[PATCH v2 4/9] thermal: rockchip: improve the conversion function

Caesar Wang
2015-11-05T05:18:00Z

We should make the conversion table in as a parameter since the different
SoCs have the different conversionion table.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
---

Changes in v2:
- make the conversion table in as a parameter both code_to_temp
and temp_to_code function.
Series-changes: 1
- As Dmitry comment, make the conversion table in as a parameter.

Changes in v1: None

drivers/thermal/rockchip_thermal.c | 82 +++++++++++++++++++++++++-------------
1 file changed, 55 insertions(+), 27 deletions(-)

diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index bdf7063..e828f18 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -58,6 +58,16 @@ enum sensor_id {
*/
#define SOC_MAX_SENSORS 2

+struct chip_tsadc_table {
+ const struct tsadc_table *id;
+
+ /* the array table size*/
+ unsigned int length;
+
+ /* that analogic mask data */
+ unsigned long data_mask;
+};
+
struct rockchip_tsadc_chip {
/* The sensor id of chip correspond to the ADC channel */
int chn_id[SOC_MAX_SENSORS];
@@ -74,9 +84,14 @@ struct rockchip_tsadc_chip {
void (*control)(void __iomem *reg, bool on);

/* Per-sensor methods */
- int (*get_temp)(int chn, void __iomem *reg, int *temp);
- void (*set_tshut_temp)(int chn, void __iomem *reg, long temp);
+ int (*get_temp)(struct chip_tsadc_table table,
+ int chn, void __iomem *reg, int *temp);
+ void (*set_tshut_temp)(struct chip_tsadc_table table,
+ int chn, void __iomem *reg, long temp);
void (*set_tshut_mode)(int chn, void __iomem *reg, enum tshut_mode m);
+
+ /* Per-table methods */
+ struct chip_tsadc_table table;
};

struct rockchip_thermal_sensor {
@@ -172,21 +187,22 @@ static const struct tsadc_table v2_code_table[] = {
{3421, 125000},
};

-static u32 rk_tsadcv2_temp_to_code(long temp)
+static u32 rk_tsadcv2_temp_to_code(struct chip_tsadc_table table,
+ long temp)
{
int high, low, mid;

low = 0;
- high = ARRAY_SIZE(v2_code_table) - 1;
+ high = table.length - 1;
mid = (high + low) / 2;

- if (temp < v2_code_table[low].temp || temp > v2_code_table[high].temp)
+ if (temp < table.id[low].temp || temp > table.id[high].temp)
return 0;

while (low <= high) {
- if (temp == v2_code_table[mid].temp)
- return v2_code_table[mid].code;
- else if (temp < v2_code_table[mid].temp)
+ if (temp == table.id[mid].temp)
+ return table.id[mid].code;
+ else if (temp < table.id[mid].temp)
high = mid - 1;
else
low = mid + 1;
@@ -196,25 +212,26 @@ static u32 rk_tsadcv2_temp_to_code(long temp)
return 0;
}

-static int rk_tsadcv2_code_to_temp(u32 code, int *temp)
+static int rk_tsadcv2_code_to_temp(struct chip_tsadc_table table, u32 code,
+ int *temp)
{
unsigned int low = 1;
- unsigned int high = ARRAY_SIZE(v2_code_table) - 1;
+ unsigned int high = table.length - 1;
unsigned int mid = (low + high) / 2;
unsigned int num;
unsigned long denom;

- BUILD_BUG_ON(ARRAY_SIZE(v2_code_table) < 2);
+ WARN_ON(table.length < 2);

