David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1 | /* |
| 2 | * rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips. |
| 3 | * |
| 4 | * Copyright (C) 2005 James Chapman (ds1337 core) |
| 5 | * Copyright (C) 2006 David Brownell |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 6 | * Copyright (C) 2009 Matthias Fuchs (rx8025 support) |
Bertrand Achard | bc48b90 | 2013-04-29 16:19:26 -0700 | [diff] [blame] | 7 | * Copyright (C) 2012 Bertrand Achard (nvram access fixes) |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/rtc.h> |
| 20 | #include <linux/bcd.h> |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 21 | #include <linux/rtc/ds1307.h> |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 22 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 23 | /* |
| 24 | * We can't determine type by probing, but if we expect pre-Linux code |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 25 | * to have set the chip up as a clock (turning on the oscillator and |
| 26 | * setting the date and time), Linux can ignore the non-clock features. |
| 27 | * That's a natural job for a factory or repair bench. |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 28 | */ |
| 29 | enum ds_type { |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 30 | ds_1307, |
| 31 | ds_1337, |
| 32 | ds_1338, |
| 33 | ds_1339, |
| 34 | ds_1340, |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 35 | ds_1388, |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 36 | ds_3231, |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 37 | m41t00, |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 38 | mcp7941x, |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 39 | rx_8025, |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 40 | last_ds_type /* always last */ |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 41 | /* rs5c372 too? different address... */ |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 42 | }; |
| 43 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 44 | |
| 45 | /* RTC registers don't differ much, except for the century flag */ |
| 46 | #define DS1307_REG_SECS 0x00 /* 00-59 */ |
| 47 | # define DS1307_BIT_CH 0x80 |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 48 | # define DS1340_BIT_nEOSC 0x80 |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 49 | # define MCP7941X_BIT_ST 0x80 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 50 | #define DS1307_REG_MIN 0x01 /* 00-59 */ |
| 51 | #define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */ |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 52 | # define DS1307_BIT_12HR 0x40 /* in REG_HOUR */ |
| 53 | # define DS1307_BIT_PM 0x20 /* in REG_HOUR */ |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 54 | # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ |
| 55 | # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ |
| 56 | #define DS1307_REG_WDAY 0x03 /* 01-07 */ |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 57 | # define MCP7941X_BIT_VBATEN 0x08 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 58 | #define DS1307_REG_MDAY 0x04 /* 01-31 */ |
| 59 | #define DS1307_REG_MONTH 0x05 /* 01-12 */ |
| 60 | # define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */ |
| 61 | #define DS1307_REG_YEAR 0x06 /* 00-99 */ |
| 62 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 63 | /* |
| 64 | * Other registers (control, status, alarms, trickle charge, NVRAM, etc) |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 65 | * start at 7, and they differ a LOT. Only control and status matter for |
| 66 | * basic RTC date and time functionality; be careful using them. |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 67 | */ |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 68 | #define DS1307_REG_CONTROL 0x07 /* or ds1338 */ |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 69 | # define DS1307_BIT_OUT 0x80 |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 70 | # define DS1338_BIT_OSF 0x20 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 71 | # define DS1307_BIT_SQWE 0x10 |
| 72 | # define DS1307_BIT_RS1 0x02 |
| 73 | # define DS1307_BIT_RS0 0x01 |
| 74 | #define DS1337_REG_CONTROL 0x0e |
| 75 | # define DS1337_BIT_nEOSC 0x80 |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 76 | # define DS1339_BIT_BBSQI 0x20 |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 77 | # define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */ |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 78 | # define DS1337_BIT_RS2 0x10 |
| 79 | # define DS1337_BIT_RS1 0x08 |
| 80 | # define DS1337_BIT_INTCN 0x04 |
| 81 | # define DS1337_BIT_A2IE 0x02 |
| 82 | # define DS1337_BIT_A1IE 0x01 |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 83 | #define DS1340_REG_CONTROL 0x07 |
| 84 | # define DS1340_BIT_OUT 0x80 |
| 85 | # define DS1340_BIT_FT 0x40 |
| 86 | # define DS1340_BIT_CALIB_SIGN 0x20 |
| 87 | # define DS1340_M_CALIBRATION 0x1f |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 88 | #define DS1340_REG_FLAG 0x09 |
| 89 | # define DS1340_BIT_OSF 0x80 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 90 | #define DS1337_REG_STATUS 0x0f |
| 91 | # define DS1337_BIT_OSF 0x80 |
| 92 | # define DS1337_BIT_A2I 0x02 |
| 93 | # define DS1337_BIT_A1I 0x01 |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 94 | #define DS1339_REG_ALARM1_SECS 0x07 |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 95 | |
| 96 | #define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 97 | |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 98 | #define RX8025_REG_CTRL1 0x0e |
| 99 | # define RX8025_BIT_2412 0x20 |
| 100 | #define RX8025_REG_CTRL2 0x0f |
| 101 | # define RX8025_BIT_PON 0x10 |
| 102 | # define RX8025_BIT_VDET 0x40 |
| 103 | # define RX8025_BIT_XST 0x20 |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 104 | |
| 105 | |
| 106 | struct ds1307 { |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 107 | u8 offset; /* register's offset */ |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 108 | u8 regs[11]; |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 109 | u16 nvram_offset; |
| 110 | struct bin_attribute *nvram; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 111 | enum ds_type type; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 112 | unsigned long flags; |
| 113 | #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ |
