leds: qpnp-wled: add support for brightness mapping
Currently, WLED driver is being passed with a 12 bit brightness level by the clients and they're set in the hardware registers. Add support for brightness mapping by providing a 256 entry table where each entry can take a 12 bit brightness level value. This will be mapped internally for controlling different brightness regions in an user preferred way. Change-Id: I7adf97918a311bf54b02b383defeb59685aa0d00 Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
This commit is contained in:
Subbaraman Narayanamurthy
parent
4f8f073776
commit
a1e681aaf6
2 changed files with 101 additions and 4 deletions
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@ -80,6 +80,10 @@ Optional properties for WLED:
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or disabled.
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- qcom,auto-calibration-enable : A boolean property which enables auto-calibration
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of the WLED sink configuration.
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- qcom,wled-brightness-map : Array of brightness map codes of size 256.
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These codes will be mapped to the brightness
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level requested in the scale of 0-4095. Code
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entry is of 16 bit size.
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Optional properties if 'qcom,disp-type-amoled' is mentioned in DT:
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- qcom,loop-comp-res-kohm : control to select the compensation resistor in kohm. default is 320.
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@ -123,4 +127,5 @@ Example:
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qcom,en-phase-stag;
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qcom,led-strings-list = [00 01 02 03];
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qcom,en-ext-pfet-sc-pro;
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qcom,wled-brightness-map = /bits/ 16 <0 . . 4095>;
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};
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@ -210,6 +210,7 @@
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#define QPNP_WLED_SEC_ACCESS_REG(b) (b + 0xD0)
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#define QPNP_WLED_SEC_UNLOCK 0xA5
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#define NUM_DDIC_CODES 256
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#define QPNP_WLED_MAX_STRINGS 4
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#define QPNP_PM660_WLED_MAX_STRINGS 3
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#define WLED_MAX_LEVEL_4095 4095
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@ -340,6 +341,10 @@ static struct wled_vref_setting vref_setting_pmi8998 = {
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* @ ramp_ms - delay between ramp steps in ms
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* @ ramp_step - ramp step size
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* @ cons_sync_write_delay_us - delay between two consecutive writes to SYNC
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* @ auto_calibration_ovp_count - OVP fault irq count to run auto calibration
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* @ max_strings - Number of strings supported in WLED peripheral
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* @ prev_level - Previous brightness level
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* @ brt_map_table - Brightness map table
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* @ strings - supported list of strings
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* @ num_strings - number of strings
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* @ loop_auto_gm_thresh - the clamping level for auto gm
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@ -353,6 +358,12 @@ static struct wled_vref_setting vref_setting_pmi8998 = {
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* @ en_cabc - enable or disable cabc
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* @ disp_type_amoled - type of display: LCD/AMOLED
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* @ en_ext_pfet_sc_pro - enable sc protection on external pfet
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* @ prev_state - previous state of WLED
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* @ ovp_irq_disabled - OVP interrupt disable status
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* @ auto_calib_enabled - Flag to enable auto calibration feature
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* @ auto_calib_done - Flag to indicate auto calibration is done
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* @ module_dis_perm - Flat to keep module permanently disabled
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* @ start_ovp_fault_time - Time when the OVP fault first occurred
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*/
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struct qpnp_wled {
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struct led_classdev cdev;
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@ -388,6 +399,8 @@ struct qpnp_wled {
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u16 cons_sync_write_delay_us;
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u16 auto_calibration_ovp_count;
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u16 max_strings;
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u16 prev_level;
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u16 *brt_map_table;
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u8 strings[QPNP_WLED_MAX_STRINGS];
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u8 num_strings;
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u8 loop_auto_gm_thresh;
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@ -573,6 +586,33 @@ static int qpnp_wled_set_level(struct qpnp_wled *wled, int level)
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return 0;
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}
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static int qpnp_wled_set_map_level(struct qpnp_wled *wled, int level)
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{
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int rc, i;
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if (level < wled->prev_level) {
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for (i = wled->prev_level; i >= level; i--) {
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rc = qpnp_wled_set_level(wled, wled->brt_map_table[i]);
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if (rc < 0) {
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pr_err("set brightness level failed, rc:%d\n",
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rc);
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return rc;
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}
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}
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} else if (level > wled->prev_level) {
