Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 1 | /* |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 2 | * Micro Crystal RV-3029 / RV-3049 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> |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 5 | * Michael Buesch <m@bues.ch> |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 6 | * |
| 7 | * based on previously existing rtc class drivers |
| 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 | * |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/i2c.h> |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 17 | #include <linux/spi/spi.h> |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 18 | #include <linux/bcd.h> |
| 19 | #include <linux/rtc.h> |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 20 | #include <linux/delay.h> |
| 21 | #include <linux/of.h> |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 22 | #include <linux/hwmon.h> |
| 23 | #include <linux/hwmon-sysfs.h> |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 24 | #include <linux/regmap.h> |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 25 | |
| 26 | /* Register map */ |
| 27 | /* control section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 28 | #define RV3029_ONOFF_CTRL 0x00 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 29 | #define RV3029_ONOFF_CTRL_WE BIT(0) |
| 30 | #define RV3029_ONOFF_CTRL_TE BIT(1) |
| 31 | #define RV3029_ONOFF_CTRL_TAR BIT(2) |
| 32 | #define RV3029_ONOFF_CTRL_EERE BIT(3) |
| 33 | #define RV3029_ONOFF_CTRL_SRON BIT(4) |
| 34 | #define RV3029_ONOFF_CTRL_TD0 BIT(5) |
| 35 | #define RV3029_ONOFF_CTRL_TD1 BIT(6) |
| 36 | #define RV3029_ONOFF_CTRL_CLKINT BIT(7) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 37 | #define RV3029_IRQ_CTRL 0x01 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 38 | #define RV3029_IRQ_CTRL_AIE BIT(0) |
| 39 | #define RV3029_IRQ_CTRL_TIE BIT(1) |
| 40 | #define RV3029_IRQ_CTRL_V1IE BIT(2) |
| 41 | #define RV3029_IRQ_CTRL_V2IE BIT(3) |
| 42 | #define RV3029_IRQ_CTRL_SRIE BIT(4) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 43 | #define RV3029_IRQ_FLAGS 0x02 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 44 | #define RV3029_IRQ_FLAGS_AF BIT(0) |
| 45 | #define RV3029_IRQ_FLAGS_TF BIT(1) |
| 46 | #define RV3029_IRQ_FLAGS_V1IF BIT(2) |
| 47 | #define RV3029_IRQ_FLAGS_V2IF BIT(3) |
| 48 | #define RV3029_IRQ_FLAGS_SRF BIT(4) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 49 | #define RV3029_STATUS 0x03 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 50 | #define RV3029_STATUS_VLOW1 BIT(2) |
| 51 | #define RV3029_STATUS_VLOW2 BIT(3) |
| 52 | #define RV3029_STATUS_SR BIT(4) |
| 53 | #define RV3029_STATUS_PON BIT(5) |
| 54 | #define RV3029_STATUS_EEBUSY BIT(7) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 55 | #define RV3029_RST_CTRL 0x04 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 56 | #define RV3029_RST_CTRL_SYSR BIT(4) |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 57 | #define RV3029_CONTROL_SECTION_LEN 0x05 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 58 | |
| 59 | /* watch section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 60 | #define RV3029_W_SEC 0x08 |
| 61 | #define RV3029_W_MINUTES 0x09 |
| 62 | #define RV3029_W_HOURS 0x0A |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 63 | #define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */ |
| 64 | #define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 65 | #define RV3029_W_DATE 0x0B |
| 66 | #define RV3029_W_DAYS 0x0C |
| 67 | #define RV3029_W_MONTHS 0x0D |
| 68 | #define RV3029_W_YEARS 0x0E |
| 69 | #define RV3029_WATCH_SECTION_LEN 0x07 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 70 | |
| 71 | /* alarm section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 72 | #define RV3029_A_SC 0x10 |
| 73 | #define RV3029_A_MN 0x11 |
| 74 | #define RV3029_A_HR 0x12 |
| 75 | #define RV3029_A_DT 0x13 |
| 76 | #define RV3029_A_DW 0x14 |
| 77 | #define RV3029_A_MO 0x15 |
| 78 | #define RV3029_A_YR 0x16 |
| 79 | #define RV3029_ALARM_SECTION_LEN 0x07 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 80 | |
| 81 | /* timer section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 82 | #define RV3029_TIMER_LOW 0x18 |
| 83 | #define RV3029_TIMER_HIGH 0x19 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 84 | |
| 85 | /* temperature section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 86 | #define RV3029_TEMP_PAGE 0x20 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 87 | |
| 88 | /* eeprom data section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 89 | #define RV3029_E2P_EEDATA1 0x28 |
