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 	if (lp->cfg->pre_init_device) {  in lp855x_configure()
176 		ret = lp->cfg->pre_init_device(lp);  in lp855x_configure()
178 			dev_err(lp->dev, "pre init device err: %d\n", ret);  in lp855x_configure()
184 	ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);  in lp855x_configure()
189 	ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);  in lp855x_configure()
197 			if (!lp855x_is_valid_rom_area(lp, addr))  in lp855x_configure()
200 			ret = lp855x_write_byte(lp, addr, val);  in lp855x_configure()
206 	if (lp->cfg->post_init_device) {  in lp855x_configure()
207 		ret = lp->cfg->post_init_device(lp);  in lp855x_configure()
209 			dev_err(lp->dev, "post init device err: %d\n", ret);  in lp855x_configure()
220 static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)  in lp855x_pwm_ctrl()  argument
224 	if (lp->needs_pwm_init) {  in lp855x_pwm_ctrl()
225 		pwm_init_state(lp->pwm, &state);  in lp855x_pwm_ctrl()
227 		if (lp->pdata->period_ns > 0)  in lp855x_pwm_ctrl()
228 			state.period = lp->pdata->period_ns;  in lp855x_pwm_ctrl()
229 		lp->needs_pwm_init = false;  in lp855x_pwm_ctrl()
231 		pwm_get_state(lp->pwm, &state);  in lp855x_pwm_ctrl()
237 	return pwm_apply_state(lp->pwm, &state);  in lp855x_pwm_ctrl()
242 	struct lp855x *lp = bl_get_data(bl);  in lp855x_bl_update_status()  local
248 	if (lp->mode == PWM_BASED)  in lp855x_bl_update_status()
249 		return lp855x_pwm_ctrl(lp, brightness,  in lp855x_bl_update_status()
251 	else if (lp->mode == REGISTER_BASED)  in lp855x_bl_update_status()
252 		return lp855x_write_byte(lp, lp->cfg->reg_brightness,  in lp855x_bl_update_status()
262 static int lp855x_backlight_register(struct lp855x *lp)  in lp855x_backlight_register()  argument
266 	struct lp855x_platform_data *pdata = lp->pdata;  in lp855x_backlight_register()
278 	bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,  in lp855x_backlight_register()
283 	lp->bl = bl;  in lp855x_backlight_register()
291 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_chip_id()  local
293 	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);  in lp855x_get_chip_id()
299 	struct lp855x *lp = dev_get_drvdata(dev);  in lp855x_get_bl_ctl_mode()  local
302 	if (lp->mode == PWM_BASED)  in lp855x_get_bl_ctl_mode()
304 	else if (lp->mode == REGISTER_BASED)  in lp855x_get_bl_ctl_mode()
324 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
326 	struct device *dev = lp->dev;  in lp855x_parse_dt()
328 	struct lp855x_platform_data *pdata = lp->pdata;  in lp855x_parse_dt()
366 static int lp855x_parse_dt(struct lp855x *lp)  in lp855x_parse_dt()  argument
372 static int lp855x_parse_acpi(struct lp855x *lp)  in lp855x_parse_acpi()  argument
381 	ret = i2c_smbus_read_byte_data(lp->client, lp->cfg->reg_brightness);  in lp855x_parse_acpi()
385 	lp->pdata->initial_brightness = ret;  in lp855x_parse_acpi()
387 	ret = i2c_smbus_read_byte_data(lp->client, lp->cfg->reg_devicectrl);  in lp855x_parse_acpi()
391 	lp->pdata->device_control = ret;  in lp855x_parse_acpi()
400 	struct lp855x *lp;  in lp855x_probe()  local
406 	lp = devm_kzalloc(dev, sizeof(struct lp855x), GFP_KERNEL);  in lp855x_probe()
407 	if (!lp)  in lp855x_probe()
410 	lp->client = cl;  in lp855x_probe()
411 	lp->dev = dev;  in lp855x_probe()
412 	lp->pdata = dev_get_platdata(dev);  in lp855x_probe()
415 		lp->chipname = id->name;  in lp855x_probe()
416 		lp->chip_id = id->driver_data;  in lp855x_probe()
422 		lp->chipname = acpi_id->id;  in lp855x_probe()
423 		lp->chip_id = acpi_id->driver_data;  in lp855x_probe()
426 	switch (lp->chip_id) {  in lp855x_probe()
432 		lp->cfg = &lp855x_dev_cfg;  in lp855x_probe()
436 		lp->cfg = &lp8557_dev_cfg;  in lp855x_probe()
442 	if (!lp->pdata) {  in lp855x_probe()
443 		lp->pdata = devm_kzalloc(dev, sizeof(*lp->pdata), GFP_KERNEL);  in lp855x_probe()
444 		if (!lp->pdata)  in lp855x_probe()
448 			ret = lp855x_parse_dt(lp);  in lp855x_probe()
452 			ret = lp855x_parse_acpi(lp);  in lp855x_probe()
458 	lp->supply = devm_regulator_get(dev, "power");  in lp855x_probe()
459 	if (IS_ERR(lp->supply)) {  in lp855x_probe()
460 		if (PTR_ERR(lp->supply) == -EPROBE_DEFER)  in lp855x_probe()
462 		lp->supply = NULL;  in lp855x_probe()
465 	lp->enable = devm_regulator_get_optional(dev, "enable");  in lp855x_probe()
466 	if (IS_ERR(lp->enable)) {  in lp855x_probe()
467 		ret = PTR_ERR(lp->enable);  in lp855x_probe()
469 			lp->enable = NULL;  in lp855x_probe()
474 	lp->pwm = devm_pwm_get(lp->dev, lp->chipname);  in lp855x_probe()
475 	if (IS_ERR(lp->pwm)) {  in lp855x_probe()
476 		ret = PTR_ERR(lp->pwm);  in lp855x_probe()
478 			lp->pwm = NULL;  in lp855x_probe()
482 		lp->needs_pwm_init = false;  in lp855x_probe()
483 		lp->mode = REGISTER_BASED;  in lp855x_probe()
486 		lp->needs_pwm_init = true;  in lp855x_probe()
487 		lp->mode = PWM_BASED;  in lp855x_probe()
491 	if (lp->supply) {  in lp855x_probe()
492 		ret = regulator_enable(lp->supply);  in lp855x_probe()
499 	if (lp->enable) {  in lp855x_probe()
500 		ret = regulator_enable(lp->enable);  in lp855x_probe()
513 	i2c_set_clientdata(cl, lp);  in lp855x_probe()
515 	ret = lp855x_configure(lp);  in lp855x_probe()
521 	ret = lp855x_backlight_register(lp);  in lp855x_probe()
533 	backlight_update_status(lp->bl);  in lp855x_probe()
538 	if (lp->enable)  in lp855x_probe()
539 		regulator_disable(lp->enable);  in lp855x_probe()
541 	if (lp->supply)  in lp855x_probe()
542 		regulator_disable(lp->supply);  in lp855x_probe()
549 	struct lp855x *lp = i2c_get_clientdata(cl);  in lp855x_remove()  local
551 	lp->bl->props.brightness = 0;  in lp855x_remove()
552 	backlight_update_status(lp->bl);  in lp855x_remove()
553 	if (lp->enable)  in lp855x_remove()
554 		regulator_disable(lp->enable);  in lp855x_remove()
555 	if (lp->supply)  in lp855x_remove()
556 		regulator_disable(lp->supply);  in lp855x_remove()
557 	sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);  in lp855x_remove()