#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/platform_device.h>
-#include <linux/pwm.h>
#include <linux/slab.h>
/* Register address */
#define MAX_BRIGHTNESS 127
#define DEFAULT_BL_NAME "lcd-backlight"
-struct lp8788_bl_config {
- enum lp8788_bl_ctrl_mode bl_mode;
- enum lp8788_bl_dim_mode dim_mode;
- enum lp8788_bl_full_scale_current full_scale;
- enum lp8788_bl_ramp_step rise_time;
- enum lp8788_bl_ramp_step fall_time;
- enum pwm_polarity pwm_pol;
-};
-
struct lp8788_bl {
struct lp8788 *lp;
struct backlight_device *bl_dev;
- struct lp8788_backlight_platform_data *pdata;
- enum lp8788_bl_ctrl_mode mode;
- struct pwm_device *pwm;
-};
-
-static struct lp8788_bl_config default_bl_config = {
- .bl_mode = LP8788_BL_REGISTER_ONLY,
- .dim_mode = LP8788_DIM_EXPONENTIAL,
- .full_scale = LP8788_FULLSCALE_1900uA,
- .rise_time = LP8788_RAMP_8192us,
- .fall_time = LP8788_RAMP_8192us,
- .pwm_pol = PWM_POLARITY_NORMAL,
};
-static inline bool is_brightness_ctrl_by_pwm(enum lp8788_bl_ctrl_mode mode)
-{
- return mode == LP8788_BL_COMB_PWM_BASED;
-}
-
-static inline bool is_brightness_ctrl_by_register(enum lp8788_bl_ctrl_mode mode)
-{
- return mode == LP8788_BL_REGISTER_ONLY ||
- mode == LP8788_BL_COMB_REGISTER_BASED;
-}
-
static int lp8788_backlight_configure(struct lp8788_bl *bl)
{
- struct lp8788_backlight_platform_data *pdata = bl->pdata;
- struct lp8788_bl_config *cfg = &default_bl_config;
int ret;
u8 val;
- /*
- * Update chip configuration if platform data exists,
- * otherwise use the default settings.
- */
- if (pdata) {
- cfg->bl_mode = pdata->bl_mode;
- cfg->dim_mode = pdata->dim_mode;
- cfg->full_scale = pdata->full_scale;
- cfg->rise_time = pdata->rise_time;
- cfg->fall_time = pdata->fall_time;
- cfg->pwm_pol = pdata->pwm_pol;
- }
-
/* Brightness ramp up/down */
- val = (cfg->rise_time << LP8788_BL_RAMP_RISE_SHIFT) | cfg->fall_time;
+ val = (LP8788_RAMP_8192us << LP8788_BL_RAMP_RISE_SHIFT) | LP8788_RAMP_8192us;
ret = lp8788_write_byte(bl->lp, LP8788_BL_RAMP, val);
if (ret)
return ret;
/* Fullscale current setting */
- val = (cfg->full_scale << LP8788_BL_FULLSCALE_SHIFT) |
- (cfg->dim_mode << LP8788_BL_DIM_MODE_SHIFT);
+ val = (LP8788_FULLSCALE_1900uA << LP8788_BL_FULLSCALE_SHIFT) |
+ (LP8788_DIM_EXPONENTIAL << LP8788_BL_DIM_MODE_SHIFT);
/* Brightness control mode */
- switch (cfg->bl_mode) {
- case LP8788_BL_REGISTER_ONLY:
- val |= LP8788_BL_EN;
- break;
- case LP8788_BL_COMB_PWM_BASED:
- case LP8788_BL_COMB_REGISTER_BASED:
- val |= LP8788_BL_EN | LP8788_BL_PWM_INPUT_EN |
- (cfg->pwm_pol << LP8788_BL_PWM_POLARITY_SHIFT);
- break;
- default:
- dev_err(bl->lp->dev, "invalid mode: %d\n", cfg->bl_mode);
- return -EINVAL;
- }
-
- bl->mode = cfg->bl_mode;
+ val |= LP8788_BL_EN;
return lp8788_write_byte(bl->lp, LP8788_BL_CONFIG, val);
}
-static void lp8788_pwm_ctrl(struct lp8788_bl *bl, int br, int max_br)
-{
- unsigned int period;
- unsigned int duty;
- struct device *dev;
- struct pwm_device *pwm;
-
- if (!bl->pdata)
- return;
-
- period = bl->pdata->period_ns;
- duty = br * period / max_br;
- dev = bl->lp->dev;
-
- /* request PWM device with the consumer name */
- if (!bl->pwm) {
- pwm = devm_pwm_get(dev, LP8788_DEV_BACKLIGHT);
- if (IS_ERR(pwm)) {
- dev_err(dev, "can not get PWM device\n");
- return;
- }
-
- bl->pwm = pwm;
-
- /*
- * FIXME: pwm_apply_args() should be removed when switching to
- * the atomic PWM API.