- code &= TSADCV2_DATA_MASK;
- if (code < v2_code_table[high].code)
+ code &= table.data_mask;
+ if (code < table.id[high].code)
return -EAGAIN; /* Incorrect reading */

while (low <= high) {
- if (code >= v2_code_table[mid].code &&
- code < v2_code_table[mid - 1].code)
+ if (code >= table.id[mid].code &&
+ code < table.id[mid - 1].code)
break;
- else if (code < v2_code_table[mid].code)
+ else if (code < table.id[mid].code)
low = mid + 1;
else
high = mid - 1;
@@ -227,10 +244,10 @@ static int rk_tsadcv2_code_to_temp(u32 code, int *temp)
* temperature between 2 table entries is linear and interpolate
* to produce less granular result.
*/
- num = v2_code_table[mid].temp - v2_code_table[mid - 1].temp;
- num *= v2_code_table[mid - 1].code - code;
- denom = v2_code_table[mid - 1].code - v2_code_table[mid].code;
- *temp = v2_code_table[mid - 1].temp + (num / denom);
+ num = table.id[mid].temp - v2_code_table[mid - 1].temp;
+ num *= table.id[mid - 1].code - code;
+ denom = table.id[mid - 1].code - table.id[mid].code;
+ *temp = table.id[mid - 1].temp + (num / denom);

return 0;
}
@@ -290,20 +307,22 @@ static void rk_tsadcv2_control(void __iomem *regs, bool enable)
writel_relaxed(val, regs + TSADCV2_AUTO_CON);
}

-static int rk_tsadcv2_get_temp(int chn, void __iomem *regs, int *temp)
+static int rk_tsadcv2_get_temp(struct chip_tsadc_table table,
+ int chn, void __iomem *regs, int *temp)
{
u32 val;

val = readl_relaxed(regs + TSADCV2_DATA(chn));

- return rk_tsadcv2_code_to_temp(val, temp);
+ return rk_tsadcv2_code_to_temp(table, val, temp);
}

-static void rk_tsadcv2_tshut_temp(int chn, void __iomem *regs, long temp)
+static void rk_tsadcv2_tshut_temp(struct chip_tsadc_table table,
+ int chn, void __iomem *regs, long temp)
{
u32 tshut_value, val;

- tshut_value = rk_tsadcv2_temp_to_code(temp);
+ tshut_value = rk_tsadcv2_temp_to_code(table, temp);
writel_relaxed(tshut_value, regs + TSADCV2_COMP_SHUT(chn));

/* TSHUT will be valid */
@@ -343,6 +362,12 @@ static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
.get_temp = rk_tsadcv2_get_temp,
.set_tshut_temp = rk_tsadcv2_tshut_temp,
.set_tshut_mode = rk_tsadcv2_tshut_mode,
+
+ .table = {
+ .id = v2_code_table,
+ .length = ARRAY_SIZE(v2_code_table),
+ .data_mask = TSADCV2_DATA_MASK,
+ },
};

static const struct of_device_id of_rockchip_thermal_match[] = {
@@ -385,7 +410,8 @@ static int rockchip_thermal_get_temp(void *_sensor, int *out_temp)
const struct rockchip_tsadc_chip *tsadc = sensor->thermal->chip;
int retval;

- retval = tsadc->get_temp(sensor->id, thermal->regs, out_temp);
+ retval = tsadc->get_temp(tsadc->table,
+ sensor->id, thermal->regs, out_temp);
dev_dbg(&thermal->pdev->dev, "sensor %d - temp: %d, retval: %d\n",
sensor->id, *out_temp, retval);

@@ -463,7 +489,8 @@ rockchip_thermal_register_sensor(struct platform_device *pdev,
int error;

tsadc->set_tshut_mode(id, thermal->regs, thermal->tshut_mode);
- tsadc->set_tshut_temp(id, thermal->regs, thermal->tshut_temp);
+ tsadc->set_tshut_temp(tsadc->table, id, thermal->regs,
+ thermal->tshut_temp);

sensor->thermal = thermal;
sensor->id = id;
@@ -681,7 +708,8 @@ static int __maybe_unused rockchip_thermal_resume(struct device *dev)

thermal->chip->set_tshut_mode(id, thermal->regs,
thermal->tshut_mode);
- thermal->chip->set_tshut_temp(id, thermal->regs,
+ thermal->chip->set_tshut_temp(thermal->chip->table,
+ id, thermal->regs,
thermal->tshut_temp);
}

--
1.9.1