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path: root/drivers/video/backlight/pm8941-wled.c
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Diffstat (limited to 'drivers/video/backlight/pm8941-wled.c')
-rw-r--r--drivers/video/backlight/pm8941-wled.c424
1 files changed, 0 insertions, 424 deletions
diff --git a/drivers/video/backlight/pm8941-wled.c b/drivers/video/backlight/pm8941-wled.c
deleted file mode 100644
index 82b85725a22a..000000000000
--- a/drivers/video/backlight/pm8941-wled.c
+++ /dev/null
@@ -1,424 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2015, Sony Mobile Communications, AB.
- */
-
-#include <linux/kernel.h>
-#include <linux/backlight.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/regmap.h>
-
-/* From DT binding */
-#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048
-
-#define PM8941_WLED_REG_VAL_BASE 0x40
-#define PM8941_WLED_REG_VAL_MAX 0xFFF
-
-#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)
-
-#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 PM8941_WLED_REG_FREQ 0x4c
-#define PM8941_WLED_REG_FREQ_MASK 0x0f
-
-#define PM8941_WLED_REG_OVP 0x4d
-#define PM8941_WLED_REG_OVP_MASK 0x03
-
-#define PM8941_WLED_REG_BOOST 0x4e
-#define PM8941_WLED_REG_BOOST_MASK 0x07
-
-#define PM8941_WLED_REG_SINK 0x4f
-#define PM8941_WLED_REG_SINK_MASK 0xe0
-#define PM8941_WLED_REG_SINK_SHFT 0x05
-
-/* Per-'string' registers below */
-#define PM8941_WLED_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 PM8941_WLED_REG_STR_SCALE_BASE 0x62
-#define PM8941_WLED_REG_STR_SCALE_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 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)
-
-struct pm8941_wled_config {
- u32 i_boost_limit;
- u32 ovp;
- u32 switch_freq;
- u32 num_strings;
- u32 i_limit;
- bool cs_out_en;
- bool ext_gen;
- bool cabc_en;
-};
-
-struct pm8941_wled {
- const char *name;
- struct regmap *regmap;
- u16 addr;
-
- struct pm8941_wled_config cfg;
-};
-
-static int pm8941_wled_update_status(struct backlight_device *bl)
-{
- struct pm8941_wled *wled = bl_get_data(bl);
- u16 val = bl->props.brightness;
- u8 ctrl = 0;
- int rc;
- int i;
-
- if (bl->props.power != FB_BLANK_UNBLANK ||
- bl->props.fb_blank != FB_BLANK_UNBLANK ||
- bl->props.state & BL_CORE_FBBLANK)
- val = 0;
-
- if (val != 0)
- ctrl = PM8941_WLED_REG_MOD_EN_BIT;
-
- rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_MOD_EN,
- PM8941_WLED_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 + PM8941_WLED_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);
- 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);
- return rc;
-}
-
-static int pm8941_wled_setup(struct pm8941_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);
- 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);
- 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);
- if (rc)
- return rc;
-
- if (wled->cfg.cs_out_en) {
- u8 all = (BIT(wled->cfg.num_strings) - 1)
- << PM8941_WLED_REG_SINK_SHFT;
-
- rc = regmap_update_bits(wled->regmap,
- wled->addr + PM8941_WLED_REG_SINK,
- PM8941_WLED_REG_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;
-
- 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);
- 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);
- 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);
- if (rc)
- return rc;
-
- rc = regmap_update_bits(wled->regmap,
- addr + PM8941_WLED_REG_STR_CABC_BASE,
- PM8941_WLED_REG_STR_CABC_MASK,
- wled->cfg.cabc_en ?