| 90 | #define RV3029_E2P_EEDATA2 0x29 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 91 | #define RV3029_E2PDATA_SECTION_LEN 0x02 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 92 | |
| 93 | /* eeprom control section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 94 | #define RV3029_CONTROL_E2P_EECTRL 0x30 |
Michael Büsch | 7697de3 | 2016-03-04 22:39:49 +0100 | [diff] [blame] | 95 | #define RV3029_EECTRL_THP BIT(0) /* temp scan interval */ |
| 96 | #define RV3029_EECTRL_THE BIT(1) /* thermometer enable */ |
| 97 | #define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */ |
| 98 | #define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */ |
| 99 | #define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */ |
| 100 | #define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */ |
| 101 | #define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */ |
| 102 | #define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */ |
| 103 | #define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\ |
| 104 | RV3029_TRICKLE_5K |\ |
| 105 | RV3029_TRICKLE_20K |\ |
| 106 | RV3029_TRICKLE_80K) |
| 107 | #define RV3029_TRICKLE_SHIFT 4 |
| 108 | #define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */ |
| 109 | #define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */ |
| 110 | #define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */ |
| 111 | #define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */ |
| 112 | #define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */ |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 113 | |
| 114 | /* user ram section */ |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 115 | #define RV3029_USR1_RAM_PAGE 0x38 |
| 116 | #define RV3029_USR1_SECTION_LEN 0x04 |
| 117 | #define RV3029_USR2_RAM_PAGE 0x3C |
| 118 | #define RV3029_USR2_SECTION_LEN 0x04 |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 119 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 120 | struct rv3029_data { |
| 121 | struct device *dev; |
| 122 | struct rtc_device *rtc; |
| 123 | struct regmap *regmap; |
| 124 | int irq; |
| 125 | }; |
| 126 | |
| 127 | static int rv3029_read_regs(struct device *dev, u8 reg, u8 *buf, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 128 | unsigned len) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 129 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 130 | struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 131 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 132 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
| 133 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 134 | return -EINVAL; |
| 135 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 136 | return regmap_bulk_read(rv3029->regmap, reg, buf, len); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 139 | static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[], |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 140 | unsigned len) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 141 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 142 | struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
| 143 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 144 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
| 145 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 146 | return -EINVAL; |
| 147 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 148 | return regmap_bulk_write(rv3029->regmap, reg, buf, len); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 151 | static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set) |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 152 | { |
| 153 | u8 buf; |
| 154 | int ret; |
| 155 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 156 | ret = rv3029_read_regs(dev, reg, &buf, 1); |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 157 | if (ret < 0) |
| 158 | return ret; |
| 159 | buf &= ~mask; |
| 160 | buf |= set & mask; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 161 | ret = rv3029_write_regs(dev, reg, &buf, 1); |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 162 | if (ret < 0) |
| 163 | return ret; |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 168 | static int rv3029_get_sr(struct device *dev, u8 *buf) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 169 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 170 | int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 171 | |
| 172 | if (ret < 0) |
| 173 | return -EIO; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 174 | dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 175 | return 0; |
