Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 1 | /* |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 2 | * Micro Crystal RV-3029 rtc class driver |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 3 | * |
| 4 | * Author: Gregory Hermant <gregory.hermant@calao-systems.com> |
| 5 | * |
| 6 | * based on previously existing rtc class drivers |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * NOTE: Currently this driver only supports the bare minimum for read |
| 13 | * and write the RTC and alarms. The extra features provided by this chip |
| 14 | * (trickle charger, eeprom, T° compensation) are unavailable. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/i2c.h> |
| 19 | #include <linux/bcd.h> |
| 20 | #include <linux/rtc.h> |
| 21 | |
| 22 | /* Register map */ |
| 23 | /* control section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 24 | #define RV3029_ONOFF_CTRL 0x00 |
| 25 | #define RV3029_IRQ_CTRL 0x01 |
| 26 | #define RV3029_IRQ_CTRL_AIE (1 << 0) |
| 27 | #define RV3029_IRQ_FLAGS 0x02 |
| 28 | #define RV3029_IRQ_FLAGS_AF (1 << 0) |
| 29 | #define RV3029_STATUS 0x03 |
| 30 | #define RV3029_STATUS_VLOW1 (1 << 2) |
| 31 | #define RV3029_STATUS_VLOW2 (1 << 3) |
| 32 | #define RV3029_STATUS_SR (1 << 4) |
| 33 | #define RV3029_STATUS_PON (1 << 5) |
| 34 | #define RV3029_STATUS_EEBUSY (1 << 7) |
| 35 | #define RV3029_RST_CTRL 0x04 |
| 36 | #define RV3029_CONTROL_SECTION_LEN 0x05 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 37 | |
| 38 | /* watch section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 39 | #define RV3029_W_SEC 0x08 |
| 40 | #define RV3029_W_MINUTES 0x09 |
| 41 | #define RV3029_W_HOURS 0x0A |
| 42 | #define RV3029_REG_HR_12_24 (1<<6) /* 24h/12h mode */ |
| 43 | #define RV3029_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ |
| 44 | #define RV3029_W_DATE 0x0B |
| 45 | #define RV3029_W_DAYS 0x0C |
| 46 | #define RV3029_W_MONTHS 0x0D |
| 47 | #define RV3029_W_YEARS 0x0E |
| 48 | #define RV3029_WATCH_SECTION_LEN 0x07 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 49 | |
| 50 | /* alarm section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 51 | #define RV3029_A_SC 0x10 |
| 52 | #define RV3029_A_MN 0x11 |
| 53 | #define RV3029_A_HR 0x12 |
| 54 | #define RV3029_A_DT 0x13 |
| 55 | #define RV3029_A_DW 0x14 |
| 56 | #define RV3029_A_MO 0x15 |
| 57 | #define RV3029_A_YR 0x16 |
| 58 | #define RV3029_ALARM_SECTION_LEN 0x07 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 59 | |
| 60 | /* timer section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 61 | #define RV3029_TIMER_LOW 0x18 |
| 62 | #define RV3029_TIMER_HIGH 0x19 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 63 | |
| 64 | /* temperature section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 65 | #define RV3029_TEMP_PAGE 0x20 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 66 | |
| 67 | /* eeprom data section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 68 | #define RV3029_E2P_EEDATA1 0x28 |
| 69 | #define RV3029_E2P_EEDATA2 0x29 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 70 | |
| 71 | /* eeprom control section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 72 | #define RV3029_CONTROL_E2P_EECTRL 0x30 |
| 73 | #define RV3029_TRICKLE_1K (1<<0) /* 1K resistance */ |
| 74 | #define RV3029_TRICKLE_5K (1<<1) /* 5K resistance */ |
| 75 | #define RV3029_TRICKLE_20K (1<<2) /* 20K resistance */ |
| 76 | #define RV3029_TRICKLE_80K (1<<3) /* 80K resistance */ |
| 77 | #define RV3029_CONTROL_E2P_XTALOFFSET 0x31 |
| 78 | #define RV3029_CONTROL_E2P_QCOEF 0x32 |
| 79 | #define RV3029_CONTROL_E2P_TURNOVER 0x33 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 80 | |
| 81 | /* user ram section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 82 | #define RV3029_USR1_RAM_PAGE 0x38 |
| 83 | #define RV3029_USR1_SECTION_LEN 0x04 |
| 84 | #define RV3029_USR2_RAM_PAGE 0x3C |
| 85 | #define RV3029_USR2_SECTION_LEN 0x04 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 86 | |
| 87 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 88 | rv3029_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf, |
| 89 | unsigned len) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 90 | { |
| 91 | int ret; |
| 92 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 93 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
| 94 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 95 | return -EINVAL; |
| 96 | |
| 97 | ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); |
| 98 | if (ret < 0) |
| 99 | return ret; |
| 100 | if (ret < len) |
| 101 | return -EIO; |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 106 | rv3029_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[], |
| 107 | unsigned len) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 108 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 109 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
