| 1 | /* |
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| 2 | ds1621.c - Part of lm_sensors, Linux kernel modules for hardware |
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| 3 | monitoring |
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| 4 | Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23 |
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| 5 | based on lm75.c by Frodo Looijaard <frodol@dds.nl> |
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| 6 | |
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| 7 | This program is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation; either version 2 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |
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| 12 | This program is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program; if not, write to the Free Software |
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| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 20 | */ |
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| 21 | |
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| 22 | /* Supports DS1621. See doc/chips/ds1621 for details */ |
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| 23 | |
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| 24 | #include <linux/version.h> |
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| 25 | #include <linux/module.h> |
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| 26 | #include <linux/slab.h> |
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| 27 | #include <linux/i2c.h> |
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| 28 | #include "sensors.h" |
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| 29 | #include "version.h" |
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| 30 | #include <linux/init.h> |
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| 31 | |
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| 32 | |
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| 33 | #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,2,18)) || \ |
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| 34 | (LINUX_VERSION_CODE == KERNEL_VERSION(2,3,0)) |
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| 35 | #define init_MUTEX(s) do { *(s) = MUTEX; } while(0) |
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| 36 | #endif |
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| 37 | |
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| 38 | #ifndef THIS_MODULE |
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| 39 | #define THIS_MODULE NULL |
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| 40 | #endif |
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| 41 | |
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| 42 | /* Addresses to scan */ |
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| 43 | static unsigned short normal_i2c[] = { SENSORS_I2C_END }; |
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| 44 | static unsigned short normal_i2c_range[] = { 0x48, 0x4f, SENSORS_I2C_END }; |
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| 45 | static unsigned int normal_isa[] = { SENSORS_ISA_END }; |
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| 46 | static unsigned int normal_isa_range[] = { SENSORS_ISA_END }; |
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| 47 | |
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| 48 | /* Insmod parameters */ |
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| 49 | SENSORS_INSMOD_1(ds1621); |
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| 50 | |
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| 51 | /* Many DS1621 constants specified below */ |
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| 52 | |
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| 53 | /* Config register used for detection */ |
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| 54 | /* 7 6 5 4 3 2 1 0 */ |
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| 55 | /* |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT| */ |
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| 56 | #define DS1621_REG_CONFIG_MASK 0x0C |
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| 57 | #define DS1621_REG_CONFIG_VAL 0x08 |
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| 58 | #define DS1621_REG_CONFIG_POLARITY 0x02 |
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| 59 | #define DS1621_REG_CONFIG_1SHOT 0x01 |
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| 60 | #define DS1621_REG_CONFIG_DONE 0x80 |
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| 61 | |
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| 62 | /* Note: the done bit is always unset if continuous conversion is in progress. |
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| 63 | We need to stop the continuous conversion or switch to single shot |
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| 64 | before this bit becomes available! |
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| 65 | */ |
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| 66 | |
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| 67 | /* The DS1621 registers */ |
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| 68 | #define DS1621_REG_TEMP 0xAA /* word, RO */ |
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| 69 | #define DS1621_REG_TEMP_OVER 0xA1 /* word, RW */ |
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| 70 | #define DS1621_REG_TEMP_HYST 0xA2 /* word, RW -- it's a low temp trigger */ |
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| 71 | #define DS1621_REG_CONF 0xAC /* byte, RW */ |
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| 72 | #define DS1621_REG_TEMP_COUNTER 0xA8 /* byte, RO */ |
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| 73 | #define DS1621_REG_TEMP_SLOPE 0xA9 /* byte, RO */ |
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| 74 | #define DS1621_COM_START 0xEE /* no data */ |