| 114 | #define HAS_ALARM 1 /* bit 1 == irq claimed */ |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 115 | struct i2c_client *client; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 116 | struct rtc_device *rtc; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 117 | struct work_struct work; |
Jean Delvare | 0cc43a1 | 2011-01-10 22:11:23 +0100 | [diff] [blame] | 118 | s32 (*read_block_data)(const struct i2c_client *client, u8 command, |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 119 | u8 length, u8 *values); |
Jean Delvare | 0cc43a1 | 2011-01-10 22:11:23 +0100 | [diff] [blame] | 120 | s32 (*write_block_data)(const struct i2c_client *client, u8 command, |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 121 | u8 length, const u8 *values); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 122 | }; |
| 123 | |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 124 | struct chip_desc { |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 125 | unsigned alarm:1; |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 126 | u16 nvram_offset; |
| 127 | u16 nvram_size; |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 128 | u16 trickle_charger_reg; |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 129 | }; |
| 130 | |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 131 | static const struct chip_desc chips[last_ds_type] = { |
| 132 | [ds_1307] = { |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 133 | .nvram_offset = 8, |
| 134 | .nvram_size = 56, |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 135 | }, |
| 136 | [ds_1337] = { |
| 137 | .alarm = 1, |
| 138 | }, |
| 139 | [ds_1338] = { |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 140 | .nvram_offset = 8, |
| 141 | .nvram_size = 56, |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 142 | }, |
| 143 | [ds_1339] = { |
| 144 | .alarm = 1, |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 145 | .trickle_charger_reg = 0x10, |
| 146 | }, |
| 147 | [ds_1340] = { |
| 148 | .trickle_charger_reg = 0x08, |
| 149 | }, |
| 150 | [ds_1388] = { |
| 151 | .trickle_charger_reg = 0x0a, |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 152 | }, |
| 153 | [ds_3231] = { |
| 154 | .alarm = 1, |
| 155 | }, |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 156 | [mcp7941x] = { |
| 157 | /* this is battery backed SRAM */ |
| 158 | .nvram_offset = 0x20, |
| 159 | .nvram_size = 0x40, |
| 160 | }, |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 161 | }; |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 162 | |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 163 | static const struct i2c_device_id ds1307_id[] = { |
| 164 | { "ds1307", ds_1307 }, |
| 165 | { "ds1337", ds_1337 }, |
| 166 | { "ds1338", ds_1338 }, |
| 167 | { "ds1339", ds_1339 }, |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 168 | { "ds1388", ds_1388 }, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 169 | { "ds1340", ds_1340 }, |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 170 | { "ds3231", ds_3231 }, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 171 | { "m41t00", m41t00 }, |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 172 | { "mcp7941x", mcp7941x }, |
Priyanka Jain | 31c1771 | 2011-06-27 16:18:04 -0700 | [diff] [blame] | 173 | { "pt7c4338", ds_1307 }, |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 174 | { "rx8025", rx_8025 }, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 175 | { } |
| 176 | }; |
| 177 | MODULE_DEVICE_TABLE(i2c, ds1307_id); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 178 | |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 179 | /*----------------------------------------------------------------------*/ |
| 180 | |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 181 | #define BLOCK_DATA_MAX_TRIES 10 |
| 182 | |
Jean Delvare | 0cc43a1 | 2011-01-10 22:11:23 +0100 | [diff] [blame] | 183 | static s32 ds1307_read_block_data_once(const struct i2c_client *client, |
| 184 | u8 command, u8 length, u8 *values) |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 185 | { |
| 186 | s32 i, data; |
| 187 | |
| 188 | for (i = 0; i < length; i++) { |
| 189 | data = i2c_smbus_read_byte_data(client, command + i); |
| 190 | if (data < 0) |
| 191 | return data; |
| 192 | values[i] = data; |
| 193 | } |
| 194 | return i; |
| 195 | } |
| 196 | |
Jean Delvare | 0cc43a1 | 2011-01-10 22:11:23 +0100 | [diff] [blame] | 197 | static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command, |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 198 | u8 length, u8 *values) |
| 199 | { |
Bertrand Achard | bc48b90 | 2013-04-29 16:19:26 -0700 | [diff] [blame] | 200 | u8 oldvalues[255]; |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 201 | s32 ret; |
| 202 | int tries = 0; |
| 203 | |
| 204 | dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length); |
| 205 | ret = ds1307_read_block_data_once(client, command, length, values); |
| 206 | if (ret < 0) |
| 207 | return ret; |
| 208 | do { |
| 209 | if (++tries > BLOCK_DATA_MAX_TRIES) { |
| 210 | dev_err(&client->dev, |
| 211 | "ds1307_read_block_data failed\n"); |
| 212 | return -EIO; |
| 213 | } |
| 214 | memcpy(oldvalues, values, length); |
| 215 | ret = ds1307_read_block_data_once(client, command, length, |
| 216 | values); |
| 217 | if (ret < 0) |
| 218 | return ret; |
| 219 | } while (memcmp(oldvalues, values, length)); |
| 220 | return length; |
| 221 | } |
| 222 | |
Jean Delvare | 0cc43a1 | 2011-01-10 22:11:23 +0100 | [diff] [blame] | 223 | static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command, |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 224 | u8 length, const u8 *values) |
| 225 | { |
Bertrand Achard | bc48b90 | 2013-04-29 16:19:26 -0700 | [diff] [blame] | 226 | u8 currvalues[255]; |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 227 | int tries = 0; |
| 228 | |
| 229 | dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length); |
| 230 | do { |
| 231 | s32 i, ret; |
| 232 | |
| 233 | if (++tries > BLOCK_DATA_MAX_TRIES) { |
| 234 | dev_err(&client->dev, |
| 235 | "ds1307_write_block_data failed\n"); |
| 236 | return -EIO; |
| 237 | } |
| 238 | for (i = 0; i < length; i++) { |
| 239 | ret = i2c_smbus_write_byte_data(client, command + i, |
| 240 | values[i]); |
| 241 | if (ret < 0) |
| 242 | return ret; |
| 243 | } |
| 244 | ret = ds1307_read_block_data_once(client, command, length, |
| 245 | currvalues); |
| 246 | if (ret < 0) |
| 247 | return ret; |
| 248 | } while (memcmp(currvalues, values, length)); |
| 249 | return length; |
| 250 | } |
| 251 | |
