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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* tuner-i2c.h - i2c interface for different tuners Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org) */ #ifndef __TUNER_I2C_H__ #define __TUNER_I2C_H__ #include <linux/i2c.h> #include <linux/slab.h> struct tuner_i2c_props { u8 addr; struct i2c_adapter *adap; /* used for tuner instance management */ int count; char *name; }; static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, unsigned char *buf, int len) { struct i2c_msg msg = { .addr = props->addr, .flags = 0, .buf = buf, .len = len }; int ret = i2c_transfer(props->adap, &msg, 1); return (ret == 1) ? len : ret; } static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, unsigned char *buf, int len) { struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD, .buf = buf, .len = len }; int ret = i2c_transfer(props->adap, &msg, 1); return (ret == 1) ? len : ret; } static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props, unsigned char *obuf, int olen, unsigned char *ibuf, int ilen) { struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0, .buf = obuf, .len = olen }, { .addr = props->addr, .flags = I2C_M_RD, .buf = ibuf, .len = ilen } }; int ret = i2c_transfer(props->adap, msg, 2); return (ret == 2) ? ilen : ret; } /* Callers must declare as a global for the module: * * static LIST_HEAD(hybrid_tuner_instance_list); * * hybrid_tuner_instance_list should be the third argument * passed into hybrid_tuner_request_state(). * * state structure must contain the following: * * struct list_head hybrid_tuner_instance_list; * struct tuner_i2c_props i2c_props; * * hybrid_tuner_instance_list (both within state structure and globally) * is only required if the driver is using hybrid_tuner_request_state * and hybrid_tuner_release_state to manage state sharing between * multiple instances of hybrid tuners. */ #define tuner_printk(kernlvl, i2cprops, fmt, arg...) do { \ printk(kernlvl "%s %d-%04x: " fmt, i2cprops.name, \ i2cprops.adap ? \ i2c_adapter_id(i2cprops.adap) : -1, \ i2cprops.addr, ##arg); \ } while (0) /* TO DO: convert all callers of these macros to pass in * struct tuner_i2c_props, then remove the macro wrappers */ #define __tuner_warn(i2cprops, fmt, arg...) do { \ tuner_printk(KERN_WARNING, i2cprops, fmt, ##arg); \ } while (0) #define __tuner_info(i2cprops, fmt, arg...) do { \ tuner_printk(KERN_INFO, i2cprops, fmt, ##arg); \ } while (0) #define __tuner_err(i2cprops, fmt, arg...) do { \ tuner_printk(KERN_ERR, i2cprops, fmt, ##arg); \ } while (0) #define __tuner_dbg(i2cprops, fmt, arg...) do { \ if ((debug)) \ tuner_printk(KERN_DEBUG, i2cprops, fmt, ##arg); \ } while (0) #define tuner_warn(fmt, arg...) __tuner_warn(priv->i2c_props, fmt, ##arg) #define tuner_info(fmt, arg...) __tuner_info(priv->i2c_props, fmt, ##arg) #define tuner_err(fmt, arg...) __tuner_err(priv->i2c_props, fmt, ##arg) #define tuner_dbg(fmt, arg...) __tuner_dbg(priv->i2c_props, fmt, ##arg) /****************************************************************************/ /* The return value of hybrid_tuner_request_state indicates the number of * instances using this tuner object. * * 0 - no instances, indicates an error - kzalloc must have failed * * 1 - one instance, indicates that the tuner object was created successfully * * 2 (or more) instances, indicates that an existing tuner object was found */ #define hybrid_tuner_request_state(type, state, list, i2cadap, i2caddr, devname)\ ({ \ int __ret = 0; \ list_for_each_entry(state, &list, hybrid_tuner_instance_list) { \ if (((i2cadap) && (state->i2c_props.adap)) && \ ((i2c_adapter_id(state->i2c_props.adap) == \ i2c_adapter_id(i2cadap)) && \ (i2caddr == state->i2c_props.addr))) { \ __tuner_info(state->i2c_props, \ "attaching existing instance\n"); \ state->i2c_props.count++; \ __ret = state->i2c_props.count; \ break; \ } \ } \ if (0 == __ret) { \ state = kzalloc(sizeof(type), GFP_KERNEL); \ if (!state) { \ __ret = -ENOMEM; \ goto __fail; \ } \ state->i2c_props.addr = i2caddr; \ state->i2c_props.adap = i2cadap; \ state->i2c_props.name = devname; \ __tuner_info(state->i2c_props, \ "creating new instance\n"); \ list_add_tail(&state->hybrid_tuner_instance_list, &list);\ state->i2c_props.count++; \ __ret = state->i2c_props.count; \ } \ __fail: \ __ret; \ }) #define hybrid_tuner_release_state(state) \ ({ \ int __ret; \ state->i2c_props.count--; \ __ret = state->i2c_props.count; \ if (!state->i2c_props.count) { \ __tuner_info(state->i2c_props, "destroying instance\n");\ list_del(&state->hybrid_tuner_instance_list); \ kfree(state); \ } \ __ret; \ }) #define hybrid_tuner_report_instance_count(state) \ ({ \ int __ret = 0; \ if (state) \ __ret = state->i2c_props.count; \ __ret; \ }) #endif /* __TUNER_I2C_H__ */ |