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| 75 | #define DS1621_COM_STOP 0x22 /* no data */ |
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| 76 | |
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| 77 | /* Conversions. Rounding and limit checking is only done on the TO_REG |
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| 78 | variants. Note that you should be a bit careful with which arguments |
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| 79 | these macros are called: arguments may be evaluated more than once. |
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| 80 | Fixing this is just not worth it. */ |
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| 81 | #define TEMP_FROM_REG(val) ((((val & 0x7fff) >> 7) * 5) | \ |
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| 82 | ((val & 0x8000)?-256:0)) |
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| 83 | #define TEMP_TO_REG(val) (SENSORS_LIMIT((val<0 ? (0x200+((val)/5))<<7 : \ |
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| 84 | (((val) + 2) / 5) << 7),0,0xffff)) |
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| 85 | #define ALARMS_FROM_REG(val) ((val) & \ |
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| 86 | (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW)) |
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| 87 | #define ITEMP_FROM_REG(val) ((((val & 0x7fff) >> 8)) | \ |
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| 88 | ((val & 0x8000)?-256:0)) |
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| 89 | |
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| 90 | /* Initial values */ |
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| 91 | #define DS1621_INIT_TEMP_OVER 600 |
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| 92 | #define DS1621_INIT_TEMP_HYST 0 /* 500 would cause an alarm at room temp. */ |
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| 93 | |
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| 94 | /* Each client has this additional data */ |
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| 95 | struct ds1621_data { |
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| 96 | int sysctl_id; |
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| 97 | |
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| 98 | struct semaphore update_lock; |
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| 99 | char valid; /* !=0 if following fields are valid */ |
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| 100 | unsigned long last_updated; /* In jiffies */ |
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| 101 | |
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| 102 | u16 temp, temp_over, temp_hyst; /* Register values, word */ |
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| 103 | u8 conf; /* Register encoding, combined */ |
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| 104 | |
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| 105 | char enable; /* !=0 if we're expected to restart the conversion */ |
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| 106 | u8 temp_int, temp_counter, temp_slope; /* Register values, byte */ |
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| 107 | }; |
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| 108 | |
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| 109 | #ifdef MODULE |
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| 110 | extern int init_module(void); |
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| 111 | extern int cleanup_module(void); |
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| 112 | #endif /* MODULE */ |
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| 113 | |
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| 114 | #ifdef MODULE |
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| 115 | static |
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| 116 | #else |
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| 117 | extern |
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| 118 | #endif |
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| 119 | int __init sensors_ds1621_init(void); |
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| 120 | static int __init ds1621_cleanup(void); |
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| 121 | static int ds1621_attach_adapter(struct i2c_adapter *adapter); |
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| 122 | static int ds1621_detect(struct i2c_adapter *adapter, int address, |
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| 123 | unsigned short flags, int kind); |
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| 124 | static void ds1621_init_client(struct i2c_client *client); |
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| 125 | static int ds1621_detach_client(struct i2c_client *client); |
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| 126 | static int ds1621_command(struct i2c_client *client, unsigned int cmd, |
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| 127 | void *arg); |
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| 128 | static void ds1621_inc_use(struct i2c_client *client); |
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| 129 | static void ds1621_dec_use(struct i2c_client *client); |
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| 130 | static u16 swap_bytes(u16 val); |
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| 131 | static int ds1621_read_value(struct i2c_client *client, u8 reg); |
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| 132 | static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value); |
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| 133 | static void ds1621_temp(struct i2c_client *client, int operation, |
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| 134 | int ctl_name, int *nrels_mag, long *results); |
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| 135 | static void ds1621_alarms(struct i2c_client *client, int operation, |
