[PATCH V10 4/8] backlight: qcom-wled: Rename PM8941* to WLED3

Kiran Gunda
2019-11-01T06:28:09Z

Rename the PM8941* references as WLED3 to make the driver
generic and have WLED support for other PMICs. Also rename
"i_boost_limit" and "i_limit" variables to "boost_i_limit"
and "string_i_limit" respectively to resemble the corresponding
register names.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
drivers/video/backlight/qcom-wled.c | 248 ++++++++++++++++++------------------
1 file changed, 125 insertions(+), 123 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 82b8572..f191242 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -10,77 +10,79 @@
#include <linux/regmap.h>

/* From DT binding */
-#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048
+#define WLED_DEFAULT_BRIGHTNESS 2048

-#define PM8941_WLED_REG_VAL_BASE 0x40
-#define PM8941_WLED_REG_VAL_MAX 0xFFF
+#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF
+#define WLED3_CTRL_REG_VAL_BASE 0x40

-#define PM8941_WLED_REG_MOD_EN 0x46
-#define PM8941_WLED_REG_MOD_EN_BIT BIT(7)
-#define PM8941_WLED_REG_MOD_EN_MASK BIT(7)
+/* WLED3 control registers */
+#define WLED3_CTRL_REG_MOD_EN 0x46
+#define WLED3_CTRL_REG_MOD_EN_BIT BIT(7)
+#define WLED3_CTRL_REG_MOD_EN_MASK BIT(7)

-#define PM8941_WLED_REG_SYNC 0x47
-#define PM8941_WLED_REG_SYNC_MASK 0x07
-#define PM8941_WLED_REG_SYNC_LED1 BIT(0)
-#define PM8941_WLED_REG_SYNC_LED2 BIT(1)
-#define PM8941_WLED_REG_SYNC_LED3 BIT(2)
-#define PM8941_WLED_REG_SYNC_ALL 0x07
-#define PM8941_WLED_REG_SYNC_CLEAR 0x00
+#define WLED3_CTRL_REG_FREQ 0x4c
+#define WLED3_CTRL_REG_FREQ_MASK 0x0f

-#define PM8941_WLED_REG_FREQ 0x4c
-#define PM8941_WLED_REG_FREQ_MASK 0x0f
+#define WLED3_CTRL_REG_OVP 0x4d
+#define WLED3_CTRL_REG_OVP_MASK 0x03

-#define PM8941_WLED_REG_OVP 0x4d
-#define PM8941_WLED_REG_OVP_MASK 0x03
+#define WLED3_CTRL_REG_ILIMIT 0x4e
+#define WLED3_CTRL_REG_ILIMIT_MASK 0x07

-#define PM8941_WLED_REG_BOOST 0x4e
-#define PM8941_WLED_REG_BOOST_MASK 0x07
+/* WLED3 sink registers */
+#define WLED3_SINK_REG_SYNC 0x47
+#define WLED3_SINK_REG_SYNC_MASK 0x07
+#define WLED3_SINK_REG_SYNC_LED1 BIT(0)
+#define WLED3_SINK_REG_SYNC_LED2 BIT(1)
+#define WLED3_SINK_REG_SYNC_LED3 BIT(2)
+#define WLED3_SINK_REG_SYNC_ALL 0x07
+#define WLED3_SINK_REG_SYNC_CLEAR 0x00

-#define PM8941_WLED_REG_SINK 0x4f
-#define PM8941_WLED_REG_SINK_MASK 0xe0
-#define PM8941_WLED_REG_SINK_SHFT 0x05
+#define WLED3_SINK_REG_CURR_SINK 0x4f
+#define WLED3_SINK_REG_CURR_SINK_MASK 0xe0
+#define WLED3_SINK_REG_CURR_SINK_SHFT 0x05

-/* Per-'string' registers below */
-#define PM8941_WLED_REG_STR_OFFSET 0x10
+/* WLED3 per-'string' registers below */
+#define WLED3_SINK_REG_STR_OFFSET 0x10

