, [nr][0]=fan, [1]=min */
+ u16 fan[NUM_FAN][2]; /* Register values, [nr][0]=fan, [1]=min */
u8 has_temp; /* Bitfield, temp sensors enabled */
- s8 temp[6][4]; /* [nr][0]=temp, [1]=min, [2]=max, [3]=offset */
+ s8 temp[NUM_TEMP][4]; /* [nr][0]=temp, [1]=min, [2]=max, [3]=offset */
u8 sensor; /* Register value (IT87_REG_TEMP_ENABLE) */
u8 extra; /* Register value (IT87_REG_TEMP_EXTRA) */
- u8 fan_div[3]; /* Register encoding, shifted right */
+ u8 fan_div[NUM_FAN_DIV];/* Register encoding, shifted right */
bool has_vid; /* True if VID supported */
u8 vid; /* Register encoding, combined */
u8 vrm;
@@ -512,13 +522,13 @@ struct it87_data {
* simple.
*/
u8 has_pwm; /* Bitfield, pwm control enabled */
- u8 pwm_ctrl[6]; /* Register value */
- u8 pwm_duty[6]; /* Manual PWM value set by user */
- u8 pwm_temp_map[6]; /* PWM to temp. chan. mapping (bits 1-0) */
+ u8 pwm_ctrl[NUM_PWM]; /* Register value */
+ u8 pwm_duty[NUM_PWM]; /* Manual PWM value set by user */
+ u8 pwm_temp_map[NUM_PWM];/* PWM to temp. chan. mapping (bits 1-0) */
/* Automatic fan speed control registers */
- u8 auto_pwm[3][4]; /* [nr][3] is hard-coded */
- s8 auto_temp[3][5]; /* [nr][0] is point1_temp_hyst */
+ u8 auto_pwm[NUM_AUTO_PWM][4]; /* [nr][3] is hard-coded */
+ s8 auto_temp[NUM_AUTO_PWM][5]; /* [nr][0] is point1_temp_hyst */
};
static int adc_lsb(const struct it87_data *data, int nr)
@@ -686,7 +696,7 @@ static struct it87_data *it87_update_device(struct device *dev)
it87_write_value(data, IT87_REG_CONFIG,
it87_read_value(data, IT87_REG_CONFIG) | 0x40);
}
- for (i = 0; i < ARRAY_SIZE(IT87_REG_VIN); i++) {
+ for (i = 0; i < NUM_VIN; i++) {
if (!(data->has_in & BIT(i)))
continue;
@@ -694,7 +704,7 @@ static struct it87_data *it87_update_device(struct device *dev)
it87_read_value(data, IT87_REG_VIN[i]);
/* VBAT and AVCC don't have limit registers */
- if (i >= 8)
+ if (i >= NUM_VIN_LIMIT)
continue;
data->in[i][1] =
@@ -703,7 +713,7 @@ static struct it87_data *it87_update_device(struct device *dev)
it87_read_value(data, IT87_REG_VIN_MAX(i));
}
- for (i = 0; i < 6; i++) {
+ for (i = 0; i < NUM_FAN; i++) {
/* Skip disabled fans */
if (!(data->has_fan & BIT(i)))
continue;
@@ -720,24 +730,24 @@ static struct it87_data *it87_update_device(struct device *dev)
IT87_REG_FANX_MIN[i]) << 8;
}
}
- for (i = 0; i < 6; i++) {
+ for (i = 0; i < NUM_TEMP; i++) {
if (!(data->has_temp & BIT(i)))
continue;
data->temp[i][0] =
it87_read_value(data, IT87_REG_TEMP(i));
- /* No limits/offset for additional sensors */
- if (i >= 3)
+ if (has_temp_offset(data) && i < NUM_TEMP_OFFSET)
+ data->temp[i][3] =
+ it87_read_value(data,
+ IT87_REG_TEMP_OFFSET[i]);
+
+ if (i >= NUM_TEMP_LIMIT)
continue;
data->temp[i][1] =
it87_read_value(data, IT87_REG_TEMP_LOW(i));
data->temp[i][2] =
it87_read_value(data, IT87_REG_TEMP_HIGH(i));
- if (has_temp_offset(data))
- data->temp[i][3] =
- it87_read_value(data,
- IT87_REG_TEMP_OFFSET[i]);
}
/* Newer chips don't have clock dividers */
@@ -757,7 +767,7 @@ static struct it87_data *it87_update_device(struct device *dev)
data->fan_main_ctrl = it87_read_value(data,
IT87_REG_FAN_MAIN_CTRL);
data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
- for (i = 0; i < 6; i++)
+ for (i = 0; i < NUM_PWM; i++)
it87_update_pwm_ctrl(data, i);
data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
@@ -2509,7 +2519,7 @@ static void it87_init_device(struct platform_device *pdev)
* these have separate registers for the temperature mapping and the
* manual duty cycle.
*/
- for (i = 0; i < 3; i++) {
+ for (i = 0; i < NUM_AUTO_PWM; i++) {
data->pwm_temp_map[i] = i;
data->pwm_duty[i] = 0x7f; /* Full speed */
data->auto_pwm[i][3] = 0x7f; /* Full speed, hard-coded */
@@ -2522,12 +2532,12 @@ static void it87_init_device(struct platform_device *pdev)
* means -1 degree C, which surprisingly doesn't trigger an alarm,
* but is still confusing, so change to 127 degrees C.
*/
- for (i = 0; i < 8; i++) {
+ for (i = 0; i < NUM_VIN_LIMIT; i++) {
tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
if (tmp == 0xff)
it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
}
- for (i = 0; i < 3; i++) {
+ for (i = 0; i < NUM_TEMP_LIMIT; i++) {
tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
if (tmp == 0xff)
it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
@@ -2620,7 +2630,7 @@ static int it87_check_pwm(struct device *dev)
int i;
u8 pwm[3];
- for (i = 0; i < 3; i++)
+ for (i = 0; i < ARRAY_SIZE(pwm); i++)
pwm[i] = it87_read_value(data,
IT87_REG_PWM[i]);
--
2.1.4
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