79 static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)  in lp855x_write_byte()  argument
81 	return i2c_smbus_write_byte_data(lp->client, reg, data);  in lp855x_write_byte()
84 static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data)  in lp855x_update_bit()  argument
89 	ret = i2c_smbus_read_byte_data(lp->client, reg);  in lp855x_update_bit()
91 		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);  in lp855x_update_bit()
99 	return lp855x_write_byte(lp, reg, tmp);  in lp855x_update_bit()
102 static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)  in lp855x_is_valid_rom_area()  argument
106 	switch (lp->chip_id) {  in lp855x_is_valid_rom_area()
133 static int lp8557_bl_off(struct lp855x *lp)  in lp8557_bl_off()  argument
136 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,  in lp8557_bl_off()
140 static int lp8557_bl_on(struct lp855x *lp)  in lp8557_bl_on()  argument
143 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,  in lp8557_bl_on()
169 static int lp855x_configure(struct lp855x *lp)  in lp855x_configure()  argument
173 	struct lp855x_platform_data *pd = lp->pdata;  in lp855x_configure()
175 	switch (lp->chip_id) {  in lp855x_configure()
181 		lp->cfg = &lp855x_dev_cfg;  in lp855x_configure()
185 		lp->cfg = &lp8557_dev_cfg;  in lp855x_configure()
191 	if (lp->cfg->pre_init_device) {  in lp855x_configure()
192 		ret = lp->cfg->pre_init_device(lp);  in lp855x_configure()
194 			dev_err(lp->dev, "pre init device err: %d\n", ret);  in lp855x_configure()
200 	ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);  in lp855x_configure()
205 	ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);  in lp855x_configure()
213 			if (!lp855x_is_valid_rom_area(lp, addr))  in lp855x_configure()
216 			ret = lp855x_write_byte(lp, addr, val);  in lp855x_configure()
222 	if (lp->cfg->post_init_device) {  in lp855x_configure()
223 		ret = lp->cfg->post_init_device(lp);  in lp855x_configure()
225 			dev_err(lp->dev, "post init device err: %d\n", ret);  in lp855x_configure()
236 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)  in lp855x_pwm_ctrl()  argument
238 	unsigned int period = lp->pdata->period_ns;  in lp855x_pwm_ctrl()
243 	if (!lp->pwm) {  in lp855x_pwm_ctrl()
244 		pwm = devm_pwm_get(lp->dev, lp->chipname);  in lp855x_pwm_ctrl()
248 		lp->pwm = pwm;  in lp855x_pwm_ctrl()
251 	pwm_config(lp->pwm, duty, period);  in lp855x_pwm_ctrl()
253 		pwm_enable(lp->pwm);  in lp855x_pwm_ctrl()
255 		pwm_disable(lp->pwm);  in lp855x_pwm_ctrl()
260 	struct lp855x *lp = bl_get_data(bl);  in lp855x_bl_update_status()  local
266 	if (lp->mode == PWM_BASED)  in lp855x_bl_update_status()
267 		lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness);  in lp855x_bl_update_status()
268 	else if (lp->mode == REGISTER_BASED)  in lp855x_bl_update_status()
269 		lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness);  in lp855x_bl_update_status()
279 static int lp855x_backlight_register(struct lp855x *lp)  in lp855x_backlight_register()  argument
283 	struct lp855x_platform_data *pdata = lp->pdata;  in lp855x_backlight_register()
295 	bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,  in lp855x_backlight_register()
300 	lp->bl = bl;  in lp855x_backlight_register()
308 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_chip_id()  local
310 	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);  in lp855x_get_chip_id()
316 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_bl_ctl_mode()  local
319 	if (lp->mode == PWM_BASED)  in lp855x_get_bl_ctl_mode()
321 	else if (lp->mode == REGISTER_BASED)  in lp855x_get_bl_ctl_mode()
341 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
343 	struct device *dev = lp->dev;  in lp855x_parse_dt()
383 	lp->pdata = pdata;  in lp855x_parse_dt()
388 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
396 	struct lp855x *lp;  in lp855x_probe()  local
402 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL);  in lp855x_probe()
403 	if (!lp)  in lp855x_probe()
406 	lp->client = cl;  in lp855x_probe()
407 	lp->dev = &cl->dev;  in lp855x_probe()
408 	lp->chipname = id->name;  in lp855x_probe()
409 	lp->chip_id = id->driver_data;  in lp855x_probe()
410 	lp->pdata = dev_get_platdata(&cl->dev);  in lp855x_probe()
412 	if (!lp->pdata) {  in lp855x_probe()
413 		ret = lp855x_parse_dt(lp);  in lp855x_probe()
418 	if (lp->pdata->period_ns > 0)  in lp855x_probe()
419 		lp->mode = PWM_BASED;  in lp855x_probe()
421 		lp->mode = REGISTER_BASED;  in lp855x_probe()
423 	lp->supply = devm_regulator_get(lp->dev, "power");  in lp855x_probe()
424 	if (IS_ERR(lp->supply)) {  in lp855x_probe()
425 		if (PTR_ERR(lp->supply) == -EPROBE_DEFER)  in lp855x_probe()
427 		lp->supply = NULL;  in lp855x_probe()
430 	if (lp->supply) {  in lp855x_probe()
431 		ret = regulator_enable(lp->supply);  in lp855x_probe()
438 	i2c_set_clientdata(cl, lp);  in lp855x_probe()
440 	ret = lp855x_configure(lp);  in lp855x_probe()
442 		dev_err(lp->dev, "device config err: %d", ret);  in lp855x_probe()
446 	ret = lp855x_backlight_register(lp);  in lp855x_probe()
448 		dev_err(lp->dev,  in lp855x_probe()
453 	ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group);  in lp855x_probe()
455 		dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);  in lp855x_probe()
459 	backlight_update_status(lp->bl);  in lp855x_probe()
465 	struct lp855x *lp = i2c_get_clientdata(cl);  in lp855x_remove()  local
467 	lp->bl->props.brightness = 0;  in lp855x_remove()
468 	backlight_update_status(lp->bl);  in lp855x_remove()
469 	if (lp->supply)  in lp855x_remove()
470 		regulator_disable(lp->supply);  in lp855x_remove()
471 	sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);  in lp855x_remove()