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| 136 | int ctl_name, int *nrels_mag, long *results); |
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| 137 | static void ds1621_enable(struct i2c_client *client, int operation, |
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| 138 | int ctl_name, int *nrels_mag, long *results); |
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| 139 | static void ds1621_continuous(struct i2c_client *client, int operation, |
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| 140 | int ctl_name, int *nrels_mag, long *results); |
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| 141 | static void ds1621_polarity(struct i2c_client *client, int operation, |
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| 142 | int ctl_name, int *nrels_mag, long *results); |
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| 143 | static void ds1621_update_client(struct i2c_client *client); |
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| 144 | |
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| 145 | |
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| 146 | /* This is the driver that will be inserted */ |
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| 147 | static struct i2c_driver ds1621_driver = { |
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| 148 | /* name */ "DS1621 sensor driver", |
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| 149 | /* id */ I2C_DRIVERID_DS1621, |
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| 150 | /* flags */ I2C_DF_NOTIFY, |
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| 151 | /* attach_adapter */ &ds1621_attach_adapter, |
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| 152 | /* detach_client */ &ds1621_detach_client, |
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| 153 | /* command */ &ds1621_command, |
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| 154 | /* inc_use */ &ds1621_inc_use, |
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| 155 | /* dec_use */ &ds1621_dec_use |
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| 156 | }; |
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| 157 | |
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| 158 | /* These files are created for each detected DS1621. This is just a template; |
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| 159 | though at first sight, you might think we could use a statically |
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| 160 | allocated list, we need some way to get back to the parent - which |
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| 161 | is done through one of the 'extra' fields which are initialized |
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| 162 | when a new copy is allocated. */ |
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| 163 | static ctl_table ds1621_dir_table_template[] = { |
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| 164 | {DS1621_SYSCTL_TEMP, "temp", NULL, 0, 0644, NULL, |
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| 165 | &i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_temp}, |
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| 166 | {DS1621_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL, |
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| 167 | &i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_alarms}, |
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| 168 | {DS1621_SYSCTL_ENABLE, "enable", NULL, 0, 0644, NULL, |
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| 169 | &i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_enable}, |
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| 170 | {DS1621_SYSCTL_CONTINUOUS, "continuous", NULL, 0, 0644, NULL, |
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| 171 | &i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_continuous}, |
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| 172 | {DS1621_SYSCTL_POLARITY, "polarity", NULL, 0, 0644, NULL, |
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| 173 | &i2c_proc_real, &i2c_sysctl_real, NULL, &ds1621_polarity}, |
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| 174 | {0} |
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| 175 | }; |
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| 176 | |
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| 177 | /* Used by init/cleanup */ |
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| 178 | static int __initdata ds1621_initialized = 0; |
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| 179 | |
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| 180 | static int ds1621_id = 0; |
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| 181 | |
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| 182 | int ds1621_attach_adapter(struct i2c_adapter *adapter) |
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| 183 | { |
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| 184 | return i2c_detect(adapter, &addr_data, ds1621_detect); |
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| 185 | } |
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| 186 | |
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| 187 | /* This function is called by i2c_detect */ |
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| 188 | int ds1621_detect(struct i2c_adapter *adapter, int address, |
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| 189 | unsigned short flags, int kind) |
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| 190 | { |
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| 191 | int i, conf; |
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| 192 | struct i2c_client *new_client; |
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| 193 | struct ds1621_data *data; |
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| 194 | int err = 0; |
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| 195 | const char *type_name, *client_name; |
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| 196 | |
