8 #include <linux/counter.h>
46  * @preset:	array of Counter Register states
57 static int i8254_count_read(struct counter_device *const counter, struct counter_count *const count,  in i8254_count_read()  argument
60 	struct i8254 *const priv = counter_priv(counter);  in i8254_count_read()
84 static int i8254_function_read(struct counter_device *const counter,  in i8254_function_read()  argument
96 static int i8254_action_read(struct counter_device *const counter,  in i8254_action_read()  argument
101 	struct i8254 *const priv = counter_priv(counter);  in i8254_action_read()
125 static int i8254_count_ceiling_read(struct counter_device *const counter,  in i8254_count_ceiling_read()  argument
128 	struct i8254 *const priv = counter_priv(counter);  in i8254_count_ceiling_read()
134 		/* Rate Generator decrements 0 by one and the counter "wraps around" */  in i8254_count_ceiling_read()
141 			/* Square Wave Mode decrements 0 by two and the counter "wraps around" */  in i8254_count_ceiling_read()
156 static int i8254_count_mode_read(struct counter_device *const counter,  in i8254_count_mode_read()  argument
160 	const struct i8254 *const priv = counter_priv(counter);  in i8254_count_mode_read()
187 static int i8254_count_mode_write(struct counter_device *const counter,  in i8254_count_mode_write()  argument
191 	struct i8254 *const priv = counter_priv(counter);  in i8254_count_mode_write()
221 	/* Counter Register is cleared when the counter is programmed */  in i8254_count_mode_write()
232 static int i8254_count_floor_read(struct counter_device *const counter,  in i8254_count_floor_read()  argument
235 	struct i8254 *const priv = counter_priv(counter);  in i8254_count_floor_read()
241 		/* counter is always reloaded after 1, but 0 is a possible reload value */  in i8254_count_floor_read()
245 		/* counter is always reloaded after 2 for even preset values */  in i8254_count_floor_read()
258 static int i8254_count_preset_read(struct counter_device *const counter,  in i8254_count_preset_read()  argument
261 	const struct i8254 *const priv = counter_priv(counter);  in i8254_count_preset_read()
268 static int i8254_count_preset_write(struct counter_device *const counter,  in i8254_count_preset_write()  argument
271 	struct i8254 *const priv = counter_priv(counter);  in i8254_count_preset_write()
304 		/* Initialize each counter to Mode 0 */  in i8254_init_hw()
392 	I8254_COUNT(0, "Counter 0"), I8254_COUNT(1, "Counter 1"), I8254_COUNT(2, "Counter 2"),
396  * devm_i8254_regmap_register - Register an i8254 Counter device
397  * @dev: device that is registering this i8254 Counter device
400  * Registers an Intel 8254 Programmable Interval Timer Counter device. Returns 0 on success and
406 	struct counter_device *counter;  in devm_i8254_regmap_register()  local
416 	counter = devm_counter_alloc(dev, sizeof(*priv));  in devm_i8254_regmap_register()
417 	if (!counter)  in devm_i8254_regmap_register()
419 	priv = counter_priv(counter);  in devm_i8254_regmap_register()
422 	counter->name = dev_name(config->parent);  in devm_i8254_regmap_register()
423 	counter->parent = config->parent;  in devm_i8254_regmap_register()
424 	counter->ops = &i8254_ops;  in devm_i8254_regmap_register()
425 	counter->counts = i8254_counts;  in devm_i8254_regmap_register()
426 	counter->num_counts = ARRAY_SIZE(i8254_counts);  in devm_i8254_regmap_register()
427 	counter->signals = i8254_signals;  in devm_i8254_regmap_register()
428 	counter->num_signals = ARRAY_SIZE(i8254_signals);  in devm_i8254_regmap_register()
436 	err = devm_counter_add(dev, counter);  in devm_i8254_regmap_register()
438 		return dev_err_probe(dev, err, "Failed to add counter\n");  in devm_i8254_regmap_register()
447 MODULE_IMPORT_NS(COUNTER);