-#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60
-#define PM8941_WLED_REG_STR_MOD_MASK BIT(7)
-#define PM8941_WLED_REG_STR_MOD_EN BIT(7)
+#define WLED3_SINK_REG_STR_MOD_EN_BASE 0x60
+#define WLED3_SINK_REG_STR_MOD_MASK BIT(7)
+#define WLED3_SINK_REG_STR_MOD_EN BIT(7)

-#define PM8941_WLED_REG_STR_SCALE_BASE 0x62
-#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f
+#define WLED3_SINK_REG_STR_FULL_SCALE_CURR 0x62
+#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK 0x1f

-#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63
-#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01
-#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00
-#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01
+#define WLED3_SINK_REG_STR_MOD_SRC_BASE 0x63
+#define WLED3_SINK_REG_STR_MOD_SRC_MASK 0x01
+#define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00
+#define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01

-#define PM8941_WLED_REG_STR_CABC_BASE 0x66
-#define PM8941_WLED_REG_STR_CABC_MASK BIT(7)
-#define PM8941_WLED_REG_STR_CABC_EN BIT(7)
+#define WLED3_SINK_REG_STR_CABC_BASE 0x66
+#define WLED3_SINK_REG_STR_CABC_MASK BIT(7)
+#define WLED3_SINK_REG_STR_CABC_EN BIT(7)

-struct pm8941_wled_config {
- u32 i_boost_limit;
+struct wled_config {
+ u32 boost_i_limit;
u32 ovp;
u32 switch_freq;
u32 num_strings;
- u32 i_limit;
+ u32 string_i_limit;
bool cs_out_en;
bool ext_gen;
bool cabc_en;
};

-struct pm8941_wled {
+struct wled {
const char *name;
struct regmap *regmap;
u16 addr;

- struct pm8941_wled_config cfg;
+ struct wled_config cfg;
};

-static int pm8941_wled_update_status(struct backlight_device *bl)
+static int wled_update_status(struct backlight_device *bl)
{
- struct pm8941_wled *wled = bl_get_data(bl);
+ struct wled *wled = bl_get_data(bl);
u16 val = bl->props.brightness;
u8 ctrl = 0;
int rc;
@@ -92,11 +94,11 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
val = 0;

if (val != 0)
- ctrl = PM8941_WLED_REG_MOD_EN_BIT;
+ ctrl = WLED3_CTRL_REG_MOD_EN_BIT;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_MOD_EN,
- PM8941_WLED_REG_MOD_EN_MASK, ctrl);
+ wled->addr + WLED3_CTRL_REG_MOD_EN,
+ WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
if (rc)
return rc;

@@ -104,89 +106,89 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
u8 v[2] = { val & 0xff, (val >> 8) & 0xf };

rc = regmap_bulk_write(wled->regmap,
- wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
+ wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
v, 2);
if (rc)
return rc;
}

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_SYNC,
- PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
+ wled->addr + WLED3_SINK_REG_SYNC,
+ WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
if (rc)
return rc;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_SYNC,
- PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
+ wled->addr + WLED3_SINK_REG_SYNC,
+ WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
return rc;
}

-static int pm8941_wled_setup(struct pm8941_wled *wled)
+static int wled_setup(struct wled *wled)
{
int rc;
int i;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_OVP,
- PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
+ wled->addr + WLED3_CTRL_REG_OVP,
+ WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
if (rc)
return rc;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_BOOST,
- PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
+ wled->addr + WLED3_CTRL_REG_ILIMIT,
+ WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
if (rc)
return rc;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_FREQ,
- PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
+ wled->addr + WLED3_CTRL_REG_FREQ,
+ WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
if (rc)
return rc;

if (wled->cfg.cs_out_en) {
u8 all = (BIT(wled->cfg.num_strings) - 1)
- << PM8941_WLED_REG_SINK_SHFT;
+ << WLED3_SINK_REG_CURR_SINK_SHFT;

rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_SINK,
- PM8941_WLED_REG_SINK_MASK, all);
+ wled->addr + WLED3_SINK_REG_CURR_SINK,
+ WLED3_SINK_REG_CURR_SINK_MASK, all);
if (rc)
return rc;
}

for (i = 0; i < wled->cfg.num_strings; ++i) {
- u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
+ u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;