| 252 | /*----------------------------------------------------------------------*/ |
| 253 | |
Bertrand Achard | bc48b90 | 2013-04-29 16:19:26 -0700 | [diff] [blame] | 254 | /* These RTC devices are not designed to be connected to a SMbus adapter. |
| 255 | SMbus limits block operations length to 32 bytes, whereas it's not |
| 256 | limited on I2C buses. As a result, accesses may exceed 32 bytes; |
| 257 | in that case, split them into smaller blocks */ |
| 258 | |
| 259 | static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client, |
| 260 | u8 command, u8 length, const u8 *values) |
| 261 | { |
| 262 | u8 suboffset = 0; |
| 263 | |
| 264 | if (length <= I2C_SMBUS_BLOCK_MAX) |
| 265 | return i2c_smbus_write_i2c_block_data(client, |
| 266 | command, length, values); |
| 267 | |
| 268 | while (suboffset < length) { |
| 269 | s32 retval = i2c_smbus_write_i2c_block_data(client, |
| 270 | command + suboffset, |
| 271 | min(I2C_SMBUS_BLOCK_MAX, length - suboffset), |
| 272 | values + suboffset); |
| 273 | if (retval < 0) |
| 274 | return retval; |
| 275 | |
| 276 | suboffset += I2C_SMBUS_BLOCK_MAX; |
| 277 | } |
| 278 | return length; |
| 279 | } |
| 280 | |
| 281 | static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client, |
| 282 | u8 command, u8 length, u8 *values) |
| 283 | { |
| 284 | u8 suboffset = 0; |
| 285 | |
| 286 | if (length <= I2C_SMBUS_BLOCK_MAX) |
| 287 | return i2c_smbus_read_i2c_block_data(client, |
| 288 | command, length, values); |
| 289 | |
| 290 | while (suboffset < length) { |
| 291 | s32 retval = i2c_smbus_read_i2c_block_data(client, |
| 292 | command + suboffset, |
| 293 | min(I2C_SMBUS_BLOCK_MAX, length - suboffset), |
| 294 | values + suboffset); |
| 295 | if (retval < 0) |
| 296 | return retval; |
| 297 | |
| 298 | suboffset += I2C_SMBUS_BLOCK_MAX; |
| 299 | } |
| 300 | return length; |
| 301 | } |
| 302 | |
| 303 | /*----------------------------------------------------------------------*/ |
| 304 | |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 305 | /* |
| 306 | * The IRQ logic includes a "real" handler running in IRQ context just |
| 307 | * long enough to schedule this workqueue entry. We need a task context |
| 308 | * to talk to the RTC, since I2C I/O calls require that; and disable the |
| 309 | * IRQ until we clear its status on the chip, so that this handler can |
| 310 | * work with any type of triggering (not just falling edge). |
| 311 | * |
| 312 | * The ds1337 and ds1339 both have two alarms, but we only use the first |
| 313 | * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm |
| 314 | * signal; ds1339 chips have only one alarm signal. |
| 315 | */ |
| 316 | static void ds1307_work(struct work_struct *work) |
| 317 | { |
| 318 | struct ds1307 *ds1307; |
| 319 | struct i2c_client *client; |
| 320 | struct mutex *lock; |
| 321 | int stat, control; |
| 322 | |
| 323 | ds1307 = container_of(work, struct ds1307, work); |
| 324 | client = ds1307->client; |
| 325 | lock = &ds1307->rtc->ops_lock; |
| 326 | |
| 327 | mutex_lock(lock); |
| 328 | stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS); |
| 329 | if (stat < 0) |
| 330 | goto out; |
| 331 | |
| 332 | if (stat & DS1337_BIT_A1I) { |
| 333 | stat &= ~DS1337_BIT_A1I; |
| 334 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat); |
| 335 | |
| 336 | control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); |
| 337 | if (control < 0) |
| 338 | goto out; |
| 339 | |
| 340 | control &= ~DS1337_BIT_A1IE; |
| 341 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control); |
| 342 | |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 343 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | out: |
| 347 | if (test_bit(HAS_ALARM, &ds1307->flags)) |
| 348 | enable_irq(client->irq); |
| 349 | mutex_unlock(lock); |
| 350 | } |
| 351 | |
| 352 | static irqreturn_t ds1307_irq(int irq, void *dev_id) |
| 353 | { |
| 354 | struct i2c_client *client = dev_id; |
| 355 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
| 356 | |
| 357 | disable_irq_nosync(irq); |
| 358 | schedule_work(&ds1307->work); |
| 359 | return IRQ_HANDLED; |
| 360 | } |
| 361 | |
| 362 | /*----------------------------------------------------------------------*/ |
| 363 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 364 | static int ds1307_get_time(struct device *dev, struct rtc_time *t) |
| 365 | { |
| 366 | struct ds1307 *ds1307 = dev_get_drvdata(dev); |
| 367 | int tmp; |
| 368 | |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 369 | /* read the RTC date and time registers all at once */ |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 370 | tmp = ds1307->read_block_data(ds1307->client, |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 371 | ds1307->offset, 7, ds1307->regs); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 372 | if (tmp != 7) { |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 373 | dev_err(dev, "%s error %d\n", "read", tmp); |
| 374 | return -EIO; |
| 375 | } |
| 376 | |
Andy Shevchenko | 01a4ca1 | 2013-02-21 16:44:22 -0800 | [diff] [blame] | 377 | dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 378 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 379 | t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f); |
| 380 | t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 381 | tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 382 | t->tm_hour = bcd2bin(tmp); |
| 383 | t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1; |
| 384 | t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 385 | tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 386 | t->tm_mon = bcd2bin(tmp) - 1; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 387 | |
| 388 | /* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 389 | t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 390 | |
| 391 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 392 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
| 393 | "read", t->tm_sec, t->tm_min, |
| 394 | t->tm_hour, t->tm_mday, |
| 395 | t->tm_mon, t->tm_year, t->tm_wday); |
| 396 | |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 397 | /* initial clock setting can be undefined */ |
| 398 | return rtc_valid_tm(t); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | static int ds1307_set_time(struct device *dev, struct rtc_time *t) |
| 402 | { |
| 403 | struct ds1307 *ds1307 = dev_get_drvdata(dev); |
| 404 | int result; |
| 405 | int tmp; |
| 406 | u8 *buf = ds1307->regs; |
| 407 | |
| 408 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 409 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", |