| 176 | } |
| 177 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 178 | static int rv3029_set_sr(struct device *dev, u8 val) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 179 | { |
| 180 | u8 buf[1]; |
| 181 | int sr; |
| 182 | |
| 183 | buf[0] = val; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 184 | sr = rv3029_write_regs(dev, RV3029_STATUS, buf, 1); |
| 185 | dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 186 | if (sr < 0) |
| 187 | return -EIO; |
| 188 | return 0; |
| 189 | } |
| 190 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 191 | static int rv3029_eeprom_busywait(struct device *dev) |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 192 | { |
| 193 | int i, ret; |
| 194 | u8 sr; |
| 195 | |
| 196 | for (i = 100; i > 0; i--) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 197 | ret = rv3029_get_sr(dev, &sr); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 198 | if (ret < 0) |
| 199 | break; |
| 200 | if (!(sr & RV3029_STATUS_EEBUSY)) |
| 201 | break; |
| 202 | usleep_range(1000, 10000); |
| 203 | } |
| 204 | if (i <= 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 205 | dev_err(dev, "EEPROM busy wait timeout.\n"); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 206 | return -ETIMEDOUT; |
| 207 | } |
| 208 | |
| 209 | return ret; |
| 210 | } |
| 211 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 212 | static int rv3029_eeprom_exit(struct device *dev) |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 213 | { |
| 214 | /* Re-enable eeprom refresh */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 215 | return rv3029_update_bits(dev, RV3029_ONOFF_CTRL, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 216 | RV3029_ONOFF_CTRL_EERE, |
| 217 | RV3029_ONOFF_CTRL_EERE); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 218 | } |
| 219 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 220 | static int rv3029_eeprom_enter(struct device *dev) |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 221 | { |
| 222 | int ret; |
| 223 | u8 sr; |
| 224 | |
| 225 | /* Check whether we are in the allowed voltage range. */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 226 | ret = rv3029_get_sr(dev, &sr); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 227 | if (ret < 0) |
| 228 | return ret; |
| 229 | if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { |
| 230 | /* We clear the bits and retry once just in case |
| 231 | * we had a brown out in early startup. |
| 232 | */ |
| 233 | sr &= ~RV3029_STATUS_VLOW1; |
| 234 | sr &= ~RV3029_STATUS_VLOW2; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 235 | ret = rv3029_set_sr(dev, sr); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 236 | if (ret < 0) |
| 237 | return ret; |
| 238 | usleep_range(1000, 10000); |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 239 | ret = rv3029_get_sr(dev, &sr); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 240 | if (ret < 0) |
| 241 | return ret; |
| 242 | if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 243 | dev_err(dev, |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 244 | "Supply voltage is too low to safely access the EEPROM.\n"); |
| 245 | return -ENODEV; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | /* Disable eeprom refresh. */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 250 | ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE, |
| 251 | 0); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 252 | if (ret < 0) |
| 253 | return ret; |
| 254 | |
| 255 | /* Wait for any previous eeprom accesses to finish. */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 256 | ret = rv3029_eeprom_busywait(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 257 | if (ret < 0) |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 258 | rv3029_eeprom_exit(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 259 | |
| 260 | return ret; |
| 261 | } |
| 262 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 263 | static int rv3029_eeprom_read(struct device *dev, u8 reg, |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 264 | u8 buf[], size_t len) |
| 265 | { |
| 266 | int ret, err; |
| 267 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 268 | err = rv3029_eeprom_enter(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 269 | if (err < 0) |
| 270 | return err; |
| 271 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 272 | ret = rv3029_read_regs(dev, reg, buf, len); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 273 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 274 | err = rv3029_eeprom_exit(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 275 | if (err < 0) |
