78 static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)  in lp855x_write_byte()  argument
80 	return i2c_smbus_write_byte_data(lp->client, reg, data);  in lp855x_write_byte()
83 static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data)  in lp855x_update_bit()  argument
88 	ret = i2c_smbus_read_byte_data(lp->client, reg);  in lp855x_update_bit()
90 		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);  in lp855x_update_bit()
98 	return lp855x_write_byte(lp, reg, tmp);  in lp855x_update_bit()
101 static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)  in lp855x_is_valid_rom_area()  argument
105 	switch (lp->chip_id) {  in lp855x_is_valid_rom_area()
132 static int lp8557_bl_off(struct lp855x *lp)  in lp8557_bl_off()  argument
135 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,  in lp8557_bl_off()
139 static int lp8557_bl_on(struct lp855x *lp)  in lp8557_bl_on()  argument
142 	return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,  in lp8557_bl_on()
168 static int lp855x_configure(struct lp855x *lp)  in lp855x_configure()  argument
172 	struct lp855x_platform_data *pd = lp->pdata;  in lp855x_configure()
174 	switch (lp->chip_id) {  in lp855x_configure()
180 		lp->cfg = &lp855x_dev_cfg;  in lp855x_configure()
184 		lp->cfg = &lp8557_dev_cfg;  in lp855x_configure()
190 	if (lp->cfg->pre_init_device) {  in lp855x_configure()
191 		ret = lp->cfg->pre_init_device(lp);  in lp855x_configure()
193 			dev_err(lp->dev, "pre init device err: %d\n", ret);  in lp855x_configure()
199 	ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);  in lp855x_configure()
204 	ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);  in lp855x_configure()
212 			if (!lp855x_is_valid_rom_area(lp, addr))  in lp855x_configure()
215 			ret = lp855x_write_byte(lp, addr, val);  in lp855x_configure()
221 	if (lp->cfg->post_init_device) {  in lp855x_configure()
222 		ret = lp->cfg->post_init_device(lp);  in lp855x_configure()
224 			dev_err(lp->dev, "post init device err: %d\n", ret);  in lp855x_configure()
235 static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)  in lp855x_pwm_ctrl()  argument
237 	unsigned int period = lp->pdata->period_ns;  in lp855x_pwm_ctrl()
242 	if (!lp->pwm) {  in lp855x_pwm_ctrl()
243 		pwm = devm_pwm_get(lp->dev, lp->chipname);  in lp855x_pwm_ctrl()
247 		lp->pwm = pwm;  in lp855x_pwm_ctrl()
250 	pwm_config(lp->pwm, duty, period);  in lp855x_pwm_ctrl()
252 		pwm_enable(lp->pwm);  in lp855x_pwm_ctrl()
254 		pwm_disable(lp->pwm);  in lp855x_pwm_ctrl()
259 	struct lp855x *lp = bl_get_data(bl);  in lp855x_bl_update_status()  local
264 	if (lp->mode == PWM_BASED) {  in lp855x_bl_update_status()
268 		lp855x_pwm_ctrl(lp, br, max_br);  in lp855x_bl_update_status()
270 	} else if (lp->mode == REGISTER_BASED) {  in lp855x_bl_update_status()
273 		lp855x_write_byte(lp, lp->cfg->reg_brightness, val);  in lp855x_bl_update_status()
284 static int lp855x_backlight_register(struct lp855x *lp)  in lp855x_backlight_register()  argument
288 	struct lp855x_platform_data *pdata = lp->pdata;  in lp855x_backlight_register()
299 	bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,  in lp855x_backlight_register()
304 	lp->bl = bl;  in lp855x_backlight_register()
312 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_chip_id()  local
314 	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);  in lp855x_get_chip_id()
320 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_bl_ctl_mode()  local
323 	if (lp->mode == PWM_BASED)  in lp855x_get_bl_ctl_mode()
325 	else if (lp->mode == REGISTER_BASED)  in lp855x_get_bl_ctl_mode()
345 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
347 	struct device *dev = lp->dev;  in lp855x_parse_dt()
394 	lp->pdata = pdata;  in lp855x_parse_dt()
399 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
407 	struct lp855x *lp;  in lp855x_probe()  local
413 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL);  in lp855x_probe()
414 	if (!lp)  in lp855x_probe()
417 	lp->client = cl;  in lp855x_probe()
418 	lp->dev = &cl->dev;  in lp855x_probe()
419 	lp->chipname = id->name;  in lp855x_probe()
420 	lp->chip_id = id->driver_data;  in lp855x_probe()
421 	lp->pdata = dev_get_platdata(&cl->dev);  in lp855x_probe()
423 	if (!lp->pdata) {  in lp855x_probe()
424 		ret = lp855x_parse_dt(lp);  in lp855x_probe()
429 	if (lp->pdata->period_ns > 0)  in lp855x_probe()
430 		lp->mode = PWM_BASED;  in lp855x_probe()
432 		lp->mode = REGISTER_BASED;  in lp855x_probe()
434 	if (lp->pdata->supply) {  in lp855x_probe()
435 		ret = regulator_enable(lp->pdata->supply);  in lp855x_probe()
442 	i2c_set_clientdata(cl, lp);  in lp855x_probe()
444 	ret = lp855x_configure(lp);  in lp855x_probe()
446 		dev_err(lp->dev, "device config err: %d", ret);  in lp855x_probe()
450 	ret = lp855x_backlight_register(lp);  in lp855x_probe()
452 		dev_err(lp->dev,  in lp855x_probe()
457 	ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group);  in lp855x_probe()
459 		dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);  in lp855x_probe()
463 	backlight_update_status(lp->bl);  in lp855x_probe()
469 	struct lp855x *lp = i2c_get_clientdata(cl);  in lp855x_remove()  local
471 	lp->bl->props.brightness = 0;  in lp855x_remove()
472 	backlight_update_status(lp->bl);  in lp855x_remove()
473 	if (lp->pdata->supply)  in lp855x_remove()
474 		regulator_disable(lp->pdata->supply);  in lp855x_remove()
475 	sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);  in lp855x_remove()