| 110 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 111 | return -EINVAL; |
| 112 | |
| 113 | return i2c_smbus_write_i2c_block_data(client, reg, len, buf); |
| 114 | } |
| 115 | |
| 116 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 117 | rv3029_i2c_get_sr(struct i2c_client *client, u8 *buf) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 118 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 119 | int ret = rv3029_i2c_read_regs(client, RV3029_STATUS, buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 120 | |
| 121 | if (ret < 0) |
| 122 | return -EIO; |
| 123 | dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 128 | rv3029_i2c_set_sr(struct i2c_client *client, u8 val) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 129 | { |
| 130 | u8 buf[1]; |
| 131 | int sr; |
| 132 | |
| 133 | buf[0] = val; |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 134 | sr = rv3029_i2c_write_regs(client, RV3029_STATUS, buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 135 | dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); |
| 136 | if (sr < 0) |
| 137 | return -EIO; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 142 | rv3029_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 143 | { |
| 144 | u8 buf[1]; |
| 145 | int ret; |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 146 | u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 147 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 148 | ret = rv3029_i2c_get_sr(client, buf); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 149 | if (ret < 0) { |
| 150 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| 151 | return -EIO; |
| 152 | } |
| 153 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 154 | ret = rv3029_i2c_read_regs(client, RV3029_W_SEC, regs, |
| 155 | RV3029_WATCH_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 156 | if (ret < 0) { |
| 157 | dev_err(&client->dev, "%s: reading RTC section failed\n", |
| 158 | __func__); |
| 159 | return ret; |
| 160 | } |
| 161 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 162 | tm->tm_sec = bcd2bin(regs[RV3029_W_SEC-RV3029_W_SEC]); |
| 163 | tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES-RV3029_W_SEC]); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 164 | |
| 165 | /* HR field has a more complex interpretation */ |
| 166 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 167 | const u8 _hr = regs[RV3029_W_HOURS-RV3029_W_SEC]; |
| 168 | |
| 169 | if (_hr & RV3029_REG_HR_12_24) { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 170 | /* 12h format */ |
| 171 | tm->tm_hour = bcd2bin(_hr & 0x1f); |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 172 | if (_hr & RV3029_REG_HR_PM) /* PM flag set */ |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 173 | tm->tm_hour += 12; |
| 174 | } else /* 24h format */ |
| 175 | tm->tm_hour = bcd2bin(_hr & 0x3f); |
| 176 | } |
| 177 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 178 | tm->tm_mday = bcd2bin(regs[RV3029_W_DATE-RV3029_W_SEC]); |
| 179 | tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS-RV3029_W_SEC]) - 1; |
| 180 | tm->tm_year = bcd2bin(regs[RV3029_W_YEARS-RV3029_W_SEC]) + 100; |
| 181 | tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS-RV3029_W_SEC]) - 1; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 186 | static int rv3029_rtc_read_time(struct device *dev, struct rtc_time *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 187 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 188 | return rv3029_i2c_read_time(to_i2c_client(dev), tm); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 192 | rv3029_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 193 | { |
| 194 | struct rtc_time *const tm = &alarm->time; |
| 195 | int ret; |
| 196 | u8 regs[8]; |
| 197 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 198 | ret = rv3029_i2c_get_sr(client, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 199 | if (ret < 0) { |
| 200 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| 201 | return -EIO; |
| 202 | } |
| 203 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 204 | ret = rv3029_i2c_read_regs(client, RV3029_A_SC, regs, |
| 205 | RV3029_ALARM_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 206 | |
| 207 | if (ret < 0) { |
| 208 | dev_err(&client->dev, "%s: reading alarm section failed\n", |
| 209 | __func__); |
| 210 | return ret; |
| 211 | } |
| 212 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 213 | tm->tm_sec = bcd2bin(regs[RV3029_A_SC-RV3029_A_SC] & 0x7f); |
| 214 | tm->tm_min = bcd2bin(regs[RV3029_A_MN-RV3029_A_SC] & 0x7f); |
| 215 | tm->tm_hour = bcd2bin(regs[RV3029_A_HR-RV3029_A_SC] & 0x3f); |
| 216 | tm->tm_mday = bcd2bin(regs[RV3029_A_DT-RV3029_A_SC] & 0x3f); |
| 217 | tm->tm_mon = bcd2bin(regs[RV3029_A_MO-RV3029_A_SC] & 0x1f) - 1; |
| 218 | tm->tm_year = bcd2bin(regs[RV3029_A_YR-RV3029_A_SC] & 0x7f) + 100; |
