[RESEND PATCH v10 05/11] power: supply: bd70528: use linear ranges

From: Matti Vaittinen
Date: Wed Apr 29 2020 - 03:00:01 EST

Change the bd70528 to use common linear_range code instead of
implementing a copy of it in this driver.

Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---

Changes since v9:
- Add commas to last struct members as suggested by Andy

drivers/power/supply/Kconfig | 1 +
drivers/power/supply/bd70528-charger.c | 144 ++++++++++---------------
2 files changed, 56 insertions(+), 89 deletions(-)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f3424fdce341..9f19636db922 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -695,6 +695,7 @@ config CHARGER_UCS1002
config CHARGER_BD70528
tristate "ROHM bd70528 charger driver"
depends on MFD_ROHM_BD70528
+ select LINEAR_RANGES
default n
help
Say Y here to enable support for getting battery status
diff --git a/drivers/power/supply/bd70528-charger.c b/drivers/power/supply/bd70528-charger.c
index 3b820110ecfa..7c1f0b99c71b 100644
--- a/drivers/power/supply/bd70528-charger.c
+++ b/drivers/power/supply/bd70528-charger.c
@@ -72,6 +72,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
+#include <linux/linear_range.h>

#define CHG_STAT_SUSPEND 0x0
#define CHG_STAT_TRICKLE 0x1
@@ -335,38 +336,37 @@ static int bd70528_get_present(struct bd70528_psy *bdpsy, int *val)
return 0;
}

-struct bd70528_linear_range {
- int min;
- int step;
- int vals;
- int low_sel;
-};
-
-static const struct bd70528_linear_range current_limit_ranges[] = {
+static const struct linear_range current_limit_ranges[] = {
{
.min = 5,
.step = 1,
- .vals = 36,
- .low_sel = 0,
+ .min_sel = 0,
+ .max_sel = 0x22,
},
{
.min = 40,
.step = 5,
- .vals = 5,
- .low_sel = 0x23,
+ .min_sel = 0x23,
+ .max_sel = 0x26,
},
{
.min = 60,
.step = 20,
- .vals = 8,
- .low_sel = 0x27,
+ .min_sel = 0x27,
+ .max_sel = 0x2d,
},
{
.min = 200,
.step = 50,
- .vals = 7,
- .low_sel = 0x2e,
- }
+ .min_sel = 0x2e,
+ .max_sel = 0x34,
+ },
+ {
+ .min = 500,
+ .step = 0,
+ .min_sel = 0x35,
+ .max_sel = 0x3f,
+ },
};

/*
@@ -374,18 +374,18 @@ static const struct bd70528_linear_range current_limit_ranges[] = {
* voltage for low temperatures. The driver currently only reads
* the charge current at room temperature. We do set both though.
*/
-static const struct bd70528_linear_range warm_charge_curr[] = {
+static const struct linear_range warm_charge_curr[] = {
{
.min = 10,
.step = 10,
- .vals = 20,
- .low_sel = 0,
+ .min_sel = 0,
+ .max_sel = 0x12,
},
{
.min = 200,
.step = 25,
- .vals = 13,
- .low_sel = 0x13,
+ .min_sel = 0x13,
+ .max_sel = 0x1f,
},
};

@@ -398,56 +398,6 @@ static const struct bd70528_linear_range warm_charge_curr[] = {
#define MAX_WARM_CHG_CURR_SEL 0x1f
#define MIN_CHG_CURR_SEL 0x0

