diff options
Diffstat (limited to 'drivers/video/backlight/pm8941-wled.c')
| -rw-r--r-- | drivers/video/backlight/pm8941-wled.c | 424 |
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"); |