| 276 | return err; |
| 277 | |
| 278 | return ret; |
| 279 | } |
| 280 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 281 | static int rv3029_eeprom_write(struct device *dev, u8 reg, |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 282 | u8 const buf[], size_t len) |
| 283 | { |
| 284 | int ret, err; |
| 285 | size_t i; |
| 286 | u8 tmp; |
| 287 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 288 | err = rv3029_eeprom_enter(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 289 | if (err < 0) |
| 290 | return err; |
| 291 | |
| 292 | for (i = 0; i < len; i++, reg++) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 293 | ret = rv3029_read_regs(dev, reg, &tmp, 1); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 294 | if (ret < 0) |
| 295 | break; |
| 296 | if (tmp != buf[i]) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 297 | ret = rv3029_write_regs(dev, reg, &buf[i], 1); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 298 | if (ret < 0) |
| 299 | break; |
| 300 | } |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 301 | ret = rv3029_eeprom_busywait(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 302 | if (ret < 0) |
| 303 | break; |
| 304 | } |
| 305 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 306 | err = rv3029_eeprom_exit(dev); |
Michael Büsch | a7f6e28 | 2016-03-04 22:40:55 +0100 | [diff] [blame] | 307 | if (err < 0) |
| 308 | return err; |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 313 | static int rv3029_eeprom_update_bits(struct device *dev, |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 314 | u8 reg, u8 mask, u8 set) |
| 315 | { |
| 316 | u8 buf; |
| 317 | int ret; |
| 318 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 319 | ret = rv3029_eeprom_read(dev, reg, &buf, 1); |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 320 | if (ret < 0) |
| 321 | return ret; |
| 322 | buf &= ~mask; |
| 323 | buf |= set & mask; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 324 | ret = rv3029_eeprom_write(dev, reg, &buf, 1); |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 325 | if (ret < 0) |
| 326 | return ret; |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 331 | static int rv3029_read_time(struct device *dev, struct rtc_time *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 332 | { |
| 333 | u8 buf[1]; |
| 334 | int ret; |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 335 | u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 336 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 337 | ret = rv3029_get_sr(dev, buf); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 338 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 339 | dev_err(dev, "%s: reading SR failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 340 | return -EIO; |
| 341 | } |
| 342 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 343 | ret = rv3029_read_regs(dev, RV3029_W_SEC, regs, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 344 | RV3029_WATCH_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 345 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 346 | dev_err(dev, "%s: reading RTC section failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 347 | return ret; |
| 348 | } |
| 349 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 350 | tm->tm_sec = bcd2bin(regs[RV3029_W_SEC-RV3029_W_SEC]); |
| 351 | tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES-RV3029_W_SEC]); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 352 | |
| 353 | /* HR field has a more complex interpretation */ |
| 354 | { |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 355 | const u8 _hr = regs[RV3029_W_HOURS-RV3029_W_SEC]; |
| 356 | |
| 357 | if (_hr & RV3029_REG_HR_12_24) { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 358 | /* 12h format */ |
| 359 | tm->tm_hour = bcd2bin(_hr & 0x1f); |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 360 | if (_hr & RV3029_REG_HR_PM) /* PM flag set */ |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 361 | tm->tm_hour += 12; |
| 362 | } else /* 24h format */ |
| 363 | tm->tm_hour = bcd2bin(_hr & 0x3f); |
| 364 | } |
| 365 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 366 | tm->tm_mday = bcd2bin(regs[RV3029_W_DATE-RV3029_W_SEC]); |
| 367 | tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS-RV3029_W_SEC]) - 1; |
| 368 | tm->tm_year = bcd2bin(regs[RV3029_W_YEARS-RV3029_W_SEC]) + 100; |