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| 197 | /* Make sure we aren't probing the ISA bus!! This is just a safety check |
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| 198 | at this moment; i2c_detect really won't call us. */ |
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| 199 | #ifdef DEBUG |
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| 200 | if (i2c_is_isa_adapter(adapter)) { |
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| 201 | printk |
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| 202 | ("ds1621.o: ds1621_detect called for an ISA bus adapter?!?\n"); |
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| 203 | return 0; |
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| 204 | } |
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| 205 | #endif |
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| 206 | |
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| 207 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
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| 208 | I2C_FUNC_SMBUS_WORD_DATA)) |
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| 209 | goto ERROR0; |
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| 210 | |
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| 211 | /* OK. For now, we presume we have a valid client. We now create the |
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| 212 | client structure, even though we cannot fill it completely yet. |
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| 213 | But it allows us to access ds1621_{read,write}_value. */ |
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| 214 | if (!(new_client = kmalloc(sizeof(struct i2c_client) + |
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| 215 | sizeof(struct ds1621_data), |
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| 216 | GFP_KERNEL))) { |
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| 217 | err = -ENOMEM; |
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| 218 | goto ERROR0; |
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| 219 | } |
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| 220 | |
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| 221 | data = (struct ds1621_data *) (new_client + 1); |
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| 222 | new_client->addr = address; |
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| 223 | new_client->data = data; |
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| 224 | new_client->adapter = adapter; |
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| 225 | new_client->driver = &ds1621_driver; |
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| 226 | new_client->flags = 0; |
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| 227 | |
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| 228 | /* Now, we do the remaining detection. It is lousy. */ |
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| 229 | if (kind < 0) { |
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| 230 | conf = i2c_smbus_read_byte_data(new_client, |
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| 231 | DS1621_REG_CONF); |
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| 232 | if ((conf & DS1621_REG_CONFIG_MASK) |
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| 233 | != DS1621_REG_CONFIG_VAL) |
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| 234 | goto ERROR1; |
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| 235 | } |
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| 236 | |
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| 237 | /* Determine the chip type - only one kind supported! */ |
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| 238 | if (kind <= 0) |
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| 239 | kind = ds1621; |
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| 240 | |
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| 241 | if (kind == ds1621) { |
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| 242 | type_name = "ds1621"; |
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| 243 | client_name = "DS1621 chip"; |
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| 244 | } else { |
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| 245 | #ifdef DEBUG |
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| 246 | printk("ds1621.o: Internal error: unknown kind (%d)?!?", |
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| 247 | kind); |
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| 248 | #endif |
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| 249 | goto ERROR1; |
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| 250 | } |
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| 251 | |
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| 252 | /* Fill in remaining client fields and put it into the global list */ |
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| 253 | strcpy(new_client->name, client_name); |
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| 254 | |
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| 255 | new_client->id = ds1621_id++; |
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| 256 | data->valid = 0; |
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| 257 | init_MUTEX(&data->update_lock); |
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| 258 | |
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| 259 | /* Tell the I2C layer a new client has arrived */ |
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| 260 | if ((err = i2c_attach_client(new_client))) |
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| 261 | goto ERROR3; |
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| 262 | |
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| 263 | /* Register a new directory entry with module sensors */ |
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| 264 | if ((i = i2c_register_entry(new_client, type_name, |
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| 265 | ds1621_dir_table_template, |
