backlight: qcom-wled: Restructure the driver for WLED3
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
Lee Jones
parent
bb800a3715
commit
775d2ffb4a
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@ -7,59 +7,71 @@
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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/* From DT binding */
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#define WLED_MAX_STRINGS 4
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#define WLED_DEFAULT_BRIGHTNESS 2048
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#define WLED3_SINK_REG_BRIGHT_MAX 0xFFF
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#define WLED3_CTRL_REG_VAL_BASE 0x40
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/* WLED3 control registers */
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#define WLED3_CTRL_REG_MOD_EN 0x46
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#define WLED3_CTRL_REG_MOD_EN_BIT BIT(7)
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#define WLED3_CTRL_REG_MOD_EN_MASK BIT(7)
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#define WLED3_CTRL_REG_MOD_EN_SHIFT 7
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#define WLED3_CTRL_REG_FREQ 0x4c
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#define WLED3_CTRL_REG_FREQ_MASK 0x0f
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#define WLED3_CTRL_REG_FREQ_MASK GENMASK(3, 0)
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#define WLED3_CTRL_REG_OVP 0x4d
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#define WLED3_CTRL_REG_OVP_MASK 0x03
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#define WLED3_CTRL_REG_OVP_MASK GENMASK(1, 0)
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#define WLED3_CTRL_REG_ILIMIT 0x4e
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#define WLED3_CTRL_REG_ILIMIT_MASK 0x07
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#define WLED3_CTRL_REG_ILIMIT_MASK GENMASK(2, 0)
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/* WLED3 sink registers */
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#define WLED3_SINK_REG_SYNC 0x47
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#define WLED3_SINK_REG_SYNC_MASK 0x07
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#define WLED3_SINK_REG_SYNC_LED1 BIT(0)
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#define WLED3_SINK_REG_SYNC_LED2 BIT(1)
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#define WLED3_SINK_REG_SYNC_LED3 BIT(2)
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#define WLED3_SINK_REG_SYNC_ALL 0x07
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#define WLED3_SINK_REG_SYNC_CLEAR 0x00
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#define WLED3_SINK_REG_CURR_SINK 0x4f
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#define WLED3_SINK_REG_CURR_SINK_MASK 0xe0
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#define WLED3_SINK_REG_CURR_SINK_SHFT 0x05
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#define WLED3_SINK_REG_CURR_SINK_MASK GENMASK(7, 5)
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#define WLED3_SINK_REG_CURR_SINK_SHFT 5
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/* WLED3 per-'string' registers below */
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#define WLED3_SINK_REG_STR_OFFSET 0x10
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/* WLED3 specific per-'string' registers below */
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#define WLED3_SINK_REG_BRIGHT(n) (0x40 + n)
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#define WLED3_SINK_REG_STR_MOD_EN_BASE 0x60
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#define WLED3_SINK_REG_STR_MOD_EN(n) (0x60 + (n * 0x10))
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#define WLED3_SINK_REG_STR_MOD_MASK BIT(7)
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#define WLED3_SINK_REG_STR_MOD_EN BIT(7)
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#define WLED3_SINK_REG_STR_FULL_SCALE_CURR 0x62
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#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK 0x1f
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#define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n) (0x62 + (n * 0x10))
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#define WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK GENMASK(4, 0)
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#define WLED3_SINK_REG_STR_MOD_SRC_BASE 0x63
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#define WLED3_SINK_REG_STR_MOD_SRC_MASK 0x01
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#define WLED3_SINK_REG_STR_MOD_SRC(n) (0x63 + (n * 0x10))
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#define WLED3_SINK_REG_STR_MOD_SRC_MASK BIT(0)
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#define WLED3_SINK_REG_STR_MOD_SRC_INT 0x00
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#define WLED3_SINK_REG_STR_MOD_SRC_EXT 0x01
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#define WLED3_SINK_REG_STR_CABC_BASE 0x66
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#define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10))
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#define WLED3_SINK_REG_STR_CABC_MASK BIT(7)
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#define WLED3_SINK_REG_STR_CABC_EN BIT(7)
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struct wled_var_cfg {
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const u32 *values;
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u32 (*fn)(u32);
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int size;
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};
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struct wled_u32_opts {
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const char *name;
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u32 *val_ptr;
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const struct wled_var_cfg *cfg;
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};
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struct wled_bool_opts {
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const char *name;
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bool *val_ptr;
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};
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struct wled_config {
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u32 boost_i_limit;
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@ -67,132 +79,179 @@ struct wled_config {
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u32 switch_freq;
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u32 num_strings;
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u32 string_i_limit;
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u32 enabled_strings[WLED_MAX_STRINGS];
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bool cs_out_en;
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bool ext_gen;
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bool cabc_en;
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bool cabc;
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};
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struct wled {
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const char *name;
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struct device *dev;
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struct regmap *regmap;
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u16 addr;
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u16 ctrl_addr;
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u16 max_string_count;
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u32 brightness;
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u32 max_brightness;
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struct wled_config cfg;
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int (*wled_set_brightness)(struct wled *wled, u16 brightness);
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};
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static int wled3_set_brightness(struct wled *wled, u16 brightness)
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{
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int rc, i;
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u8 v[2];
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v[0] = brightness & 0xff;
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v[1] = (brightness >> 8) & 0xf;
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for (i = 0; i < wled->cfg.num_strings; ++i) {
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rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
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WLED3_SINK_REG_BRIGHT(i), v, 2);
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if (rc < 0)
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return rc;
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}
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return 0;
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}
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static int wled_module_enable(struct wled *wled, int val)
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{
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int rc;
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rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
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WLED3_CTRL_REG_MOD_EN,
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WLED3_CTRL_REG_MOD_EN_MASK,
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val << WLED3_CTRL_REG_MOD_EN_SHIFT);
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return rc;
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}
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static int wled_sync_toggle(struct wled *wled)
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{
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int rc;
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unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