-static int find_value_for_selector_low(const struct bd70528_linear_range *r,
- int selectors, unsigned int sel,
- unsigned int *val)
-{
- int i;
-
- for (i = 0; i < selectors; i++) {
- if (r[i].low_sel <= sel && r[i].low_sel + r[i].vals >= sel) {
- *val = r[i].min + (sel - r[i].low_sel) * r[i].step;
- return 0;
- }
- }
- return -EINVAL;
-}
-
-/*
- * For BD70528 voltage/current limits we happily accept any value which
- * belongs the range. We could check if value matching the selector is
- * desired by computing the range min + (sel - sel_low) * range step - but
- * I guess it is enough if we use voltage/current which is closest (below)
- * the requested?
- */
-static int find_selector_for_value_low(const struct bd70528_linear_range *r,
- int selectors, unsigned int val,
- unsigned int *sel, bool *found)
-{
- int i;
- int ret = -EINVAL;
-
- *found = false;
- for (i = 0; i < selectors; i++) {
- if (r[i].min <= val) {
- if (r[i].min + r[i].step * r[i].vals >= val) {
- *found = true;
- *sel = r[i].low_sel + (val - r[i].min) /
- r[i].step;
- ret = 0;
- break;
- }
- /*
- * If the range max is smaller than requested
- * we can set the max supported value from range
- */
- *sel = r[i].low_sel + r[i].vals;
- ret = 0;
- }
- }
- return ret;
-}
-
static int get_charge_current(struct bd70528_psy *bdpsy, int *ma)
{
unsigned int sel;
@@ -463,9 +413,9 @@ static int get_charge_current(struct bd70528_psy *bdpsy, int *ma)

sel &= BD70528_MASK_CHG_CHG_CURR;

- ret = find_value_for_selector_low(&warm_charge_curr[0],
- ARRAY_SIZE(warm_charge_curr), sel,
- ma);
+ ret = linear_range_get_value_array(&warm_charge_curr[0],
+ ARRAY_SIZE(warm_charge_curr),
+ sel, ma);
if (ret) {
dev_err(bdpsy->dev,
"Unknown charge current value 0x%x\n",
@@ -491,10 +441,9 @@ static int get_current_limit(struct bd70528_psy *bdpsy, int *ma)

sel &= BD70528_MASK_CHG_DCIN_ILIM;

- ret = find_value_for_selector_low(&current_limit_ranges[0],
- ARRAY_SIZE(current_limit_ranges), sel,
- ma);
-
+ ret = linear_range_get_value_array(&current_limit_ranges[0],
+ ARRAY_SIZE(current_limit_ranges),
+ sel, ma);
if (ret) {
/* Unspecified values mean 500 mA */
*ma = 500;
@@ -588,15 +537,28 @@ static int set_charge_current(struct bd70528_psy *bdpsy, int ma)
goto set;
}

- ret = find_selector_for_value_low(&warm_charge_curr[0],
- ARRAY_SIZE(warm_charge_curr), ma,
- &reg, &found);
+/*
+ * For BD70528 voltage/current limits we happily accept any value which
+ * belongs the range. We could check if value matching the selector is
+ * desired by computing the range min + (sel - sel_low) * range step - but
+ * I guess it is enough if we use voltage/current which is closest (below)
+ * the requested?
+ */
+
+ ret = linear_range_get_selector_low_array(warm_charge_curr,
+ ARRAY_SIZE(warm_charge_curr),
+ ma, &reg, &found);
if (ret) {
+ dev_err(bdpsy->dev,
+ "Unsupported charge current %u mA\n", ma);
reg = MIN_CHG_CURR_SEL;
goto set;
}
if (!found) {
- /* There was a gap in supported values and we hit it */
+ /*
+ * There was a gap in supported values and we hit it.
+ * Yet a smaller value was found so we use it.
+ */
dev_warn(bdpsy->dev,
"Unsupported charge current %u mA\n", ma);
}
@@ -648,17 +610,21 @@ static int set_current_limit(struct bd70528_psy *bdpsy, int ma)
goto set;
}

- ret = find_selector_for_value_low(&current_limit_ranges[0],
- ARRAY_SIZE(current_limit_ranges), ma,
- &reg, &found);
+ ret = linear_range_get_selector_low_array(current_limit_ranges,
+ ARRAY_SIZE(current_limit_ranges),
+ ma, &reg, &found);
if (ret) {
+ dev_err(bdpsy->dev, "Unsupported current limit %umA\n", ma);
reg = MIN_CURR_LIMIT_SEL;
goto set;
}
if (!found) {
- /* There was a gap in supported values and we hit it ?*/
- dev_warn(bdpsy->dev, "Unsupported current limit %umA\n",
- ma);
+ /*
+ * There was a gap in supported values and we hit it.
+ * We found a smaller value from ranges and use it.
+ * Warn user though.
+ */
+ dev_warn(bdpsy->dev, "Unsupported current limit %umA\n", ma);
}

set:
--
2.21.0


--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]