Jeff Garzik | 11966ad | 2006-10-04 04:41:53 -0400 | [diff] [blame] | 410 | "write", t->tm_sec, t->tm_min, |
| 411 | t->tm_hour, t->tm_mday, |
| 412 | t->tm_mon, t->tm_year, t->tm_wday); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 413 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 414 | buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec); |
| 415 | buf[DS1307_REG_MIN] = bin2bcd(t->tm_min); |
| 416 | buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour); |
| 417 | buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1); |
| 418 | buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday); |
| 419 | buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 420 | |
| 421 | /* assume 20YY not 19YY */ |
| 422 | tmp = t->tm_year - 100; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 423 | buf[DS1307_REG_YEAR] = bin2bcd(tmp); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 424 | |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 425 | switch (ds1307->type) { |
| 426 | case ds_1337: |
| 427 | case ds_1339: |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 428 | case ds_3231: |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 429 | buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY; |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 430 | break; |
| 431 | case ds_1340: |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 432 | buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN |
| 433 | | DS1340_BIT_CENTURY; |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 434 | break; |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 435 | case mcp7941x: |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 436 | /* |
| 437 | * these bits were cleared when preparing the date/time |
| 438 | * values and need to be set again before writing the |
| 439 | * buffer out to the device. |
| 440 | */ |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 441 | buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST; |
| 442 | buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN; |
| 443 | break; |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 444 | default: |
| 445 | break; |
| 446 | } |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 447 | |
Andy Shevchenko | 01a4ca1 | 2013-02-21 16:44:22 -0800 | [diff] [blame] | 448 | dev_dbg(dev, "%s: %7ph\n", "write", buf); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 449 | |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 450 | result = ds1307->write_block_data(ds1307->client, |
| 451 | ds1307->offset, 7, buf); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 452 | if (result < 0) { |
| 453 | dev_err(dev, "%s error %d\n", "write", result); |
| 454 | return result; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 455 | } |
| 456 | return 0; |
| 457 | } |
| 458 | |
Jüri Reitel | 74d88eb | 2009-01-07 18:07:16 -0800 | [diff] [blame] | 459 | static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 460 | { |
| 461 | struct i2c_client *client = to_i2c_client(dev); |
| 462 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
| 463 | int ret; |
| 464 | |
| 465 | if (!test_bit(HAS_ALARM, &ds1307->flags)) |
| 466 | return -EINVAL; |
| 467 | |
| 468 | /* read all ALARM1, ALARM2, and status registers at once */ |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 469 | ret = ds1307->read_block_data(client, |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 470 | DS1339_REG_ALARM1_SECS, 9, ds1307->regs); |
| 471 | if (ret != 9) { |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 472 | dev_err(dev, "%s error %d\n", "alarm read", ret); |
| 473 | return -EIO; |
| 474 | } |
| 475 | |
| 476 | dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n", |
| 477 | "alarm read", |
| 478 | ds1307->regs[0], ds1307->regs[1], |
| 479 | ds1307->regs[2], ds1307->regs[3], |
| 480 | ds1307->regs[4], ds1307->regs[5], |
| 481 | ds1307->regs[6], ds1307->regs[7], |
| 482 | ds1307->regs[8]); |
| 483 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 484 | /* |
| 485 | * report alarm time (ALARM1); assume 24 hour and day-of-month modes, |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 486 | * and that all four fields are checked matches |
| 487 | */ |
| 488 | t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f); |
| 489 | t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f); |
| 490 | t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f); |
| 491 | t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f); |
| 492 | t->time.tm_mon = -1; |
| 493 | t->time.tm_year = -1; |
| 494 | t->time.tm_wday = -1; |
| 495 | t->time.tm_yday = -1; |
| 496 | t->time.tm_isdst = -1; |
| 497 | |
| 498 | /* ... and status */ |
| 499 | t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE); |
| 500 | t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I); |
| 501 | |
| 502 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 503 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", |
| 504 | "alarm read", t->time.tm_sec, t->time.tm_min, |
| 505 | t->time.tm_hour, t->time.tm_mday, |
| 506 | t->enabled, t->pending); |
| 507 | |
| 508 | return 0; |
| 509 | } |
| 510 | |
Jüri Reitel | 74d88eb | 2009-01-07 18:07:16 -0800 | [diff] [blame] | 511 | static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 512 | { |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 513 | struct i2c_client *client = to_i2c_client(dev); |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 514 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
| 515 | unsigned char *buf = ds1307->regs; |
| 516 | u8 control, status; |
| 517 | int ret; |
| 518 | |
| 519 | if (!test_bit(HAS_ALARM, &ds1307->flags)) |
| 520 | return -EINVAL; |
| 521 | |
| 522 | dev_dbg(dev, "%s secs=%d, mins=%d, " |
| 523 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", |
| 524 | "alarm set", t->time.tm_sec, t->time.tm_min, |
| 525 | t->time.tm_hour, t->time.tm_mday, |
| 526 | t->enabled, t->pending); |
| 527 | |
| 528 | /* read current status of both alarms and the chip */ |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 529 | ret = ds1307->read_block_data(client, |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 530 | DS1339_REG_ALARM1_SECS, 9, buf); |
| 531 | if (ret != 9) { |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 532 | dev_err(dev, "%s error %d\n", "alarm write", ret); |
| 533 | return -EIO; |
| 534 | } |
| 535 | control = ds1307->regs[7]; |
| 536 | status = ds1307->regs[8]; |
| 537 | |