- PM8941_WLED_REG_STR_CABC_EN : 0);
- if (rc)
- return rc;
- }
-
- return 0;
-}
-
-static const struct pm8941_wled_config pm8941_wled_config_defaults = {
- .i_boost_limit = 3,
- .i_limit = 20,
- .ovp = 2,
- .switch_freq = 5,
- .num_strings = 0,
- .cs_out_en = false,
- .ext_gen = false,
- .cabc_en = false,
-};
-
-struct pm8941_wled_var_cfg {
- const u32 *values;
- u32 (*fn)(u32);
- int size;
-};
-
-static const u32 pm8941_wled_i_boost_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 u32 pm8941_wled_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 u32 pm8941_wled_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,
- .size = 3,
-};
-
-static u32 pm8941_wled_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,
- .size = 16,
-};
-
-static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
- .size = 26,
-};
-
-static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
-{
- if (idx >= cfg->size)
- return UINT_MAX;
- if (cfg->fn)
- return cfg->fn(idx);
- if (cfg->values)
- return cfg->values[idx];
- return idx;
-}
-
-static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
-{
- struct pm8941_wled_config *cfg = &wled->cfg;
- u32 val;
- int rc;
- u32 c;
- int i;
- int j;
-
- const struct {
- const char *name;
- u32 *val_ptr;
- const struct pm8941_wled_var_cfg *cfg;
- } u32_opts[] = {
- {
- "qcom,current-boost-limit",
- &cfg->i_boost_limit,
- .cfg = &pm8941_wled_i_boost_limit_cfg,
- },
- {
- "qcom,current-limit",
- &cfg->i_limit,
- .cfg = &pm8941_wled_i_limit_cfg,
- },
- {
- "qcom,ovp",
- &cfg->ovp,
- .cfg = &pm8941_wled_ovp_cfg,
- },
- {
- "qcom,switching-freq",
- &cfg->switch_freq,
- .cfg = &pm8941_wled_switch_freq_cfg,
- },
- {
- "qcom,num-strings",
- &cfg->num_strings,
- .cfg = &pm8941_wled_num_strings_cfg,
- },
- };
- const struct {
- const char *name;
- bool *val_ptr;
- } bool_opts[] = {
- { "qcom,cs-out", &cfg->cs_out_en, },
- { "qcom,ext-gen", &cfg->ext_gen, },
- { "qcom,cabc", &cfg->cabc_en, },
- };
-
- 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;
- }
- wled->addr = val;
-
- 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 = pm8941_wled_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) {
- continue;
- } else if (rc) {
- dev_err(dev, "error reading '%s'\n", u32_opts[i].name);
- return rc;
- }
-
- c = UINT_MAX;
- for (j = 0; c != val; j++) {
- c = pm8941_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;
- }
- }
-
- dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
- *u32_opts[i].val_ptr = j;
- }
-
- for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) {
- if (of_property_read_bool(dev->of_node, bool_opts[i].name))
- *bool_opts[i].val_ptr = true;
- }
-
- cfg->num_strings = cfg->num_strings + 1;
-
- return 0;
-}
-
-static const struct backlight_ops pm8941_wled_ops = {
- .update_status = pm8941_wled_update_status,
-};
-
-static int pm8941_wled_probe(struct platform_device *pdev)
-{
- struct backlight_properties props;
- struct backlight_device *bl;
- struct pm8941_wled *wled;
- struct regmap *regmap;
- u32 val;
- int rc;
-
- regmap = dev_get_regmap(pdev->dev.parent, NULL);
- if (!regmap) {
- dev_err(&pdev->dev, "Unable to get regmap\n");
- return -EINVAL;
- }
-
- wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL);
- if (!wled)
- return -ENOMEM;
-
- wled->regmap = regmap;
-
- rc = pm8941_wled_configure(wled, &pdev->dev);
- if (rc)
- return rc;
-
- rc = pm8941_wled_setup(wled);
- if (rc)
- return rc;
-
- val = PM8941_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;
- bl = devm_backlight_device_register(&pdev->dev, wled->name,
- &pdev->dev, wled,
- &pm8941_wled_ops, &props);
- return PTR_ERR_OR_ZERO(bl);
-};
-
-static const struct of_device_id pm8941_wled_match_table[] = {
- { .compatible = "qcom,pm8941-wled" },
- {}
-};
-MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
-
-static struct platform_driver pm8941_wled_driver = {
- .probe = pm8941_wled_probe,
- .driver = {
- .name = "pm8941-wled",
- .of_match_table = pm8941_wled_match_table,
- },
-};
-
-module_platform_driver(pm8941_wled_driver);
-
-MODULE_DESCRIPTION("pm8941 wled driver");
-MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 00:42:31 +0300