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for (i = wled->prev_level; i <= level; i++) {
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rc = qpnp_wled_set_level(wled, wled->brt_map_table[i]);
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if (rc < 0) {
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pr_err("set brightness level failed, rc:%d\n",
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rc);
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return rc;
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}
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}
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}
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return 0;
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}
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static int qpnp_wled_psm_config(struct qpnp_wled *wled, bool enable)
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{
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int rc;
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@ -942,15 +982,30 @@ static struct device_attribute qpnp_wled_attrs[] = {
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static void qpnp_wled_work(struct work_struct *work)
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{
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struct qpnp_wled *wled;
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int level, rc;
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int level, level_255, rc;
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wled = container_of(work, struct qpnp_wled, work);
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mutex_lock(&wled->lock);
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level = wled->cdev.brightness;
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mutex_lock(&wled->lock);
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if (wled->brt_map_table) {
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/*
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* Change the 12 bit level to 8 bit level and use the mapped
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* values for 12 bit level from brightness map table.
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*/
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level_255 = DIV_ROUND_CLOSEST(level, 16);
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if (level_255 > 255)
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level_255 = 255;
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if (level) {
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pr_debug("level: %d level_255: %d\n", level, level_255);
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rc = qpnp_wled_set_map_level(wled, level_255);
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if (rc) {
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dev_err(&wled->pdev->dev, "wled set level failed\n");
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goto unlock_mutex;
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}
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wled->prev_level = level_255;
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} else if (level) {
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rc = qpnp_wled_set_level(wled, level);
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if (rc) {
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dev_err(&wled->pdev->dev, "wled set level failed\n");
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@ -2115,7 +2170,7 @@ static int qpnp_wled_parse_dt(struct qpnp_wled *wled)
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struct property *prop;
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const char *temp_str;
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u32 temp_val;
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int rc, i;
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int rc, i, size;
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u8 *strings;
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wled->cdev.name = "wled";
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@ -2134,6 +2189,43 @@ static int qpnp_wled_parse_dt(struct qpnp_wled *wled)
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return rc;
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}
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if (of_find_property(pdev->dev.of_node, "qcom,wled-brightness-map",
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NULL)) {
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size = of_property_count_elems_of_size(pdev->dev.of_node,
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"qcom,wled-brightness-map", sizeof(u16));
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if (size != NUM_DDIC_CODES) {
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pr_err("Invalid WLED brightness map size:%d\n", size);
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return rc;
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}
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wled->brt_map_table = devm_kcalloc(&pdev->dev, NUM_DDIC_CODES,
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sizeof(u16), GFP_KERNEL);
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if (!wled->brt_map_table)
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return -ENOMEM;
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rc = of_property_read_u16_array(pdev->dev.of_node,
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"qcom,wled-brightness-map", wled->brt_map_table,
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NUM_DDIC_CODES);
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if (rc < 0) {
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pr_err("Error in reading WLED brightness map, rc=%d\n",
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rc);
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return rc;
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}
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for (i = 0; i < NUM_DDIC_CODES; i++) {
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if (wled->brt_map_table[i] > WLED_MAX_LEVEL_4095) {
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pr_err("WLED brightness map not in range\n");
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return -EDOM;
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}
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if ((i > 1) && wled->brt_map_table[i]
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< wled->brt_map_table[i - 1]) {
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pr_err("WLED brightness map not in ascending order?\n");
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return -EDOM;
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}
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}
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}
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wled->disp_type_amoled = of_property_read_bool(pdev->dev.of_node,
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"qcom,disp-type-amoled");
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if (wled->disp_type_amoled) {
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