| 538 | dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n", |
| 539 | "alarm set (old status)", |
| 540 | ds1307->regs[0], ds1307->regs[1], |
| 541 | ds1307->regs[2], ds1307->regs[3], |
| 542 | ds1307->regs[4], ds1307->regs[5], |
| 543 | ds1307->regs[6], control, status); |
| 544 | |
| 545 | /* set ALARM1, using 24 hour and day-of-month modes */ |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 546 | buf[0] = bin2bcd(t->time.tm_sec); |
| 547 | buf[1] = bin2bcd(t->time.tm_min); |
| 548 | buf[2] = bin2bcd(t->time.tm_hour); |
| 549 | buf[3] = bin2bcd(t->time.tm_mday); |
| 550 | |
| 551 | /* set ALARM2 to non-garbage */ |
| 552 | buf[4] = 0; |
| 553 | buf[5] = 0; |
| 554 | buf[6] = 0; |
| 555 | |
| 556 | /* optionally enable ALARM1 */ |
| 557 | buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE); |
| 558 | if (t->enabled) { |
| 559 | dev_dbg(dev, "alarm IRQ armed\n"); |
| 560 | buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */ |
| 561 | } |
| 562 | buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I); |
| 563 | |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 564 | ret = ds1307->write_block_data(client, |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 565 | DS1339_REG_ALARM1_SECS, 9, buf); |
| 566 | if (ret < 0) { |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 567 | dev_err(dev, "can't set alarm time\n"); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 568 | return ret; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | return 0; |
| 572 | } |
| 573 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 574 | static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled) |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 575 | { |
| 576 | struct i2c_client *client = to_i2c_client(dev); |
| 577 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
| 578 | int ret; |
| 579 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 580 | if (!test_bit(HAS_ALARM, &ds1307->flags)) |
| 581 | return -ENOTTY; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 582 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 583 | ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); |
| 584 | if (ret < 0) |
| 585 | return ret; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 586 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 587 | if (enabled) |
| 588 | ret |= DS1337_BIT_A1IE; |
| 589 | else |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 590 | ret &= ~DS1337_BIT_A1IE; |
| 591 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 592 | ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret); |
| 593 | if (ret < 0) |
| 594 | return ret; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 595 | |
| 596 | return 0; |
| 597 | } |
| 598 | |
David Brownell | ff8371a | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 599 | static const struct rtc_class_ops ds13xx_rtc_ops = { |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 600 | .read_time = ds1307_get_time, |
| 601 | .set_time = ds1307_set_time, |
Jüri Reitel | 74d88eb | 2009-01-07 18:07:16 -0800 | [diff] [blame] | 602 | .read_alarm = ds1337_read_alarm, |
| 603 | .set_alarm = ds1337_set_alarm, |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 604 | .alarm_irq_enable = ds1307_alarm_irq_enable, |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 605 | }; |
| 606 | |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 607 | /*----------------------------------------------------------------------*/ |
| 608 | |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 609 | static ssize_t |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 610 | ds1307_nvram_read(struct file *filp, struct kobject *kobj, |
| 611 | struct bin_attribute *attr, |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 612 | char *buf, loff_t off, size_t count) |
| 613 | { |
| 614 | struct i2c_client *client; |
| 615 | struct ds1307 *ds1307; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 616 | int result; |
| 617 | |
frederic Rodo | fcd8db0 | 2008-02-06 01:38:55 -0800 | [diff] [blame] | 618 | client = kobj_to_i2c_client(kobj); |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 619 | ds1307 = i2c_get_clientdata(client); |
| 620 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 621 | if (unlikely(off >= ds1307->nvram->size)) |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 622 | return 0; |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 623 | if ((off + count) > ds1307->nvram->size) |
| 624 | count = ds1307->nvram->size - off; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 625 | if (unlikely(!count)) |
| 626 | return count; |
| 627 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 628 | result = ds1307->read_block_data(client, ds1307->nvram_offset + off, |
| 629 | count, buf); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 630 | if (result < 0) |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 631 | dev_err(&client->dev, "%s error %d\n", "nvram read", result); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 632 | return result; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | static ssize_t |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 636 | ds1307_nvram_write(struct file *filp, struct kobject *kobj, |
| 637 | struct bin_attribute *attr, |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 638 | char *buf, loff_t off, size_t count) |
| 639 | { |
| 640 | struct i2c_client *client; |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 641 | struct ds1307 *ds1307; |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 642 | int result; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 643 | |
frederic Rodo | fcd8db0 | 2008-02-06 01:38:55 -0800 | [diff] [blame] | 644 | client = kobj_to_i2c_client(kobj); |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 645 | ds1307 = i2c_get_clientdata(client); |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 646 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 647 | if (unlikely(off >= ds1307->nvram->size)) |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 648 | return -EFBIG; |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 649 | if ((off + count) > ds1307->nvram->size) |
| 650 | count = ds1307->nvram->size - off; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 651 | if (unlikely(!count)) |
| 652 | return count; |
| 653 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 654 | result = ds1307->write_block_data(client, ds1307->nvram_offset + off, |
| 655 | count, buf); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 656 | if (result < 0) { |