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| 266 | THIS_MODULE)) < 0) { |
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| 267 | err = i; |
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| 268 | goto ERROR4; |
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| 269 | } |
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| 270 | data->sysctl_id = i; |
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| 271 | |
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| 272 | ds1621_init_client(new_client); |
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| 273 | return 0; |
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| 274 | |
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| 275 | /* OK, this is not exactly good programming practice, usually. But it is |
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| 276 | very code-efficient in this case. */ |
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| 277 | |
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| 278 | ERROR4: |
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| 279 | i2c_detach_client(new_client); |
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| 280 | ERROR3: |
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| 281 | ERROR1: |
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| 282 | kfree(new_client); |
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| 283 | ERROR0: |
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| 284 | return err; |
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| 285 | } |
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| 286 | |
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| 287 | int ds1621_detach_client(struct i2c_client *client) |
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| 288 | { |
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| 289 | int err; |
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| 290 | |
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| 291 | #ifdef MODULE |
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| 292 | if (MOD_IN_USE) |
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| 293 | return -EBUSY; |
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| 294 | #endif |
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| 295 | |
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| 296 | |
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| 297 | i2c_deregister_entry(((struct ds1621_data *) (client->data))-> |
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| 298 | sysctl_id); |
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| 299 | |
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| 300 | if ((err = i2c_detach_client(client))) { |
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| 301 | printk |
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| 302 | ("ds1621.o: Client deregistration failed, client not detached.\n"); |
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| 303 | return err; |
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| 304 | } |
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| 305 | |
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| 306 | kfree(client); |
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| 307 | |
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| 308 | return 0; |
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| 309 | } |
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| 310 | |
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| 311 | |
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| 312 | /* No commands defined yet */ |
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| 313 | int ds1621_command(struct i2c_client *client, unsigned int cmd, void *arg) |
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| 314 | { |
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| 315 | return 0; |
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| 316 | } |
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| 317 | |
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| 318 | /* Nothing here yet */ |
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| 319 | void ds1621_inc_use(struct i2c_client *client) |
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| 320 | { |
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| 321 | #ifdef MODULE |
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| 322 | MOD_INC_USE_COUNT; |
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| 323 | #endif |
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| 324 | } |
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| 325 | |
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| 326 | /* Nothing here yet */ |
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| 327 | void ds1621_dec_use(struct i2c_client *client) |
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| 328 | { |
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| 329 | #ifdef MODULE |
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| 330 | MOD_DEC_USE_COUNT; |
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| 331 | #endif |
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| 332 | } |
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| 333 | |
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| 334 | u16 swap_bytes(u16 val) |
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| 335 | { |
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| 336 | return (val >> 8) | (val << 8); |
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| 337 | } |
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| 338 | |
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| 339 | /* All registers are word-sized, except for the configuration register. |
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| 340 | DS1621 uses a high-byte first convention, which is exactly opposite to |
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| 341 | the usual practice. */ |
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| 342 | int ds1621_read_value(struct i2c_client *client, u8 reg) |
