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backlight: qcom-wled: Restructure the driver for WLED3

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Restructure the driver to add the support for new WLED
peripherals.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Kiran Gunda 2019-11-01 11:57:01 +05:30 committed by Lee Jones
parent bb800a3715
commit 775d2ffb4a
1 changed files with 235 additions and 140 deletions
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375
drivers/video/backlight/qcom-wled.c
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@ -7,59 +7,71 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
/* From DT binding */
#define WLED_MAX_STRINGS 4
#define WLED_DEFAULT_BRIGHTNESS 2048
#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF
#define WLED3_CTRL_REG_VAL_BASE 0x40
/* 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 WLED3_CTRL_REG_MOD_EN_SHIFT 7
#define WLED3_CTRL_REG_FREQ 0x4c
#define WLED3_CTRL_REG_FREQ_MASK 0x0f
#define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0)
#define WLED3_CTRL_REG_OVP 0x4d
#define WLED3_CTRL_REG_OVP_MASK 0x03
#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)
#define WLED3_CTRL_REG_ILIMIT 0x4e
#define WLED3_CTRL_REG_ILIMIT_MASK 0x07
#define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)
/* 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 WLED3_SINK_REG_CURR_SINK 0x4f
#define WLED3_SINK_REG_CURR_SINK_MASK 0xe0
#define WLED3_SINK_REG_CURR_SINK_SHFT 0x05
#define WLED3_SINK_REG_CURR_SINK_MASK GENMASK(7, 5)
#define WLED3_SINK_REG_CURR_SINK_SHFT 5
/* WLED3 per-'string' registers below */
#define WLED3_SINK_REG_STR_OFFSET 0x10
/* WLED3 specific per-'string' registers below */
#define WLED3_SINK_REG_BRIGHT(n) (0x40 + n)
#define WLED3_SINK_REG_STR_MOD_EN_BASE 0x60
#define WLED3_SINK_REG_STR_MOD_EN(n) (0x60 + (n * 0x10))
#define WLED3_SINK_REG_STR_MOD_MASK BIT(7)
#define WLED3_SINK_REG_STR_MOD_EN BIT(7)
#define WLED3_SINK_REG_STR_FULL_SCALE_CURR 0x62
#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK 0x1f
#define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n) (0x62 + (n * 0x10))
#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(4, 0)
#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(n) (0x63 + (n * 0x10))
#define WLED3_SINK_REG_STR_MOD_SRC_MASK BIT(0)
#define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00
#define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01
#define WLED3_SINK_REG_STR_CABC_BASE 0x66
#define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10))
#define WLED3_SINK_REG_STR_CABC_MASK BIT(7)
#define WLED3_SINK_REG_STR_CABC_EN BIT(7)
struct wled_var_cfg {
const u32 *values;
u32 (*fn)(u32);
int size;
};
struct wled_u32_opts {
const char *name;
u32 *val_ptr;
const struct wled_var_cfg *cfg;
};
struct wled_bool_opts {
const char *name;
bool *val_ptr;
};
struct wled_config {
u32 boost_i_limit;
@ -67,132 +79,179 @@ struct wled_config {
u32 switch_freq;
u32 num_strings;
u32 string_i_limit;
u32 enabled_strings[WLED_MAX_STRINGS];
bool cs_out_en;
bool ext_gen;
bool cabc_en;
bool cabc;
};
struct wled {
const char *name;
struct device *dev;
struct regmap *regmap;
u16 addr;
u16 ctrl_addr;
u16 max_string_count;
u32 brightness;
u32 max_brightness;
struct wled_config cfg;
int (*wled_set_brightness)(struct wled *wled, u16 brightness);
};
static int wled3_set_brightness(struct wled *wled, u16 brightness)
{
int rc, i;
u8 v[2];
v[0] = brightness & 0xff;
v[1] = (brightness >> 8) & 0xf;
for (i = 0; i < wled->cfg.num_strings; ++i) {
rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
WLED3_SINK_REG_BRIGHT(i), v, 2);
if (rc < 0)
return rc;
}
return 0;
}
static int wled_module_enable(struct wled *wled, int val)
{
int rc;
rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
WLED3_CTRL_REG_MOD_EN,
WLED3_CTRL_REG_MOD_EN_MASK,
val << WLED3_CTRL_REG_MOD_EN_SHIFT);
return rc;
}
static int wled_sync_toggle(struct wled *wled)
{
int rc;
unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_SINK_REG_SYNC,
mask, mask);
if (rc < 0)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_SINK_REG_SYNC,
mask, WLED3_SINK_REG_SYNC_CLEAR);
return rc;
}
static int wled_update_status(struct backlight_device *bl)
{
struct wled *wled = bl_get_data(bl);
u16 val = bl->props.brightness;
u8 ctrl = 0;
int rc;
int i;
u16 brightness = bl->props.brightness;