rc = regmap_update_bits(wled->regmap,
- addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
- PM8941_WLED_REG_STR_MOD_MASK,
- PM8941_WLED_REG_STR_MOD_EN);
+ addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
+ WLED3_SINK_REG_STR_MOD_MASK,
+ WLED3_SINK_REG_STR_MOD_EN);
if (rc)
return rc;

if (wled->cfg.ext_gen) {
rc = regmap_update_bits(wled->regmap,
- addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
- PM8941_WLED_REG_STR_MOD_SRC_MASK,
- PM8941_WLED_REG_STR_MOD_SRC_EXT);
+ addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
+ WLED3_SINK_REG_STR_MOD_SRC_MASK,
+ WLED3_SINK_REG_STR_MOD_SRC_EXT);
if (rc)
return rc;
}

rc = regmap_update_bits(wled->regmap,
- addr + PM8941_WLED_REG_STR_SCALE_BASE,
- PM8941_WLED_REG_STR_SCALE_MASK,
- wled->cfg.i_limit);
+ addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
+ WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
+ wled->cfg.string_i_limit);
if (rc)
return rc;

rc = regmap_update_bits(wled->regmap,
- addr + PM8941_WLED_REG_STR_CABC_BASE,
- PM8941_WLED_REG_STR_CABC_MASK,
+ addr + WLED3_SINK_REG_STR_CABC_BASE,
+ WLED3_SINK_REG_STR_CABC_MASK,
wled->cfg.cabc_en ?
- PM8941_WLED_REG_STR_CABC_EN : 0);
+ WLED3_SINK_REG_STR_CABC_EN : 0);
if (rc)
return rc;
}
@@ -194,9 +196,9 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
return 0;
}

-static const struct pm8941_wled_config pm8941_wled_config_defaults = {
- .i_boost_limit = 3,
- .i_limit = 20,
+static const struct wled_config wled3_config_defaults = {
+ .boost_i_limit = 3,
+ .string_i_limit = 20,
.ovp = 2,
.switch_freq = 5,
.num_strings = 0,
@@ -205,55 +207,55 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
.cabc_en = false,
};

-struct pm8941_wled_var_cfg {
+struct wled_var_cfg {
const u32 *values;
u32 (*fn)(u32);
int size;
};

-static const u32 pm8941_wled_i_boost_limit_values[] = {
+static const u32 wled3_boost_i_limit_values[] = {
105, 385, 525, 805, 980, 1260, 1400, 1680,
};

-static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = {
- .values = pm8941_wled_i_boost_limit_values,
- .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
+static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
+ .values = wled3_boost_i_limit_values,
+ .size = ARRAY_SIZE(wled3_boost_i_limit_values),
};

-static const u32 pm8941_wled_ovp_values[] = {
+static const u32 wled3_ovp_values[] = {
35, 32, 29, 27,
};

-static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
- .values = pm8941_wled_ovp_values,
- .size = ARRAY_SIZE(pm8941_wled_ovp_values),
+static const struct wled_var_cfg wled3_ovp_cfg = {
+ .values = wled3_ovp_values,
+ .size = ARRAY_SIZE(wled3_ovp_values),
};

-static u32 pm8941_wled_num_strings_values_fn(u32 idx)
+static u32 wled3_num_strings_values_fn(u32 idx)
{
return idx + 1;
}

-static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = {
- .fn = pm8941_wled_num_strings_values_fn,
+static const struct wled_var_cfg wled3_num_strings_cfg = {
+ .fn = wled3_num_strings_values_fn,
.size = 3,
};

-static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
+static u32 wled3_switch_freq_values_fn(u32 idx)
{
return 19200 / (2 * (1 + idx));
}

-static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = {
- .fn = pm8941_wled_switch_freq_values_fn,
+static const struct wled_var_cfg wled3_switch_freq_cfg = {
+ .fn = wled3_switch_freq_values_fn,
.size = 16,
};

-static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
+static const struct wled_var_cfg wled3_string_i_limit_cfg = {
.size = 26,
};

-static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
+static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
{
if (idx >= cfg->size)
return UINT_MAX;
@@ -264,9 +266,9 @@ static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
return idx;
}