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rc = regmap_update_bits(wled->regmap,
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wled->ctrl_addr + WLED3_SINK_REG_SYNC,
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mask, mask);
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if (rc < 0)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->ctrl_addr + WLED3_SINK_REG_SYNC,
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mask, WLED3_SINK_REG_SYNC_CLEAR);
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return rc;
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}
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static int wled_update_status(struct backlight_device *bl)
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{
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struct wled *wled = bl_get_data(bl);
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u16 val = bl->props.brightness;
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u8 ctrl = 0;
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int rc;
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int i;
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u16 brightness = bl->props.brightness;
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int rc = 0;
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if (bl->props.power != FB_BLANK_UNBLANK ||
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bl->props.fb_blank != FB_BLANK_UNBLANK ||
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bl->props.state & BL_CORE_FBBLANK)
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val = 0;
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brightness = 0;
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if (val != 0)
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ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_CTRL_REG_MOD_EN,
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WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
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if (rc)
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return rc;
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for (i = 0; i < wled->cfg.num_strings; ++i) {
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u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
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rc = regmap_bulk_write(wled->regmap,
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wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
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v, 2);
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if (rc)
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if (brightness) {
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rc = wled->wled_set_brightness(wled, brightness);
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if (rc < 0) {
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dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
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rc);
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return rc;
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}
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_SINK_REG_SYNC,
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WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
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if (rc)
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rc = wled_sync_toggle(wled);
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if (rc < 0) {
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dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
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return rc;
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}
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}
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if (!!brightness != !!wled->brightness) {
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rc = wled_module_enable(wled, !!brightness);
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if (rc < 0) {
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dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
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return rc;
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}
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}
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wled->brightness = brightness;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_SINK_REG_SYNC,
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WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
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return rc;
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}
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static int wled_setup(struct wled *wled)
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static int wled3_setup(struct wled *wled)
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{
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int rc;
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int i;
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u16 addr;
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u8 sink_en = 0;
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int rc, i, j;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_CTRL_REG_OVP,
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wled->ctrl_addr + WLED3_CTRL_REG_OVP,
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WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_CTRL_REG_ILIMIT,
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WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
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wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
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WLED3_CTRL_REG_ILIMIT_MASK,
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wled->cfg.boost_i_limit);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_CTRL_REG_FREQ,
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WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
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wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
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WLED3_CTRL_REG_FREQ_MASK,
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wled->cfg.switch_freq);
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if (rc)
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return rc;
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if (wled->cfg.cs_out_en) {
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u8 all = (BIT(wled->cfg.num_strings) - 1)
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<< WLED3_SINK_REG_CURR_SINK_SHFT;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + WLED3_SINK_REG_CURR_SINK,
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WLED3_SINK_REG_CURR_SINK_MASK, all);
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if (rc)
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return rc;
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}
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for (i = 0; i < wled->cfg.num_strings; ++i) {
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u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
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rc = regmap_update_bits(wled->regmap,
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addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
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j = wled->cfg.enabled_strings[i];
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addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
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rc = regmap_update_bits(wled->regmap, addr,
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WLED3_SINK_REG_STR_MOD_MASK,
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WLED3_SINK_REG_STR_MOD_EN);
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WLED3_SINK_REG_STR_MOD_MASK);
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if (rc)
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return rc;
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if (wled->cfg.ext_gen) {
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rc = regmap_update_bits(wled->regmap,
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addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
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addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
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rc = regmap_update_bits(wled->regmap, addr,
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WLED3_SINK_REG_STR_MOD_SRC_MASK,
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WLED3_SINK_REG_STR_MOD_SRC_EXT);
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if (rc)
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return rc;
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}
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rc = regmap_update_bits(wled->regmap,
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addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
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addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
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rc = regmap_update_bits(wled->regmap, addr,
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WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
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wled->cfg.string_i_limit);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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addr + WLED3_SINK_REG_STR_CABC_BASE,
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addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
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rc = regmap_update_bits(wled->regmap, addr,
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WLED3_SINK_REG_STR_CABC_MASK,
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wled->cfg.cabc_en ?