| 219 | tm->tm_wday = bcd2bin(regs[RV3029_A_DW-RV3029_A_SC] & 0x07) - 1; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 225 | rv3029_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 226 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 227 | return rv3029_i2c_read_alarm(to_i2c_client(dev), alarm); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 228 | } |
| 229 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 230 | static int rv3029_rtc_i2c_alarm_set_irq(struct i2c_client *client, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 231 | int enable) |
| 232 | { |
| 233 | int ret; |
| 234 | u8 buf[1]; |
| 235 | |
| 236 | /* enable AIE irq */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 237 | ret = rv3029_i2c_read_regs(client, RV3029_IRQ_CTRL, buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 238 | if (ret < 0) { |
| 239 | dev_err(&client->dev, "can't read INT reg\n"); |
| 240 | return ret; |
| 241 | } |
| 242 | if (enable) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 243 | buf[0] |= RV3029_IRQ_CTRL_AIE; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 244 | else |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 245 | buf[0] &= ~RV3029_IRQ_CTRL_AIE; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 246 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 247 | ret = rv3029_i2c_write_regs(client, RV3029_IRQ_CTRL, buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 248 | if (ret < 0) { |
| 249 | dev_err(&client->dev, "can't set INT reg\n"); |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 256 | static int rv3029_rtc_i2c_set_alarm(struct i2c_client *client, |
| 257 | struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 258 | { |
| 259 | struct rtc_time *const tm = &alarm->time; |
| 260 | int ret; |
| 261 | u8 regs[8]; |
| 262 | |
| 263 | /* |
| 264 | * The clock has an 8 bit wide bcd-coded register (they never learn) |
| 265 | * for the year. tm_year is an offset from 1900 and we are interested |
| 266 | * in the 2000-2099 range, so any value less than 100 is invalid. |
| 267 | */ |
| 268 | if (tm->tm_year < 100) |
| 269 | return -EINVAL; |
| 270 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 271 | ret = rv3029_i2c_get_sr(client, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 272 | if (ret < 0) { |
| 273 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| 274 | return -EIO; |
| 275 | } |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 276 | regs[RV3029_A_SC-RV3029_A_SC] = bin2bcd(tm->tm_sec & 0x7f); |
| 277 | regs[RV3029_A_MN-RV3029_A_SC] = bin2bcd(tm->tm_min & 0x7f); |
| 278 | regs[RV3029_A_HR-RV3029_A_SC] = bin2bcd(tm->tm_hour & 0x3f); |
| 279 | regs[RV3029_A_DT-RV3029_A_SC] = bin2bcd(tm->tm_mday & 0x3f); |
| 280 | regs[RV3029_A_MO-RV3029_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1); |
| 281 | regs[RV3029_A_DW-RV3029_A_SC] = bin2bcd((tm->tm_wday & 7) - 1); |
| 282 | regs[RV3029_A_YR-RV3029_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 283 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 284 | ret = rv3029_i2c_write_regs(client, RV3029_A_SC, regs, |
| 285 | RV3029_ALARM_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 286 | if (ret < 0) |
| 287 | return ret; |
| 288 | |
| 289 | if (alarm->enabled) { |
| 290 | u8 buf[1]; |
| 291 | |
| 292 | /* clear AF flag */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 293 | ret = rv3029_i2c_read_regs(client, RV3029_IRQ_FLAGS, |
| 294 | buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 295 | if (ret < 0) { |
| 296 | dev_err(&client->dev, "can't read alarm flag\n"); |
| 297 | return ret; |
| 298 | } |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 299 | buf[0] &= ~RV3029_IRQ_FLAGS_AF; |
| 300 | ret = rv3029_i2c_write_regs(client, RV3029_IRQ_FLAGS, |
| 301 | buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 302 | if (ret < 0) { |
| 303 | dev_err(&client->dev, "can't set alarm flag\n"); |
| 304 | return ret; |
| 305 | } |
| 306 | /* enable AIE irq */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 307 | ret = rv3029_rtc_i2c_alarm_set_irq(client, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 308 | if (ret) |
| 309 | return ret; |
| 310 | |
| 311 | dev_dbg(&client->dev, "alarm IRQ armed\n"); |
| 312 | } else { |
| 313 | /* disable AIE irq */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 314 | ret = rv3029_rtc_i2c_alarm_set_irq(client, 0); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 315 | if (ret) |
| 316 | return ret; |
| 317 | |
| 318 | dev_dbg(&client->dev, "alarm IRQ disabled\n"); |
| 319 | } |
| 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 324 | static int rv3029_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 325 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 326 | return rv3029_rtc_i2c_set_alarm(to_i2c_client(dev), alarm); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | static int |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 330 | rv3029_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 331 | { |
