// SPDX-License-Identifier: GPL-2.0+ // // em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices // // Copyright (C) 2005 Ludovico Cavedon <[email protected]> // Markus Rechberger <[email protected]> // Mauro Carvalho Chehab <[email protected]> // Sascha Sommer <[email protected]> // Copyright (C) 2013 Frank Schäfer <[email protected]> #include "em28xx.h" #include <linux/module.h> #include <linux/kernel.h> #include <linux/usb.h> #include <linux/i2c.h> #include <linux/jiffies.h> #include "xc2028.h" #include <media/v4l2-common.h> #include <media/tuner.h> /* ----------------------------------------------------------- */ static unsigned int i2c_scan; module_param(i2c_scan, int, 0444); MODULE_PARM_DESC(…) …; static unsigned int i2c_debug; module_param(i2c_debug, int, 0644); MODULE_PARM_DESC(…) …; #define dprintk(level, fmt, arg...) … /* * Time in msecs to wait for i2c xfers to finish. * 35ms is the maximum time a SMBUS device could wait when * clock stretching is used. As the transfer itself will take * some time to happen, set it to 35 ms. * * Ok, I2C doesn't specify any limit. So, eventually, we may need * to increase this timeout. */ #define EM28XX_I2C_XFER_TIMEOUT … static int em28xx_i2c_timeout(struct em28xx *dev) { … } /* * em2800_i2c_send_bytes() * send up to 4 bytes to the em2800 i2c device */ static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) { … } /* * em2800_i2c_recv_bytes() * read up to 4 bytes from the em2800 i2c device */ static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) { … } /* * em2800_i2c_check_for_device() * check if there is an i2c device at the supplied address */ static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr) { … } /* * em28xx_i2c_send_bytes() */ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len, int stop) { … } /* * em28xx_i2c_recv_bytes() * read a byte from the i2c device */ static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len) { … } /* * em28xx_i2c_check_for_device() * check if there is a i2c_device at the supplied address */ static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr) { … } /* * em25xx_bus_B_send_bytes * write bytes to the i2c device */ static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len) { … } /* * em25xx_bus_B_recv_bytes * read bytes from the i2c device */ static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len) { … } /* * em25xx_bus_B_check_for_device() * check if there is a i2c device at the supplied address */ static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr) { … } static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr) { … } static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus, struct i2c_msg msg) { … } static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus, struct i2c_msg msg, int stop) { … } /* * em28xx_i2c_xfer() * the main i2c transfer function */ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) { … } /* * based on linux/sunrpc/svcauth.h and linux/hash.h * The original hash function returns a different value, if arch is x86_64 * or i386. */ static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits) { … } /* * Helper function to read data blocks from i2c clients with 8 or 16 bit * address width, 8 bit register width and auto incrementation been activated */ static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr, bool addr_w16, u16 len, u8 *data) { … } static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus, u8 **eedata, u16 *eedata_len) { … } /* ----------------------------------------------------------- */ /* * functionality() */ static u32 functionality(struct i2c_adapter *i2c_adap) { … } static const struct i2c_algorithm em28xx_algo = …; static const struct i2c_adapter em28xx_adap_template = …; static const struct i2c_client em28xx_client_template = …; /* ----------------------------------------------------------- */ /* * i2c_devs * incomplete list of known devices */ static char *i2c_devs[128] = …; /* * do_i2c_scan() * check i2c address range for devices */ void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus) { … } /* * em28xx_i2c_register() * register i2c bus */ int em28xx_i2c_register(struct em28xx *dev, unsigned int bus, enum em28xx_i2c_algo_type algo_type) { … } /* * em28xx_i2c_unregister() * unregister i2c_bus */ int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus) { … }
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