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| 343 | { |
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| 344 | if ((reg == DS1621_REG_CONF) || (reg == DS1621_REG_TEMP_COUNTER) |
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| 345 | || (reg == DS1621_REG_TEMP_SLOPE)) |
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| 346 | return i2c_smbus_read_byte_data(client, reg); |
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| 347 | else |
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| 348 | return swap_bytes(i2c_smbus_read_word_data(client, reg)); |
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| 349 | } |
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| 350 | |
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| 351 | /* All registers are word-sized, except for the configuration register. |
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| 352 | DS1621 uses a high-byte first convention, which is exactly opposite to |
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| 353 | the usual practice. */ |
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| 354 | int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value) |
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| 355 | { |
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| 356 | if ((reg == DS1621_REG_CONF) || (reg == DS1621_REG_TEMP_COUNTER) |
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| 357 | || (reg == DS1621_REG_TEMP_SLOPE)) |
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| 358 | return i2c_smbus_write_byte_data(client, reg, value); |
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| 359 | else |
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| 360 | return i2c_smbus_write_word_data(client, reg, |
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| 361 | swap_bytes(value)); |
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| 362 | } |
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| 363 | |
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| 364 | void ds1621_init_client(struct i2c_client *client) |
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| 365 | { |
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| 366 | /* Initialize the DS1621 chip */ |
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| 367 | ds1621_write_value(client, DS1621_REG_TEMP_OVER, |
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| 368 | TEMP_TO_REG(DS1621_INIT_TEMP_OVER)); |
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| 369 | ds1621_write_value(client, DS1621_REG_TEMP_HYST, |
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| 370 | TEMP_TO_REG(DS1621_INIT_TEMP_HYST)); |
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| 371 | ds1621_write_value(client, DS1621_REG_CONF, 0); |
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| 372 | |
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| 373 | /* perhaps we should start the continous conversion? For now */ |
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| 374 | /* you got to do that yourself using the "enable" in proc */ |
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| 375 | } |
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| 376 | |
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| 377 | void ds1621_update_client(struct i2c_client *client) |
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| 378 | { |
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| 379 | struct ds1621_data *data = client->data; |
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| 380 | u8 new_conf; |
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| 381 | |
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| 382 | down(&data->update_lock); |
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| 383 | |
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| 384 | if ((jiffies - data->last_updated > HZ + HZ / 2) || |
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| 385 | (jiffies < data->last_updated) || !data->valid) { |
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| 386 | |
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| 387 | #ifdef DEBUG |
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| 388 | printk("Starting ds1621 update\n"); |
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| 389 | #endif |
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| 390 | |
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| 391 | data->conf = ds1621_read_value(client, DS1621_REG_CONF); |
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| 392 | |
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| 393 | data->temp = ds1621_read_value(client, |
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| 394 | DS1621_REG_TEMP); |
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| 395 | data->temp_over = ds1621_read_value(client, |
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| 396 | DS1621_REG_TEMP_OVER); |
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| 397 | data->temp_hyst = ds1621_read_value(client, |
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| 398 | DS1621_REG_TEMP_HYST); |
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| 399 | |
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| 400 | /* wait for the DONE bit before reading extended values */ |
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| 401 | |
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| 402 | if (data->conf & DS1621_REG_CONFIG_DONE) { |
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| 403 | data->temp_counter = ds1621_read_value(client, |
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| 404 | DS1621_REG_TEMP_COUNTER); |
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| 405 | data->temp_slope = ds1621_read_value(client, |
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| 406 | DS1621_REG_TEMP_SLOPE); |
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| 407 | data->temp_int = ITEMP_FROM_REG(data->temp); |