| 332 | u8 regs[8]; |
| 333 | int ret; |
| 334 | |
| 335 | /* |
| 336 | * The clock has an 8 bit wide bcd-coded register (they never learn) |
| 337 | * for the year. tm_year is an offset from 1900 and we are interested |
| 338 | * in the 2000-2099 range, so any value less than 100 is invalid. |
| 339 | */ |
| 340 | if (tm->tm_year < 100) |
| 341 | return -EINVAL; |
| 342 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 343 | regs[RV3029_W_SEC-RV3029_W_SEC] = bin2bcd(tm->tm_sec); |
| 344 | regs[RV3029_W_MINUTES-RV3029_W_SEC] = bin2bcd(tm->tm_min); |
| 345 | regs[RV3029_W_HOURS-RV3029_W_SEC] = bin2bcd(tm->tm_hour); |
| 346 | regs[RV3029_W_DATE-RV3029_W_SEC] = bin2bcd(tm->tm_mday); |
| 347 | regs[RV3029_W_MONTHS-RV3029_W_SEC] = bin2bcd(tm->tm_mon+1); |
| 348 | regs[RV3029_W_DAYS-RV3029_W_SEC] = bin2bcd((tm->tm_wday & 7)+1); |
| 349 | regs[RV3029_W_YEARS-RV3029_W_SEC] = bin2bcd(tm->tm_year - 100); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 350 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 351 | ret = rv3029_i2c_write_regs(client, RV3029_W_SEC, regs, |
| 352 | RV3029_WATCH_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 353 | if (ret < 0) |
| 354 | return ret; |
| 355 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 356 | ret = rv3029_i2c_get_sr(client, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 357 | if (ret < 0) { |
| 358 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| 359 | return ret; |
| 360 | } |
| 361 | /* clear PON bit */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 362 | ret = rv3029_i2c_set_sr(client, (regs[0] & ~RV3029_STATUS_PON)); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 363 | if (ret < 0) { |
| 364 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 371 | static int rv3029_rtc_set_time(struct device *dev, struct rtc_time *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 372 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 373 | return rv3029_i2c_set_time(to_i2c_client(dev), tm); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 376 | static const struct rtc_class_ops rv3029_rtc_ops = { |
| 377 | .read_time = rv3029_rtc_read_time, |
| 378 | .set_time = rv3029_rtc_set_time, |
| 379 | .read_alarm = rv3029_rtc_read_alarm, |
| 380 | .set_alarm = rv3029_rtc_set_alarm, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 381 | }; |
| 382 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 383 | static struct i2c_device_id rv3029_id[] = { |
Michael Büsch | baba623 | 2016-03-04 22:39:17 +0100 | [diff] [blame^] | 384 | { "rv3029", 0 }, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 385 | { "rv3029c2", 0 }, |
| 386 | { } |
| 387 | }; |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 388 | MODULE_DEVICE_TABLE(i2c, rv3029_id); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 389 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 390 | static int rv3029_probe(struct i2c_client *client, |
| 391 | const struct i2c_device_id *id) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 392 | { |
| 393 | struct rtc_device *rtc; |
| 394 | int rc = 0; |
| 395 | u8 buf[1]; |
| 396 | |
| 397 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL)) |
| 398 | return -ENODEV; |
| 399 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 400 | rc = rv3029_i2c_get_sr(client, buf); |
Gregory Hermant | 67ab244 | 2014-04-03 14:50:17 -0700 | [diff] [blame] | 401 | if (rc < 0) { |
| 402 | dev_err(&client->dev, "reading status failed\n"); |
| 403 | return rc; |
| 404 | } |
| 405 | |
Jingoo Han | 3d7068c | 2013-04-29 16:19:48 -0700 | [diff] [blame] | 406 | rtc = devm_rtc_device_register(&client->dev, client->name, |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 407 | &rv3029_rtc_ops, THIS_MODULE); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 408 | |
| 409 | if (IS_ERR(rtc)) |
| 410 | return PTR_ERR(rtc); |
| 411 | |
| 412 | i2c_set_clientdata(client, rtc); |
| 413 | |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 414 | return 0; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 415 | } |
| 416 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 417 | static struct i2c_driver rv3029_driver = { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 418 | .driver = { |
| 419 | .name = "rtc-rv3029c2", |
| 420 | }, |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 421 | .probe = rv3029_probe, |
| 422 | .id_table = rv3029_id, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 423 | }; |
| 424 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 425 | module_i2c_driver(rv3029_driver); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 426 | |
| 427 | MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>"); |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 428 | MODULE_DESCRIPTION("Micro Crystal RV3029 RTC driver"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 429 | MODULE_LICENSE("GPL"); |