-static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
+static int wled_configure(struct wled *wled, struct device *dev)
{
- struct pm8941_wled_config *cfg = &wled->cfg;
+ struct wled_config *cfg = &wled->cfg;
u32 val;
int rc;
u32 c;
@@ -276,32 +278,32 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
const struct {
const char *name;
u32 *val_ptr;
- const struct pm8941_wled_var_cfg *cfg;
+ const struct wled_var_cfg *cfg;
} u32_opts[] = {
{
"qcom,current-boost-limit",
- &cfg->i_boost_limit,
- .cfg = &pm8941_wled_i_boost_limit_cfg,
+ &cfg->boost_i_limit,
+ .cfg = &wled3_boost_i_limit_cfg,
},
{
"qcom,current-limit",
- &cfg->i_limit,
- .cfg = &pm8941_wled_i_limit_cfg,
+ &cfg->string_i_limit,
+ .cfg = &wled3_string_i_limit_cfg,
},
{
"qcom,ovp",
&cfg->ovp,
- .cfg = &pm8941_wled_ovp_cfg,
+ .cfg = &wled3_ovp_cfg,
},
{
"qcom,switching-freq",
&cfg->switch_freq,
- .cfg = &pm8941_wled_switch_freq_cfg,
+ .cfg = &wled3_switch_freq_cfg,
},
{
"qcom,num-strings",
&cfg->num_strings,
- .cfg = &pm8941_wled_num_strings_cfg,
+ .cfg = &wled3_num_strings_cfg,
},
};
const struct {
@@ -324,7 +326,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
if (rc)
wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);

- *cfg = pm8941_wled_config_defaults;
+ *cfg = wled3_config_defaults;
for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
if (rc == -EINVAL) {
@@ -336,7 +338,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)

c = UINT_MAX;
for (j = 0; c != val; j++) {
- c = pm8941_wled_values(u32_opts[i].cfg, j);
+ c = wled3_values(u32_opts[i].cfg, j);
if (c == UINT_MAX) {
dev_err(dev, "invalid value for '%s'\n",
u32_opts[i].name);
@@ -358,15 +360,15 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
return 0;
}

-static const struct backlight_ops pm8941_wled_ops = {
- .update_status = pm8941_wled_update_status,
+static const struct backlight_ops wled_ops = {
+ .update_status = wled_update_status,
};

-static int pm8941_wled_probe(struct platform_device *pdev)
+static int wled_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bl;
- struct pm8941_wled *wled;
+ struct wled *wled;
struct regmap *regmap;
u32 val;
int rc;
@@ -383,42 +385,42 @@ static int pm8941_wled_probe(struct platform_device *pdev)

wled->regmap = regmap;

- rc = pm8941_wled_configure(wled, &pdev->dev);
+ rc = wled_configure(wled, &pdev->dev);
if (rc)
return rc;

- rc = pm8941_wled_setup(wled);
+ rc = wled_setup(wled);
if (rc)
return rc;

- val = PM8941_WLED_DEFAULT_BRIGHTNESS;
+ val = WLED_DEFAULT_BRIGHTNESS;
of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);

memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.brightness = val;
- props.max_brightness = PM8941_WLED_REG_VAL_MAX;
+ props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
bl = devm_backlight_device_register(&pdev->dev, wled->name,
&pdev->dev, wled,
- &pm8941_wled_ops, &props);
+ &wled_ops, &props);
return PTR_ERR_OR_ZERO(bl);
};

-static const struct of_device_id pm8941_wled_match_table[] = {
+static const struct of_device_id wled_match_table[] = {
{ .compatible = "qcom,pm8941-wled" },
{}
};
-MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
+MODULE_DEVICE_TABLE(of, wled_match_table);

-static struct platform_driver pm8941_wled_driver = {
- .probe = pm8941_wled_probe,
+static struct platform_driver wled_driver = {
+ .probe = wled_probe,
.driver = {
- .name = "pm8941-wled",
- .of_match_table = pm8941_wled_match_table,
+ .name = "qcom,wled",
+ .of_match_table = wled_match_table,
},
};

-module_platform_driver(pm8941_wled_driver);
+module_platform_driver(wled_driver);

-MODULE_DESCRIPTION("pm8941 wled driver");
+MODULE_DESCRIPTION("Qualcomm WLED driver");
MODULE_LICENSE("GPL v2");