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| 408 | /* restart the conversion */ |
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| 409 | if (data->enable) |
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| 410 | ds1621_read_value(client, DS1621_COM_START); |
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| 411 | } |
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| 412 | |
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| 413 | /* reset alarms if neccessary */ |
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| 414 | new_conf = data->conf; |
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| 415 | if (data->temp < data->temp_over) |
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| 416 | new_conf &= ~DS1621_ALARM_TEMP_HIGH; |
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| 417 | if (data->temp > data->temp_hyst) |
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| 418 | new_conf &= ~DS1621_ALARM_TEMP_LOW; |
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| 419 | if (data->conf != new_conf) |
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| 420 | ds1621_write_value(client, DS1621_REG_CONF, |
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| 421 | new_conf); |
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| 422 | |
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| 423 | data->last_updated = jiffies; |
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| 424 | data->valid = 1; |
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| 425 | } |
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| 426 | |
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| 427 | up(&data->update_lock); |
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| 428 | } |
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| 429 | |
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| 430 | |
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| 431 | void ds1621_temp(struct i2c_client *client, int operation, int ctl_name, |
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| 432 | int *nrels_mag, long *results) |
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| 433 | { |
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| 434 | struct ds1621_data *data = client->data; |
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| 435 | if (operation == SENSORS_PROC_REAL_INFO) |
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| 436 | if (!(data->conf & DS1621_REG_CONFIG_DONE) || |
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| 437 | (data->temp_counter > data->temp_slope) || |
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| 438 | (data->temp_slope == 0)) { |
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| 439 | *nrels_mag = 1; |
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| 440 | } else { |
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| 441 | *nrels_mag = 2; |
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| 442 | } |
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| 443 | else if (operation == SENSORS_PROC_REAL_READ) { |
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| 444 | ds1621_update_client(client); |
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| 445 | /* decide wether to calculate more precise temp */ |
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| 446 | if (!(data->conf & DS1621_REG_CONFIG_DONE) || |
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| 447 | (data->temp_counter > data->temp_slope) || |
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| 448 | (data->temp_slope == 0)) { |
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| 449 | results[0] = TEMP_FROM_REG(data->temp_over); |
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| 450 | results[1] = TEMP_FROM_REG(data->temp_hyst); |
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| 451 | results[2] = TEMP_FROM_REG(data->temp); |
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| 452 | } else { |
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| 453 | results[0] = TEMP_FROM_REG(data->temp_over)*10; |
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| 454 | results[1] = TEMP_FROM_REG(data->temp_hyst)*10; |
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| 455 | results[2] = data->temp_int * 100 - 25 + |
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| 456 | ((data->temp_slope - data->temp_counter) * |
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| 457 | 100 / data->temp_slope); |
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| 458 | } |
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| 459 | *nrels_mag = 3; |
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| 460 | } else if (operation == SENSORS_PROC_REAL_WRITE) { |
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| 461 | if (*nrels_mag >= 1) { |
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| 462 | data->temp_over = TEMP_TO_REG(results[0]); |
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| 463 | ds1621_write_value(client, DS1621_REG_TEMP_OVER, |
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| 464 | data->temp_over); |
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| 465 | } |
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| 466 | if (*nrels_mag >= 2) { |
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| 467 | data->temp_hyst = TEMP_TO_REG(results[1]); |
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| 468 | ds1621_write_value(client, DS1621_REG_TEMP_HYST, |
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| 469 | data->temp_hyst); |
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| 470 | } |
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| 471 | } |
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| 472 | } |
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| 473 | |
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| 474 | void ds1621_alarms(struct i2c_client *client, int operation, int ctl_name, |
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| 475 | int *nrels_mag, long *results) |
