drivers/input/rmi4/rmi_bus.h

   1 /*
   2  * Copyright (c) 2011-2016 Synaptics Incorporated
   3  * Copyright (c) 2011 Unixphere
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #ifndef _RMI_BUS_H
  11 #define _RMI_BUS_H
  12
  13 #include <linux/rmi.h>
  14
  15 struct rmi_device;
  16
  17 /**
  18  * struct rmi_function - represents the implementation of an RMI4
  19  * function for a particular device (basically, a driver for that RMI4 function)
  20  *
  21  * @fd: The function descriptor of the RMI function
  22  * @rmi_dev: Pointer to the RMI device associated with this function container
  23  * @dev: The device associated with this particular function.
  24  *
  25  * @num_of_irqs: The number of irqs needed by this function
  26  * @irq_pos: The position in the irq bitfield this function holds
  27  * @irq_mask: For convenience, can be used to mask IRQ bits off during ATTN
  28  * interrupt handling.
  29  *
  30  * @node: entry in device's list of functions
  31  */
  32 struct rmi_function {
  33         struct rmi_function_descriptor fd;
  34         struct rmi_device *rmi_dev;
  35         struct device dev;
  36         struct list_head node;
  37
  38         unsigned int num_of_irqs;
  39         unsigned int irq_pos;
  40         unsigned long irq_mask[];
  41 };
  42
  43 #define to_rmi_function(d)      container_of(d, struct rmi_function, dev)
  44
  45 bool rmi_is_function_device(struct device *dev);
  46
  47 int __must_check rmi_register_function(struct rmi_function *);
  48 void rmi_unregister_function(struct rmi_function *);
  49
  50 /**
  51  * struct rmi_function_handler - driver routines for a particular RMI function.
  52  *
  53  * @func: The RMI function number
  54  * @reset: Called when a reset of the touch sensor is detected.  The routine
  55  * should perform any out-of-the-ordinary reset handling that might be
  56  * necessary.  Restoring of touch sensor configuration registers should be
  57  * handled in the config() callback, below.
  58  * @config: Called when the function container is first initialized, and
  59  * after a reset is detected.  This routine should write any necessary
  60  * configuration settings to the device.
  61  * @attention: Called when the IRQ(s) for the function are set by the touch
  62  * sensor.
  63  * @suspend: Should perform any required operations to suspend the particular
  64  * function.
  65  * @resume: Should perform any required operations to resume the particular
  66  * function.
  67  *
  68  * All callbacks are expected to return 0 on success, error code on failure.
  69  */
  70 struct rmi_function_handler {
  71         struct device_driver driver;
  72
  73         u8 func;
  74
  75         int (*probe)(struct rmi_function *fn);
  76         void (*remove)(struct rmi_function *fn);
  77         int (*config)(struct rmi_function *fn);
  78         int (*reset)(struct rmi_function *fn);
  79         int (*attention)(struct rmi_function *fn, unsigned long *irq_bits);
  80         int (*suspend)(struct rmi_function *fn);
  81         int (*resume)(struct rmi_function *fn);
  82 };
  83
  84 #define to_rmi_function_handler(d) \
  85                 container_of(d, struct rmi_function_handler, driver)
  86
  87 int __must_check __rmi_register_function_handler(struct rmi_function_handler *,
  88                                                  struct module *, const char *);
  89 #define rmi_register_function_handler(handler) \
  90         __rmi_register_function_handler(handler, THIS_MODULE, KBUILD_MODNAME)
  91
  92 void rmi_unregister_function_handler(struct rmi_function_handler *);
  93
  94 #define to_rmi_driver(d) \
  95         container_of(d, struct rmi_driver, driver)
  96
  97 #define to_rmi_device(d) container_of(d, struct rmi_device, dev)
  98
  99 static inline struct rmi_device_platform_data *
 100 rmi_get_platform_data(struct rmi_device *d)
 101 {
 102         return &d->xport->pdata;
 103 }
 104
 105 bool rmi_is_physical_device(struct device *dev);
 106
 107 /**
 108  * rmi_reset - reset a RMI4 device
 109  * @d: Pointer to an RMI device
 110  *
 111  * Calls for a reset of each function implemented by a specific device.
 112  * Returns 0 on success or a negative error code.
 113  */
 114 static inline int rmi_reset(struct rmi_device *d)
 115 {
 116         return d->driver->reset_handler(d);
 117 }
 118
 119 /**
 120  * rmi_read - read a single byte
 121  * @d: Pointer to an RMI device
 122  * @addr: The address to read from
 123  * @buf: The read buffer
 124  *
 125  * Reads a single byte of data using the underlying transport protocol
 126  * into memory pointed by @buf. It returns 0 on success or a negative
 127  * error code.
 128  */
 129 static inline int rmi_read(struct rmi_device *d, u16 addr, u8 *buf)
 130 {
 131         return d->xport->ops->read_block(d->xport, addr, buf, 1);
 132 }
 133
 134 /**
 135  * rmi_read_block - read a block of bytes
 136  * @d: Pointer to an RMI device
 137  * @addr: The start address to read from
 138  * @buf: The read buffer
 139  * @len: Length of the read buffer
 140  *
 141  * Reads a block of byte data using the underlying transport protocol
 142  * into memory pointed by @buf. It returns 0 on success or a negative
 143  * error code.
 144  */
 145 static inline int rmi_read_block(struct rmi_device *d, u16 addr,
 146                                  void *buf, size_t len)
 147 {
 148         return d->xport->ops->read_block(d->xport, addr, buf, len);
 149 }
 150
 151 /**
 152  * rmi_write - write a single byte
 153  * @d: Pointer to an RMI device
 154  * @addr: The address to write to
 155  * @data: The data to write
 156  *
 157  * Writes a single byte using the underlying transport protocol. It
 158  * returns zero on success or a negative error code.
 159  */
 160 static inline int rmi_write(struct rmi_device *d, u16 addr, u8 data)
 161 {
 162         return d->xport->ops->write_block(d->xport, addr, &data, 1);
 163 }
 164
 165 /**
 166  * rmi_write_block - write a block of bytes
 167  * @d: Pointer to an RMI device
 168  * @addr: The start address to write to
 169  * @buf: The write buffer
 170  * @len: Length of the write buffer
 171  *
 172  * Writes a block of byte data from buf using the underlaying transport
 173  * protocol.  It returns the amount of bytes written or a negative error code.
 174  */
 175 static inline int rmi_write_block(struct rmi_device *d, u16 addr,
 176                                   const void *buf, size_t len)
 177 {
 178         return d->xport->ops->write_block(d->xport, addr, buf, len);
 179 }
 180
 181 int rmi_for_each_dev(void *data, int (*func)(struct device *dev, void *data));
 182
 183 extern struct bus_type rmi_bus_type;
 184
 185 int rmi_of_property_read_u32(struct device *dev, u32 *result,
 186                                 const char *prop, bool optional);
 187
 188 #define RMI_DEBUG_CORE                  BIT(0)
 189 #define RMI_DEBUG_XPORT                 BIT(1)
 190 #define RMI_DEBUG_FN                    BIT(2)
 191 #define RMI_DEBUG_2D_SENSOR             BIT(3)
 192
 193 void rmi_dbg(int flags, struct device *dev, const char *fmt, ...);
 194 #endif