| 657 | dev_err(&client->dev, "%s error %d\n", "nvram write", result); |
| 658 | return result; |
| 659 | } |
| 660 | return count; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 661 | } |
| 662 | |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 663 | /*----------------------------------------------------------------------*/ |
| 664 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 665 | static int ds1307_probe(struct i2c_client *client, |
| 666 | const struct i2c_device_id *id) |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 667 | { |
| 668 | struct ds1307 *ds1307; |
| 669 | int err = -ENODEV; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 670 | int tmp; |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 671 | const struct chip_desc *chip = &chips[id->driver_data]; |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 672 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 673 | int want_irq = false; |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 674 | unsigned char *buf; |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 675 | struct ds1307_platform_data *pdata = client->dev.platform_data; |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 676 | static const int bbsqi_bitpos[] = { |
| 677 | [ds_1337] = 0, |
| 678 | [ds_1339] = DS1339_BIT_BBSQI, |
| 679 | [ds_3231] = DS3231_BIT_BBSQW, |
| 680 | }; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 681 | |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 682 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA) |
| 683 | && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 684 | return -EIO; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 685 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 686 | ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL); |
| 687 | if (!ds1307) |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 688 | return -ENOMEM; |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 689 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 690 | i2c_set_clientdata(client, ds1307); |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 691 | |
| 692 | ds1307->client = client; |
| 693 | ds1307->type = id->driver_data; |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 694 | |
Wolfram Sang | eb86c30 | 2012-05-29 15:07:38 -0700 | [diff] [blame] | 695 | if (pdata && pdata->trickle_charger_setup && chip->trickle_charger_reg) |
| 696 | i2c_smbus_write_byte_data(client, chip->trickle_charger_reg, |
| 697 | DS13XX_TRICKLE_CHARGER_MAGIC | pdata->trickle_charger_setup); |
| 698 | |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 699 | buf = ds1307->regs; |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 700 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { |
Bertrand Achard | bc48b90 | 2013-04-29 16:19:26 -0700 | [diff] [blame] | 701 | ds1307->read_block_data = ds1307_native_smbus_read_block_data; |
| 702 | ds1307->write_block_data = ds1307_native_smbus_write_block_data; |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 703 | } else { |
| 704 | ds1307->read_block_data = ds1307_read_block_data; |
| 705 | ds1307->write_block_data = ds1307_write_block_data; |
| 706 | } |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 707 | |
| 708 | switch (ds1307->type) { |
| 709 | case ds_1337: |
| 710 | case ds_1339: |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 711 | case ds_3231: |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 712 | /* get registers that the "rtc" read below won't read... */ |
Ed Swierk | 30e7b03 | 2009-03-31 15:24:56 -0700 | [diff] [blame] | 713 | tmp = ds1307->read_block_data(ds1307->client, |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 714 | DS1337_REG_CONTROL, 2, buf); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 715 | if (tmp != 2) { |
Jingoo Han | 6df80e2 | 2013-04-29 16:19:28 -0700 | [diff] [blame] | 716 | dev_dbg(&client->dev, "read error %d\n", tmp); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 717 | err = -EIO; |
| 718 | goto exit_free; |
| 719 | } |
| 720 | |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 721 | /* oscillator off? turn it on, so clock can tick. */ |
| 722 | if (ds1307->regs[0] & DS1337_BIT_nEOSC) |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 723 | ds1307->regs[0] &= ~DS1337_BIT_nEOSC; |
| 724 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 725 | /* |
| 726 | * Using IRQ? Disable the square wave and both alarms. |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 727 | * For some variants, be sure alarms can trigger when we're |
| 728 | * running on Vbackup (BBSQI/BBSQW) |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 729 | */ |
Wolfram Sang | b24a726 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 730 | if (ds1307->client->irq > 0 && chip->alarm) { |
| 731 | INIT_WORK(&ds1307->work, ds1307_work); |
| 732 | |
Wolfram Sang | 97f902b | 2009-06-17 16:26:10 -0700 | [diff] [blame] | 733 | ds1307->regs[0] |= DS1337_BIT_INTCN |
| 734 | | bbsqi_bitpos[ds1307->type]; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 735 | ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); |
Wolfram Sang | b24a726 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 736 | |
| 737 | want_irq = true; |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, |
| 741 | ds1307->regs[0]); |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 742 | |
| 743 | /* oscillator fault? clear flag, and warn */ |
| 744 | if (ds1307->regs[1] & DS1337_BIT_OSF) { |
| 745 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, |
| 746 | ds1307->regs[1] & ~DS1337_BIT_OSF); |
| 747 | dev_warn(&client->dev, "SET TIME!\n"); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 748 | } |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 749 | break; |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 750 | |
| 751 | case rx_8025: |
| 752 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, |
| 753 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); |
| 754 | if (tmp != 2) { |
Jingoo Han | 6df80e2 | 2013-04-29 16:19:28 -0700 | [diff] [blame] | 755 | dev_dbg(&client->dev, "read error %d\n", tmp); |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 756 | err = -EIO; |
| 757 | goto exit_free; |
| 758 | } |
| 759 | |
| 760 | /* oscillator off? turn it on, so clock can tick. */ |
| 761 | if (!(ds1307->regs[1] & RX8025_BIT_XST)) { |
| 762 | ds1307->regs[1] |= RX8025_BIT_XST; |
| 763 | i2c_smbus_write_byte_data(client, |
| 764 | RX8025_REG_CTRL2 << 4 | 0x08, |
