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Linux/include/linux/mfd/ipaq-micro.h

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  1 /*
  2  * Header file for the compaq Micro MFD
  3  */
  4 
  5 #ifndef _MFD_IPAQ_MICRO_H_
  6 #define _MFD_IPAQ_MICRO_H_
  7 
  8 #include <linux/spinlock.h>
  9 #include <linux/completion.h>
 10 #include <linux/list.h>
 11 
 12 #define TX_BUF_SIZE     32
 13 #define RX_BUF_SIZE     16
 14 #define CHAR_SOF        0x02
 15 
 16 /*
 17  * These are the different messages that can be sent to the microcontroller
 18  * to control various aspects.
 19  */
 20 #define MSG_VERSION             0x0
 21 #define MSG_KEYBOARD            0x2
 22 #define MSG_TOUCHSCREEN         0x3
 23 #define MSG_EEPROM_READ         0x4
 24 #define MSG_EEPROM_WRITE        0x5
 25 #define MSG_THERMAL_SENSOR      0x6
 26 #define MSG_NOTIFY_LED          0x8
 27 #define MSG_BATTERY             0x9
 28 #define MSG_SPI_READ            0xb
 29 #define MSG_SPI_WRITE           0xc
 30 #define MSG_BACKLIGHT           0xd /* H3600 only */
 31 #define MSG_CODEC_CTRL          0xe /* H3100 only */
 32 #define MSG_DISPLAY_CTRL        0xf /* H3100 only */
 33 
 34 /* state of receiver parser */
 35 enum rx_state {
 36         STATE_SOF = 0,     /* Next byte should be start of frame */
 37         STATE_ID,          /* Next byte is ID & message length   */
 38         STATE_DATA,        /* Next byte is a data byte           */
 39         STATE_CHKSUM       /* Next byte should be checksum       */
 40 };
 41 
 42 /**
 43  * struct ipaq_micro_txdev - TX state
 44  * @len: length of message in TX buffer
 45  * @index: current index into TX buffer
 46  * @buf: TX buffer
 47  */
 48 struct ipaq_micro_txdev {
 49         u8 len;
 50         u8 index;
 51         u8 buf[TX_BUF_SIZE];
 52 };
 53 
 54 /**
 55  * struct ipaq_micro_rxdev - RX state
 56  * @state: context of RX state machine
 57  * @chksum: calculated checksum
 58  * @id: message ID from packet
 59  * @len: RX buffer length
 60  * @index: RX buffer index
 61  * @buf: RX buffer
 62  */
 63 struct ipaq_micro_rxdev {
 64         enum rx_state state;
 65         unsigned char chksum;
 66         u8            id;
 67         unsigned int  len;
 68         unsigned int  index;
 69         u8            buf[RX_BUF_SIZE];
 70 };
 71 
 72 /**
 73  * struct ipaq_micro_msg - message to the iPAQ microcontroller
 74  * @id: 4-bit ID of the message
 75  * @tx_len: length of TX data
 76  * @tx_data: TX data to send
 77  * @rx_len: length of receieved RX data
 78  * @rx_data: RX data to recieve
 79  * @ack: a completion that will be completed when RX is complete
 80  * @node: list node if message gets queued
 81  */
 82 struct ipaq_micro_msg {
 83         u8 id;
 84         u8 tx_len;
 85         u8 tx_data[TX_BUF_SIZE];
 86         u8 rx_len;
 87         u8 rx_data[RX_BUF_SIZE];
 88         struct completion ack;
 89         struct list_head node;
 90 };
 91 
 92 /**
 93  * struct ipaq_micro - iPAQ microcontroller state
 94  * @dev: corresponding platform device
 95  * @base: virtual memory base for underlying serial device
 96  * @sdlc: virtual memory base for Synchronous Data Link Controller
 97  * @version: version string
 98  * @tx: TX state
 99  * @rx: RX state
100  * @lock: lock for this state container
101  * @msg: current message
102  * @queue: message queue
103  * @key: callback for asynchronous key events
104  * @key_data: data to pass along with key events
105  * @ts: callback for asynchronous touchscreen events
106  * @ts_data: data to pass along with key events
107  */
108 struct ipaq_micro {
109         struct device *dev;
110         void __iomem *base;
111         void __iomem *sdlc;
112         char version[5];
113         struct ipaq_micro_txdev tx;     /* transmit ISR state */
114         struct ipaq_micro_rxdev rx;     /* receive ISR state */
115         spinlock_t lock;
116         struct ipaq_micro_msg *msg;
117         struct list_head queue;
118         void (*key) (void *data, int len, unsigned char *rxdata);
119         void *key_data;
120         void (*ts) (void *data, int len, unsigned char *rxdata);
121         void *ts_data;
122 };
123 
124 extern int
125 ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg);
126 
127 static inline int
128 ipaq_micro_tx_msg_sync(struct ipaq_micro *micro,
129                        struct ipaq_micro_msg *msg)
130 {
131         int ret;
132 
133         init_completion(&msg->ack);
134         ret = ipaq_micro_tx_msg(micro, msg);
135         wait_for_completion(&msg->ack);
136 
137         return ret;
138 }
139 
140 static inline int
141 ipaq_micro_tx_msg_async(struct ipaq_micro *micro,
142                         struct ipaq_micro_msg *msg)
143 {
144         init_completion(&msg->ack);
145         return ipaq_micro_tx_msg(micro, msg);
146 }
147 
148 #endif /* _MFD_IPAQ_MICRO_H_ */
149 

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