| 369 | tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS-RV3029_W_SEC]) - 1; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 374 | static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 375 | { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 376 | struct rtc_time *const tm = &alarm->time; |
| 377 | int ret; |
| 378 | u8 regs[8]; |
| 379 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 380 | ret = rv3029_get_sr(dev, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 381 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 382 | dev_err(dev, "%s: reading SR failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 383 | return -EIO; |
| 384 | } |
| 385 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 386 | ret = rv3029_read_regs(dev, RV3029_A_SC, regs, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 387 | RV3029_ALARM_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 388 | |
| 389 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 390 | dev_err(dev, "%s: reading alarm section failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 391 | return ret; |
| 392 | } |
| 393 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 394 | tm->tm_sec = bcd2bin(regs[RV3029_A_SC-RV3029_A_SC] & 0x7f); |
| 395 | tm->tm_min = bcd2bin(regs[RV3029_A_MN-RV3029_A_SC] & 0x7f); |
| 396 | tm->tm_hour = bcd2bin(regs[RV3029_A_HR-RV3029_A_SC] & 0x3f); |
| 397 | tm->tm_mday = bcd2bin(regs[RV3029_A_DT-RV3029_A_SC] & 0x3f); |
| 398 | tm->tm_mon = bcd2bin(regs[RV3029_A_MO-RV3029_A_SC] & 0x1f) - 1; |
| 399 | tm->tm_year = bcd2bin(regs[RV3029_A_YR-RV3029_A_SC] & 0x7f) + 100; |
| 400 | 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] | 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 405 | static int rv3029_rtc_alarm_set_irq(struct device *dev, int enable) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 406 | { |
| 407 | int ret; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 408 | |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 409 | /* enable/disable AIE irq */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 410 | ret = rv3029_update_bits(dev, RV3029_IRQ_CTRL, RV3029_IRQ_CTRL_AIE, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 411 | (enable ? RV3029_IRQ_CTRL_AIE : 0)); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 412 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 413 | dev_err(dev, "can't update INT reg\n"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 414 | return ret; |
| 415 | } |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 420 | static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 421 | { |
| 422 | struct rtc_time *const tm = &alarm->time; |
| 423 | int ret; |
| 424 | u8 regs[8]; |
| 425 | |
| 426 | /* |
| 427 | * The clock has an 8 bit wide bcd-coded register (they never learn) |
| 428 | * for the year. tm_year is an offset from 1900 and we are interested |
| 429 | * in the 2000-2099 range, so any value less than 100 is invalid. |
| 430 | */ |
| 431 | if (tm->tm_year < 100) |
| 432 | return -EINVAL; |
| 433 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 434 | ret = rv3029_get_sr(dev, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 435 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 436 | dev_err(dev, "%s: reading SR failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 437 | return -EIO; |
| 438 | } |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 439 | regs[RV3029_A_SC-RV3029_A_SC] = bin2bcd(tm->tm_sec & 0x7f); |
| 440 | regs[RV3029_A_MN-RV3029_A_SC] = bin2bcd(tm->tm_min & 0x7f); |
| 441 | regs[RV3029_A_HR-RV3029_A_SC] = bin2bcd(tm->tm_hour & 0x3f); |
| 442 | regs[RV3029_A_DT-RV3029_A_SC] = bin2bcd(tm->tm_mday & 0x3f); |
| 443 | regs[RV3029_A_MO-RV3029_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1); |
| 444 | regs[RV3029_A_DW-RV3029_A_SC] = bin2bcd((tm->tm_wday & 7) - 1); |
| 445 | 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] | 446 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 447 | ret = rv3029_write_regs(dev, RV3029_A_SC, regs, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 448 | RV3029_ALARM_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 449 | if (ret < 0) |
| 450 | return ret; |
| 451 | |
| 452 | if (alarm->enabled) { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 453 | /* clear AF flag */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 454 | ret = rv3029_update_bits(dev, RV3029_IRQ_FLAGS, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 455 | RV3029_IRQ_FLAGS_AF, 0); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 456 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 457 | dev_err(dev, "can't clear alarm flag\n"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 458 | return ret; |