| 765 | ds1307->regs[1]); |
| 766 | dev_warn(&client->dev, |
| 767 | "oscillator stop detected - SET TIME!\n"); |
| 768 | } |
| 769 | |
| 770 | if (ds1307->regs[1] & RX8025_BIT_PON) { |
| 771 | ds1307->regs[1] &= ~RX8025_BIT_PON; |
| 772 | i2c_smbus_write_byte_data(client, |
| 773 | RX8025_REG_CTRL2 << 4 | 0x08, |
| 774 | ds1307->regs[1]); |
| 775 | dev_warn(&client->dev, "power-on detected\n"); |
| 776 | } |
| 777 | |
| 778 | if (ds1307->regs[1] & RX8025_BIT_VDET) { |
| 779 | ds1307->regs[1] &= ~RX8025_BIT_VDET; |
| 780 | i2c_smbus_write_byte_data(client, |
| 781 | RX8025_REG_CTRL2 << 4 | 0x08, |
| 782 | ds1307->regs[1]); |
| 783 | dev_warn(&client->dev, "voltage drop detected\n"); |
| 784 | } |
| 785 | |
| 786 | /* make sure we are running in 24hour mode */ |
| 787 | if (!(ds1307->regs[0] & RX8025_BIT_2412)) { |
| 788 | u8 hour; |
| 789 | |
| 790 | /* switch to 24 hour mode */ |
| 791 | i2c_smbus_write_byte_data(client, |
| 792 | RX8025_REG_CTRL1 << 4 | 0x08, |
| 793 | ds1307->regs[0] | |
| 794 | RX8025_BIT_2412); |
| 795 | |
| 796 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, |
| 797 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); |
| 798 | if (tmp != 2) { |
Jingoo Han | 6df80e2 | 2013-04-29 16:19:28 -0700 | [diff] [blame] | 799 | dev_dbg(&client->dev, "read error %d\n", tmp); |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 800 | err = -EIO; |
| 801 | goto exit_free; |
| 802 | } |
| 803 | |
| 804 | /* correct hour */ |
| 805 | hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]); |
| 806 | if (hour == 12) |
| 807 | hour = 0; |
| 808 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) |
| 809 | hour += 12; |
| 810 | |
| 811 | i2c_smbus_write_byte_data(client, |
| 812 | DS1307_REG_HOUR << 4 | 0x08, |
| 813 | hour); |
| 814 | } |
| 815 | break; |
Joakim Tjernlund | 33df2ee | 2009-06-17 16:26:08 -0700 | [diff] [blame] | 816 | case ds_1388: |
| 817 | ds1307->offset = 1; /* Seconds starts at 1 */ |
| 818 | break; |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 819 | default: |
| 820 | break; |
| 821 | } |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 822 | |
| 823 | read_rtc: |
| 824 | /* read RTC registers */ |
Joakim Tjernlund | 96fc3a4 | 2010-06-29 15:05:34 -0700 | [diff] [blame] | 825 | tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf); |
BARRE Sebastien | fed40b7 | 2009-01-07 18:07:13 -0800 | [diff] [blame] | 826 | if (tmp != 8) { |
Jingoo Han | 6df80e2 | 2013-04-29 16:19:28 -0700 | [diff] [blame] | 827 | dev_dbg(&client->dev, "read error %d\n", tmp); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 828 | err = -EIO; |
| 829 | goto exit_free; |
| 830 | } |
| 831 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 832 | /* |
| 833 | * minimal sanity checking; some chips (like DS1340) don't |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 834 | * specify the extra bits as must-be-zero, but there are |
| 835 | * still a few values that are clearly out-of-range. |
| 836 | */ |
| 837 | tmp = ds1307->regs[DS1307_REG_SECS]; |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 838 | switch (ds1307->type) { |
| 839 | case ds_1307: |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 840 | case m41t00: |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 841 | /* clock halted? turn it on, so clock can tick. */ |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 842 | if (tmp & DS1307_BIT_CH) { |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 843 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
| 844 | dev_warn(&client->dev, "SET TIME!\n"); |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 845 | goto read_rtc; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 846 | } |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 847 | break; |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 848 | case ds_1338: |
| 849 | /* clock halted? turn it on, so clock can tick. */ |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 850 | if (tmp & DS1307_BIT_CH) |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 851 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
| 852 | |
| 853 | /* oscillator fault? clear flag, and warn */ |
| 854 | if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) { |
| 855 | i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL, |
David Brownell | bd16f9e | 2007-07-26 10:41:00 -0700 | [diff] [blame] | 856 | ds1307->regs[DS1307_REG_CONTROL] |
Rodolfo Giometti | be5f59f | 2007-07-17 04:05:06 -0700 | [diff] [blame] | 857 | & ~DS1338_BIT_OSF); |
| 858 | dev_warn(&client->dev, "SET TIME!\n"); |
| 859 | goto read_rtc; |
| 860 | } |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 861 | break; |
frederic Rodo | fcd8db0 | 2008-02-06 01:38:55 -0800 | [diff] [blame] | 862 | case ds_1340: |
| 863 | /* clock halted? turn it on, so clock can tick. */ |
| 864 | if (tmp & DS1340_BIT_nEOSC) |
| 865 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
| 866 | |
| 867 | tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG); |
| 868 | if (tmp < 0) { |
Jingoo Han | 6df80e2 | 2013-04-29 16:19:28 -0700 | [diff] [blame] | 869 | dev_dbg(&client->dev, "read error %d\n", tmp); |
frederic Rodo | fcd8db0 | 2008-02-06 01:38:55 -0800 | [diff] [blame] | 870 | err = -EIO; |
| 871 | goto exit_free; |
| 872 | } |
| 873 | |
| 874 | /* oscillator fault? clear flag, and warn */ |
| 875 | if (tmp & DS1340_BIT_OSF) { |
| 876 | i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0); |
| 877 | dev_warn(&client->dev, "SET TIME!\n"); |
| 878 | } |
| 879 | break; |
David Anders | 43fcb81 | 2011-11-02 13:37:53 -0700 | [diff] [blame] | 880 | case mcp7941x: |
| 881 | /* make sure that the backup battery is enabled */ |
| 882 | if (!(ds1307->regs[DS1307_REG_WDAY] & MCP7941X_BIT_VBATEN)) { |
| 883 | i2c_smbus_write_byte_data(client, DS1307_REG_WDAY, |
| 884 | ds1307->regs[DS1307_REG_WDAY] |
| 885 | | MCP7941X_BIT_VBATEN); |
| 886 | } |
| 887 | |
| 888 | /* clock halted? turn it on, so clock can tick. */ |
| 889 | if (!(tmp & MCP7941X_BIT_ST)) { |
| 890 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, |
| 891 | MCP7941X_BIT_ST); |
| 892 | dev_warn(&client->dev, "SET TIME!\n"); |
| 893 | goto read_rtc; |
| 894 | } |
| 895 | |
| 896 | break; |
Wolfram Sang | 32d322b | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 897 | default: |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 898 | break; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 899 | } |