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WLED3_SINK_REG_STR_CABC_EN : 0);
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wled->cfg.cabc ?
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WLED3_SINK_REG_STR_CABC_MASK : 0);
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if (rc)
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return rc;
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sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
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}
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rc = regmap_update_bits(wled->regmap,
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wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
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WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
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if (rc)
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return rc;
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return 0;
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}
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@ -200,17 +259,12 @@ static const struct wled_config wled3_config_defaults = {
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.boost_i_limit = 3,
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.string_i_limit = 20,
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.ovp = 2,
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.num_strings = 3,
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.switch_freq = 5,
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.num_strings = 0,
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.cs_out_en = false,
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.ext_gen = false,
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.cabc_en = false,
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};
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struct wled_var_cfg {
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const u32 *values;
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u32 (*fn)(u32);
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int size;
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.cabc = false,
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.enabled_strings = {0, 1, 2, 3},
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};
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static const u32 wled3_boost_i_limit_values[] = {
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@ -255,7 +309,11 @@ static const struct wled_var_cfg wled3_string_i_limit_cfg = {
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.size = 26,
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};
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static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
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static const struct wled_var_cfg wled3_string_cfg = {
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.size = 8,
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};
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static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
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{
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if (idx >= cfg->size)
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return UINT_MAX;
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@ -266,68 +324,75 @@ static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
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return idx;
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}
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static int wled_configure(struct wled *wled, struct device *dev)
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static int wled_configure(struct wled *wled, int version)
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{
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struct wled_config *cfg = &wled->cfg;
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u32 val;
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int rc;
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u32 c;
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int i;
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int j;
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struct device *dev = wled->dev;
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const __be32 *prop_addr;
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u32 size, val, c, string_len;
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int rc, i, j;
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const struct {
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const char *name;
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u32 *val_ptr;
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const struct wled_var_cfg *cfg;
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} u32_opts[] = {
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const struct wled_u32_opts *u32_opts = NULL;
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const struct wled_u32_opts wled3_opts[] = {
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{
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"qcom,current-boost-limit",
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&cfg->boost_i_limit,
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.name = "qcom,current-boost-limit",
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.val_ptr = &cfg->boost_i_limit,
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.cfg = &wled3_boost_i_limit_cfg,
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},
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{
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"qcom,current-limit",
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&cfg->string_i_limit,
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.name = "qcom,current-limit",
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.val_ptr = &cfg->string_i_limit,
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.cfg = &wled3_string_i_limit_cfg,
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},
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{
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"qcom,ovp",
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&cfg->ovp,
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.name = "qcom,ovp",
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.val_ptr = &cfg->ovp,
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.cfg = &wled3_ovp_cfg,
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},
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{
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"qcom,switching-freq",
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&cfg->switch_freq,
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.name = "qcom,switching-freq",
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.val_ptr = &cfg->switch_freq,
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.cfg = &wled3_switch_freq_cfg,
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},
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{
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"qcom,num-strings",
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&cfg->num_strings,
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.name = "qcom,num-strings",
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.val_ptr = &cfg->num_strings,
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.cfg = &wled3_num_strings_cfg,
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},
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};
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const struct {
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const char *name;
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||||
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);
|
||||
|
||||
switch (version) {
|
||||
case 3:
|
||||
u32_opts = wled3_opts;
|
||||
size = ARRAY_SIZE(wled3_opts);
|
||||
*cfg = wled3_config_defaults;
|
||||
for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
|
||||
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)
|
||||
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);
|
||||
|
|
|
|||
Loading…
Reference in New Issue