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| 476 | { |
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| 477 | struct ds1621_data *data = client->data; |
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| 478 | if (operation == SENSORS_PROC_REAL_INFO) |
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| 479 | *nrels_mag = 0; |
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| 480 | else if (operation == SENSORS_PROC_REAL_READ) { |
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| 481 | ds1621_update_client(client); |
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| 482 | results[0] = ALARMS_FROM_REG(data->conf); |
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| 483 | *nrels_mag = 1; |
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| 484 | } |
|---|
| 485 | } |
|---|
| 486 | |
|---|
| 487 | void ds1621_enable(struct i2c_client *client, int operation, int ctl_name, |
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| 488 | int *nrels_mag, long *results) |
|---|
| 489 | { |
|---|
| 490 | /* If you really screw up your chip (like I did) this is */ |
|---|
| 491 | /* sometimes needed to (re)start the continous conversion */ |
|---|
| 492 | /* there is no data to read so this might hang your SMBus! */ |
|---|
| 493 | |
|---|
| 494 | struct ds1621_data *data = client->data; |
|---|
| 495 | if (operation == SENSORS_PROC_REAL_INFO) |
|---|
| 496 | *nrels_mag = 0; |
|---|
| 497 | else if (operation == SENSORS_PROC_REAL_READ) { |
|---|
| 498 | ds1621_update_client(client); |
|---|
| 499 | results[0] = !(data->conf & DS1621_REG_CONFIG_DONE); |
|---|
| 500 | *nrels_mag = 1; |
|---|
| 501 | } else if (operation == SENSORS_PROC_REAL_WRITE) { |
|---|
| 502 | if (*nrels_mag >= 1) { |
|---|
| 503 | if (results[0]) { |
|---|
| 504 | ds1621_read_value(client, DS1621_COM_START); |
|---|
| 505 | data->enable=1; |
|---|
| 506 | } else { |
|---|
| 507 | ds1621_read_value(client, DS1621_COM_STOP); |
|---|
| 508 | data->enable=0; |
|---|
| 509 | } |
|---|
| 510 | } else { |
|---|
| 511 | ds1621_read_value(client, DS1621_COM_START); |
|---|
| 512 | data->enable=1; |
|---|
| 513 | } |
|---|
| 514 | } |
|---|
| 515 | } |
|---|
| 516 | |
|---|
| 517 | void ds1621_continuous(struct i2c_client *client, int operation, int ctl_name, |
|---|
| 518 | int *nrels_mag, long *results) |
|---|
| 519 | { |
|---|
| 520 | struct ds1621_data *data = client->data; |
|---|
| 521 | if (operation == SENSORS_PROC_REAL_INFO) |
|---|
| 522 | *nrels_mag = 0; |
|---|
| 523 | else if (operation == SENSORS_PROC_REAL_READ) { |
|---|
| 524 | ds1621_update_client(client); |
|---|
| 525 | results[0] = !(data->conf & DS1621_REG_CONFIG_1SHOT); |
|---|
| 526 | *nrels_mag = 1; |
|---|
| 527 | } else if (operation == SENSORS_PROC_REAL_WRITE) { |
|---|
| 528 | ds1621_update_client(client); |
|---|
| 529 | if (*nrels_mag >= 1) { |
|---|
| 530 | if (results[0]) { |
|---|
| 531 | ds1621_write_value(client, DS1621_REG_CONF, |
|---|
| 532 | data->conf & ~DS1621_REG_CONFIG_1SHOT); |
|---|
| 533 | } else { |
|---|
| 534 | ds1621_write_value(client, DS1621_REG_CONF, |
|---|
| 535 | data->conf | DS1621_REG_CONFIG_1SHOT); |
|---|
| 536 | } |
|---|
| 537 | } else { |
|---|
| 538 | ds1621_write_value(client, DS1621_REG_CONF, |
|---|
| 539 | data->conf & ~DS1621_REG_CONFIG_1SHOT); |
|---|
| 540 | } |
|---|
| 541 | } |
|---|
| 542 | } |
|---|
| 543 | |
|---|
| 544 | void ds1621_polarity(struct i2c_client *client, int operation, int ctl_name, |
|---|
| 545 | int *nrels_mag, long *results) |
|---|
| 546 | { |
|---|
| 547 | struct ds1621_data *data = client->data; |
|---|
| 548 | if (operation == SENSORS_PROC_REAL_INFO) |
|---|
| 549 | *nrels_mag = 0; |
|---|
| 550 | else if (operation == SENSORS_PROC_REAL_READ) { |
|---|
| 551 | ds1621_update_client(client); |
|---|
| 552 | results[0] = !(!(data->conf & DS1621_REG_CONFIG_POLARITY)); |
|---|
| 553 | *nrels_mag = 1; |
|---|
| 554 | } else if (operation == SENSORS_PROC_REAL_WRITE) { |
|---|
| 555 | ds1621_update_client(client); |
|---|
| 556 | if (*nrels_mag >= 1) { |
|---|
| 557 | if (results[0]) { |
|---|
| 558 | ds1621_write_value(client, DS1621_REG_CONF, |
|---|
| 559 | data->conf | DS1621_REG_CONFIG_POLARITY); |
|---|
| 560 | } else { |
|---|
| 561 | ds1621_write_value(client, DS1621_REG_CONF, |
|---|
| 562 | data->conf & ~DS1621_REG_CONFIG_POLARITY); |
|---|
| 563 | } |
|---|
| 564 | } |
|---|
| 565 | } |
|---|
| 566 | } |
|---|
| 567 | |
|---|
| 568 | int __init sensors_ds1621_init(void) |
|---|
| 569 | { |
|---|
| 570 | int res; |
|---|
| 571 | |
|---|
| 572 | printk("ds1621.o version %s (%s)\n", LM_VERSION, LM_DATE); |
|---|
| 573 | ds1621_initialized = 0; |
|---|
| 574 | if ((res = i2c_add_driver(&ds1621_driver))) { |
|---|
| 575 | printk |
|---|
| 576 | ("ds1621.o: Driver registration failed, module not inserted.\n"); |
|---|
| 577 | ds1621_cleanup(); |
|---|
| 578 | return res; |
|---|
| 579 | } |
|---|
| 580 | ds1621_initialized++; |
|---|
| 581 | return 0; |
|---|
| 582 | } |
|---|
| 583 | |
|---|
| 584 | int __init ds1621_cleanup(void) |
|---|
| 585 | { |
|---|
| 586 | int res; |
|---|
| 587 | |
|---|
| 588 | if (ds1621_initialized >= 1) { |
|---|
| 589 | if ((res = i2c_del_driver(&ds1621_driver))) { |
|---|
| 590 | printk |
|---|
| 591 | ("ds1621.o: Driver deregistration failed, module not removed.\n"); |
|---|
| 592 | return res; |
|---|
| 593 | } |
|---|
| 594 | ds1621_initialized--; |
|---|
| 595 | } |
|---|
| 596 | |
|---|
| 597 | return 0; |
|---|
| 598 | } |
|---|
| 599 | |
|---|
| 600 | EXPORT_NO_SYMBOLS; |
|---|
| 601 | |
|---|
| 602 | #ifdef MODULE |
|---|
| 603 | |
|---|
| 604 | MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>"); |
|---|
| 605 | MODULE_DESCRIPTION("DS1621 driver"); |
|---|
| 606 | |
|---|
| 607 | int init_module(void) |
|---|
| 608 | { |
|---|
| 609 | return sensors_ds1621_init(); |
|---|
| 610 | } |
|---|
| 611 | |
|---|
| 612 | int cleanup_module(void) |
|---|
| 613 | { |
|---|
| 614 | return ds1621_cleanup(); |
|---|
| 615 | } |
|---|
| 616 | |
|---|
| 617 | #endif /* MODULE */ |
|---|