int rc = 0;
if (bl->props.power != FB_BLANK_UNBLANK ||
bl->props.fb_blank != FB_BLANK_UNBLANK ||
bl->props.state & BL_CORE_FBBLANK)
val = 0;
brightness = 0;
if (val != 0)
ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
rc = regmap_update_bits(wled->regmap,
wled->addr + WLED3_CTRL_REG_MOD_EN,
WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
if (rc)
return rc;
for (i = 0; i < wled->cfg.num_strings; ++i) {
u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
rc = regmap_bulk_write(wled->regmap,
wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
v, 2);
if (rc)
if (brightness) {
rc = wled->wled_set_brightness(wled, brightness);
if (rc < 0) {
dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
rc);
return rc;
}
rc = wled_sync_toggle(wled);
if (rc < 0) {
dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
return rc;
}
}
rc = regmap_update_bits(wled->regmap,
wled->addr + WLED3_SINK_REG_SYNC,
WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
if (rc)
return rc;
if (!!brightness != !!wled->brightness) {
rc = wled_module_enable(wled, !!brightness);
if (rc < 0) {
dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
return rc;
}
}
wled->brightness = brightness;
rc = regmap_update_bits(wled->regmap,
wled->addr + WLED3_SINK_REG_SYNC,
WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
return rc;
}
static int wled_setup(struct wled *wled)
static int wled3_setup(struct wled *wled)
{
int rc;
int i;
u16 addr;
u8 sink_en = 0;
int rc, i, j;
rc = regmap_update_bits(wled->regmap,
wled->addr + WLED3_CTRL_REG_OVP,
WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
wled->ctrl_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 + WLED3_CTRL_REG_ILIMIT,
WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
wled->ctrl_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 + WLED3_CTRL_REG_FREQ,
WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
wled->ctrl_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)
<< WLED3_SINK_REG_CURR_SINK_SHFT;
rc = regmap_update_bits(wled->regmap,
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 + WLED3_SINK_REG_STR_OFFSET * i;
rc = regmap_update_bits(wled->regmap,
addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
WLED3_SINK_REG_STR_MOD_MASK,
WLED3_SINK_REG_STR_MOD_EN);
j = wled->cfg.enabled_strings[i];
addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
rc = regmap_update_bits(wled->regmap, addr,
WLED3_SINK_REG_STR_MOD_MASK,
WLED3_SINK_REG_STR_MOD_MASK);
if (rc)
return rc;
if (wled->cfg.ext_gen) {
rc = regmap_update_bits(wled->regmap,
addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
WLED3_SINK_REG_STR_MOD_SRC_MASK,
WLED3_SINK_REG_STR_MOD_SRC_EXT);
addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
rc = regmap_update_bits(wled->regmap, addr,
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 + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
wled->cfg.string_i_limit);
addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
rc = regmap_update_bits(wled->regmap, addr,
WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
wled->cfg.string_i_limit);
if (rc)
return rc;
rc = regmap_update_bits(wled->regmap,
addr + WLED3_SINK_REG_STR_CABC_BASE,
WLED3_SINK_REG_STR_CABC_MASK,
wled->cfg.cabc_en ?
WLED3_SINK_REG_STR_CABC_EN : 0);
addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
rc = regmap_update_bits(wled->regmap, addr,
WLED3_SINK_REG_STR_CABC_MASK,
wled->cfg.cabc ?
WLED3_SINK_REG_STR_CABC_MASK : 0);
if (rc)
return rc;
sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
}
rc = regmap_update_bits(wled->regmap,
wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
if (rc)
return rc;
return 0;
}
@ -200,17 +259,12 @@ static const struct wled_config wled3_config_defaults = {
.boost_i_limit = 3,
.string_i_limit = 20,
.ovp = 2,
.num_strings = 3,
.switch_freq = 5,
.num_strings = 0,
.cs_out_en = false,
.ext_gen = false,
.cabc_en = false,
};
struct wled_var_cfg {
const u32 *values;
u32 (*fn)(u32);
int size;
.cabc = false,
.enabled_strings = {0, 1, 2, 3},
};
static const u32 wled3_boost_i_limit_values[] = {
@ -255,7 +309,11 @@ static const struct wled_var_cfg wled3_string_i_limit_cfg = {
.size = 26,
};
static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
static const struct wled_var_cfg wled3_string_cfg = {
.size = 8,
};
static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