- */
- pwm_apply_args(pwm);
- }
-
- pwm_config(bl->pwm, duty, period);
- if (duty)
- pwm_enable(bl->pwm);
- else
- pwm_disable(bl->pwm);
-}
-
static int lp8788_bl_update_status(struct backlight_device *bl_dev)
{
struct lp8788_bl *bl = bl_get_data(bl_dev);
- enum lp8788_bl_ctrl_mode mode = bl->mode;
if (bl_dev->props.state & BL_CORE_SUSPENDED)
bl_dev->props.brightness = 0;
- if (is_brightness_ctrl_by_pwm(mode)) {
- int brt = bl_dev->props.brightness;
- int max = bl_dev->props.max_brightness;
-
- lp8788_pwm_ctrl(bl, brt, max);
- } else if (is_brightness_ctrl_by_register(mode)) {
- u8 brt = bl_dev->props.brightness;
-
- lp8788_write_byte(bl->lp, LP8788_BL_BRIGHTNESS, brt);
- }
+ lp8788_write_byte(bl->lp, LP8788_BL_BRIGHTNESS, bl_dev->props.brightness);
return 0;
}
{
struct backlight_device *bl_dev;
struct backlight_properties props;
- struct lp8788_backlight_platform_data *pdata = bl->pdata;
- int init_brt;
- char *name;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = MAX_BRIGHTNESS;
/* Initial brightness */
- if (pdata)
- init_brt = min_t(int, pdata->initial_brightness,
- props.max_brightness);
- else
- init_brt = 0;
-
- props.brightness = init_brt;
+ props.brightness = 0;
/* Backlight device name */
- if (!pdata || !pdata->name)
- name = DEFAULT_BL_NAME;
- else
- name = pdata->name;
-
- bl_dev = backlight_device_register(name, bl->lp->dev, bl,
+ bl_dev = backlight_device_register(DEFAULT_BL_NAME, bl->lp->dev, bl,
&lp8788_bl_ops, &props);
if (IS_ERR(bl_dev))
return PTR_ERR(bl_dev);
static ssize_t lp8788_get_bl_ctl_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct lp8788_bl *bl = dev_get_drvdata(dev);
- enum lp8788_bl_ctrl_mode mode = bl->mode;
- char *strmode;
-
- if (is_brightness_ctrl_by_pwm(mode))
- strmode = "PWM based";
- else if (is_brightness_ctrl_by_register(mode))
- strmode = "Register based";
- else
- strmode = "Invalid mode";
+ const char *strmode = "Register based";
return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
}
return -ENOMEM;
bl->lp = lp;
- if (lp->pdata)
- bl->pdata = lp->pdata->bl_pdata;
platform_set_drvdata(pdev, bl);
#define __MFD_LP8788_H__
#include <linux/irqdomain.h>
-#include <linux/pwm.h>
#include <linux/regmap.h>
#define LP8788_DEV_BUCK "lp8788-buck"
CHARGER_DETECTED,
};
-enum lp8788_bl_ctrl_mode {
- LP8788_BL_REGISTER_ONLY,
- LP8788_BL_COMB_PWM_BASED, /* PWM + I2C, changed by PWM input */
- LP8788_BL_COMB_REGISTER_BASED, /* PWM + I2C, changed by I2C */
-};
-
enum lp8788_bl_dim_mode {
LP8788_DIM_EXPONENTIAL,
LP8788_DIM_LINEAR,
enum lp8788_charger_event event);
};
-/*
- * struct lp8788_backlight_platform_data
- * @name : backlight driver name. (default: "lcd-backlight")
- * @initial_brightness : initial value of backlight brightness
- * @bl_mode : brightness control by pwm or lp8788 register
- * @dim_mode : dimming mode selection
- * @full_scale : full scale current setting
- * @rise_time : brightness ramp up step time
- * @fall_time : brightness ramp down step time
- * @pwm_pol : pwm polarity setting when bl_mode is pwm based
- * @period_ns : platform specific pwm period value. unit is nano.
- Only valid when bl_mode is LP8788_BL_COMB_PWM_BASED
- */
-struct lp8788_backlight_platform_data {
- char *name;
- int initial_brightness;
- enum lp8788_bl_ctrl_mode bl_mode;
- enum lp8788_bl_dim_mode dim_mode;
- enum lp8788_bl_full_scale_current full_scale;
- enum lp8788_bl_ramp_step rise_time;
- enum lp8788_bl_ramp_step fall_time;
- enum pwm_polarity pwm_pol;
- unsigned int period_ns;
-};
-
/*
* struct lp8788_led_platform_data
* @name : led driver name. (default: "keyboard-backlight")
* @buck2_dvs : configurations for buck2 dvs
* @chg_pdata : platform data for charger driver
* @alarm_sel : rtc alarm selection (1 or 2)
- * @bl_pdata : configurable data for backlight driver
* @led_pdata : configurable data for led driver
* @vib_pdata : configurable data for vibrator driver
* @adc_pdata : iio map data for adc driver
/* rtc alarm */
enum lp8788_alarm_sel alarm_sel;
- /* backlight */
- struct lp8788_backlight_platform_data *bl_pdata;
-
/* current sinks */
struct lp8788_led_platform_data *led_pdata;
struct lp8788_vib_platform_data *vib_pdata;
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