David Brownell | 045e0e8 | 2007-07-17 04:04:55 -0700 | [diff] [blame] | 900 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 901 | tmp = ds1307->regs[DS1307_REG_HOUR]; |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 902 | switch (ds1307->type) { |
| 903 | case ds_1340: |
| 904 | case m41t00: |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 905 | /* |
| 906 | * NOTE: ignores century bits; fix before deploying |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 907 | * systems that will run through year 2100. |
| 908 | */ |
| 909 | break; |
Matthias Fuchs | a216685 | 2009-03-31 15:24:58 -0700 | [diff] [blame] | 910 | case rx_8025: |
| 911 | break; |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 912 | default: |
| 913 | if (!(tmp & DS1307_BIT_12HR)) |
| 914 | break; |
| 915 | |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 916 | /* |
| 917 | * Be sure we're in 24 hour mode. Multi-master systems |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 918 | * take note... |
| 919 | */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 920 | tmp = bcd2bin(tmp & 0x1f); |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 921 | if (tmp == 12) |
| 922 | tmp = 0; |
| 923 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) |
| 924 | tmp += 12; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 925 | i2c_smbus_write_byte_data(client, |
Joakim Tjernlund | 96fc3a4 | 2010-06-29 15:05:34 -0700 | [diff] [blame] | 926 | ds1307->offset + DS1307_REG_HOUR, |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 927 | bin2bcd(tmp)); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 928 | } |
| 929 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 930 | ds1307->rtc = rtc_device_register(client->name, &client->dev, |
| 931 | &ds13xx_rtc_ops, THIS_MODULE); |
| 932 | if (IS_ERR(ds1307->rtc)) { |
| 933 | err = PTR_ERR(ds1307->rtc); |
| 934 | dev_err(&client->dev, |
| 935 | "unable to register the class device\n"); |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 936 | goto exit_free; |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 939 | if (want_irq) { |
Dmitry Eremin-Solenikov | 43d15bc | 2009-12-15 16:46:14 -0800 | [diff] [blame] | 940 | err = request_irq(client->irq, ds1307_irq, IRQF_SHARED, |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 941 | ds1307->rtc->name, client); |
| 942 | if (err) { |
| 943 | dev_err(&client->dev, |
| 944 | "unable to request IRQ!\n"); |
| 945 | goto exit_irq; |
| 946 | } |
Anton Vorontsov | 26b3c01 | 2009-12-17 15:27:23 -0800 | [diff] [blame] | 947 | |
| 948 | device_set_wakeup_capable(&client->dev, 1); |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 949 | set_bit(HAS_ALARM, &ds1307->flags); |
| 950 | dev_dbg(&client->dev, "got IRQ %d\n", client->irq); |
| 951 | } |
| 952 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 953 | if (chip->nvram_size) { |
| 954 | ds1307->nvram = kzalloc(sizeof(struct bin_attribute), |
| 955 | GFP_KERNEL); |
| 956 | if (!ds1307->nvram) { |
| 957 | err = -ENOMEM; |
| 958 | goto exit_nvram; |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 959 | } |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 960 | ds1307->nvram->attr.name = "nvram"; |
| 961 | ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR; |
Anatolij Gustschin | 3f5ec5e | 2012-04-25 16:01:51 -0700 | [diff] [blame] | 962 | sysfs_bin_attr_init(ds1307->nvram); |
Steffen Trumtrar | b9c3570 | 2013-04-29 16:20:16 -0700 | [diff] [blame^] | 963 | ds1307->nvram->read = ds1307_nvram_read; |
| 964 | ds1307->nvram->write = ds1307_nvram_write; |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 965 | ds1307->nvram->size = chip->nvram_size; |
| 966 | ds1307->nvram_offset = chip->nvram_offset; |
| 967 | err = sysfs_create_bin_file(&client->dev.kobj, ds1307->nvram); |
| 968 | if (err) { |
| 969 | kfree(ds1307->nvram); |
| 970 | goto exit_nvram; |
| 971 | } |
| 972 | set_bit(HAS_NVRAM, &ds1307->flags); |
| 973 | dev_info(&client->dev, "%zu bytes nvram\n", ds1307->nvram->size); |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 974 | } |
| 975 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 976 | return 0; |
| 977 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 978 | exit_nvram: |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 979 | exit_irq: |
Julia Lawall | 72445af | 2009-09-22 16:46:29 -0700 | [diff] [blame] | 980 | rtc_device_unregister(ds1307->rtc); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 981 | exit_free: |
| 982 | kfree(ds1307); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 983 | return err; |
| 984 | } |
| 985 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 986 | static int ds1307_remove(struct i2c_client *client) |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 987 | { |
David Anders | 40ce972 | 2012-03-23 15:02:37 -0700 | [diff] [blame] | 988 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 989 | |
Rodolfo Giometti | cb49a5e | 2008-10-15 22:02:58 -0700 | [diff] [blame] | 990 | if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) { |
| 991 | free_irq(client->irq, client); |
| 992 | cancel_work_sync(&ds1307->work); |
| 993 | } |
| 994 | |
Austin Boyle | 9eab0a7 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 995 | if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) { |
| 996 | sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram); |
| 997 | kfree(ds1307->nvram); |
| 998 | } |
David Brownell | 682d73f | 2007-11-14 16:58:32 -0800 | [diff] [blame] | 999 | |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1000 | rtc_device_unregister(ds1307->rtc); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1001 | kfree(ds1307); |
| 1002 | return 0; |
| 1003 | } |
| 1004 | |
| 1005 | static struct i2c_driver ds1307_driver = { |
| 1006 | .driver = { |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 1007 | .name = "rtc-ds1307", |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1008 | .owner = THIS_MODULE, |
| 1009 | }, |
David Brownell | c065f35 | 2007-07-17 04:05:10 -0700 | [diff] [blame] | 1010 | .probe = ds1307_probe, |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 1011 | .remove = ds1307_remove, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 1012 | .id_table = ds1307_id, |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1013 | }; |
| 1014 | |
Axel Lin | 0abc920 | 2012-03-23 15:02:31 -0700 | [diff] [blame] | 1015 | module_i2c_driver(ds1307_driver); |
David Brownell | 1abb0dc | 2006-06-25 05:48:17 -0700 | [diff] [blame] | 1016 | |
| 1017 | MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips"); |
| 1018 | MODULE_LICENSE("GPL"); |