{
if (idx >= cfg->size)
return UINT_MAX;
@ -266,68 +324,75 @@ static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
return idx;
}
static int wled_configure(struct wled *wled, struct device *dev)
static int wled_configure(struct wled *wled, int version)
{
struct wled_config *cfg = &wled->cfg;
u32 val;
int rc;
u32 c;
int i;
int j;
struct device *dev = wled->dev;
const __be32 *prop_addr;
u32 size, val, c, string_len;
int rc, i, j;
const struct {
const char *name;
u32 *val_ptr;
const struct wled_var_cfg *cfg;
} u32_opts[] = {
const struct wled_u32_opts *u32_opts = NULL;
const struct wled_u32_opts wled3_opts[] = {
{
"qcom,current-boost-limit",
&cfg->boost_i_limit,
.name = "qcom,current-boost-limit",
.val_ptr = &cfg->boost_i_limit,
.cfg = &wled3_boost_i_limit_cfg,
},
{
"qcom,current-limit",
&cfg->string_i_limit,
.name = "qcom,current-limit",
.val_ptr = &cfg->string_i_limit,
.cfg = &wled3_string_i_limit_cfg,
},
{
"qcom,ovp",
&cfg->ovp,
.name = "qcom,ovp",
.val_ptr = &cfg->ovp,
.cfg = &wled3_ovp_cfg,
},
{
"qcom,switching-freq",
&cfg->switch_freq,
.name = "qcom,switching-freq",
.val_ptr = &cfg->switch_freq,
.cfg = &wled3_switch_freq_cfg,
},
{
"qcom,num-strings",
&cfg->num_strings,
.name = "qcom,num-strings",
.val_ptr = &cfg->num_strings,
.cfg = &wled3_num_strings_cfg,
},
};
const struct {
const char *name;
bool *val_ptr;
} bool_opts[] = {
const struct wled_bool_opts bool_opts[] = {
{ "qcom,cs-out", &cfg->cs_out_en, },
{ "qcom,ext-gen", &cfg->ext_gen, },
{ "qcom,cabc", &cfg->cabc_en, },
{ "qcom,cabc", &cfg->cabc, },
};
rc = of_property_read_u32(dev->of_node, "reg", &val);
if (rc || val > 0xffff) {
dev_err(dev, "invalid IO resources\n");
return rc ? rc : -EINVAL;
prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
if (!prop_addr) {
dev_err(wled->dev, "invalid IO resources\n");
return -EINVAL;
}
wled->addr = val;
wled->ctrl_addr = be32_to_cpu(*prop_addr);
rc = of_property_read_string(dev->of_node, "label", &wled->name);
if (rc)
wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
*cfg = wled3_config_defaults;
for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
switch (version) {
case 3:
u32_opts = wled3_opts;
size = ARRAY_SIZE(wled3_opts);
*cfg = wled3_config_defaults;
wled->wled_set_brightness = wled3_set_brightness;
wled->max_string_count = 3;
break;
default:
dev_err(wled->dev, "Invalid WLED version\n");
return -EINVAL;
}
for (i = 0; i < size; ++i) {
rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
if (rc == -EINVAL) {
continue;
@ -338,12 +403,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
c = UINT_MAX;
for (j = 0; c != val; j++) {
c = wled3_values(u32_opts[i].cfg, j);
c = wled_values(u32_opts[i].cfg, j);
if (c == UINT_MAX) {
dev_err(dev, "invalid value for '%s'\n",
u32_opts[i].name);
return -EINVAL;
}
if (c == val)
break;
}
dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
@ -357,6 +425,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
cfg->num_strings = cfg->num_strings + 1;
string_len = of_property_count_elems_of_size(dev->of_node,
"qcom,enabled-strings",
sizeof(u32));
if (string_len > 0)
of_property_read_u32_array(dev->of_node,
"qcom,enabled-strings",
wled->cfg.enabled_strings,
sizeof(u32));
return 0;
}
@ -370,6 +447,7 @@ static int wled_probe(struct platform_device *pdev)
struct backlight_device *bl;
struct wled *wled;
struct regmap *regmap;
int version;
u32 val;
int rc;
@ -384,14 +462,31 @@ static int wled_probe(struct platform_device *pdev)
return -ENOMEM;
wled->regmap = regmap;
wled->dev = &pdev->dev;
rc = wled_configure(wled, &pdev->dev);
version = (uintptr_t)of_device_get_match_data(&pdev->dev);
if (!version) {
dev_err(&pdev->dev, "Unknown device version\n");
return -ENODEV;
}
rc = wled_configure(wled, version);
if (rc)
return rc;
rc = wled_setup(wled);
if (rc)
return rc;
switch (version) {
case 3:
rc = wled3_setup(wled);
if (rc) {
dev_err(&pdev->dev, "wled3_setup failed\n");
return rc;
}
break;
default:
dev_err(wled->dev, "Invalid WLED version\n");
break;
}
val = WLED_DEFAULT_BRIGHTNESS;
of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
@ -407,7 +502,7 @@ static int wled_probe(struct platform_device *pdev)
};
static const struct of_device_id wled_match_table[] = {
{ .compatible = "qcom,pm8941-wled" },
{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
{}
};
MODULE_DEVICE_TABLE(of, wled_match_table);