| 459 | } |
| 460 | /* enable AIE irq */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 461 | ret = rv3029_rtc_alarm_set_irq(dev, 1); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 462 | if (ret) |
| 463 | return ret; |
| 464 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 465 | dev_dbg(dev, "alarm IRQ armed\n"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 466 | } else { |
| 467 | /* disable AIE irq */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 468 | ret = rv3029_rtc_alarm_set_irq(dev, 0); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 469 | if (ret) |
| 470 | return ret; |
| 471 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 472 | dev_dbg(dev, "alarm IRQ disabled\n"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 478 | static int rv3029_set_time(struct device *dev, struct rtc_time *tm) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 479 | { |
| 480 | u8 regs[8]; |
| 481 | int ret; |
| 482 | |
| 483 | /* |
| 484 | * The clock has an 8 bit wide bcd-coded register (they never learn) |
| 485 | * for the year. tm_year is an offset from 1900 and we are interested |
| 486 | * in the 2000-2099 range, so any value less than 100 is invalid. |
| 487 | */ |
| 488 | if (tm->tm_year < 100) |
| 489 | return -EINVAL; |
| 490 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 491 | regs[RV3029_W_SEC-RV3029_W_SEC] = bin2bcd(tm->tm_sec); |
| 492 | regs[RV3029_W_MINUTES-RV3029_W_SEC] = bin2bcd(tm->tm_min); |
| 493 | regs[RV3029_W_HOURS-RV3029_W_SEC] = bin2bcd(tm->tm_hour); |
| 494 | regs[RV3029_W_DATE-RV3029_W_SEC] = bin2bcd(tm->tm_mday); |
| 495 | regs[RV3029_W_MONTHS-RV3029_W_SEC] = bin2bcd(tm->tm_mon+1); |
| 496 | regs[RV3029_W_DAYS-RV3029_W_SEC] = bin2bcd((tm->tm_wday & 7)+1); |
| 497 | regs[RV3029_W_YEARS-RV3029_W_SEC] = bin2bcd(tm->tm_year - 100); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 498 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 499 | ret = rv3029_write_regs(dev, RV3029_W_SEC, regs, |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 500 | RV3029_WATCH_SECTION_LEN); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 501 | if (ret < 0) |
| 502 | return ret; |
| 503 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 504 | ret = rv3029_get_sr(dev, regs); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 505 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 506 | dev_err(dev, "%s: reading SR failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 507 | return ret; |
| 508 | } |
| 509 | /* clear PON bit */ |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 510 | ret = rv3029_set_sr(dev, (regs[0] & ~RV3029_STATUS_PON)); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 511 | if (ret < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 512 | dev_err(dev, "%s: reading SR failed\n", __func__); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | return 0; |
| 517 | } |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 518 | static const struct rv3029_trickle_tab_elem { |
| 519 | u32 r; /* resistance in ohms */ |
| 520 | u8 conf; /* trickle config bits */ |
| 521 | } rv3029_trickle_tab[] = { |
| 522 | { |
| 523 | .r = 1076, |
| 524 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
| 525 | RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, |
| 526 | }, { |
| 527 | .r = 1091, |
| 528 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
| 529 | RV3029_TRICKLE_20K, |
| 530 | }, { |
| 531 | .r = 1137, |
| 532 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | |
| 533 | RV3029_TRICKLE_80K, |
| 534 | }, { |
| 535 | .r = 1154, |
| 536 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K, |
| 537 | }, { |
| 538 | .r = 1371, |
| 539 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K | |
| 540 | RV3029_TRICKLE_80K, |
| 541 | }, { |
| 542 | .r = 1395, |
| 543 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K, |
| 544 | }, { |
| 545 | .r = 1472, |
| 546 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K, |
| 547 | }, { |
| 548 | .r = 1500, |
| 549 | .conf = RV3029_TRICKLE_1K, |
| 550 | }, { |
| 551 | .r = 3810, |
| 552 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K | |
| 553 | RV3029_TRICKLE_80K, |
| 554 | }, { |
| 555 | .r = 4000, |
| 556 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K, |
| 557 | }, { |
| 558 | .r = 4706, |
| 559 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K, |
| 560 | }, { |
| 561 | .r = 5000, |
| 562 | .conf = RV3029_TRICKLE_5K, |
| 563 | }, { |
| 564 | .r = 16000, |
| 565 | .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, |
| 566 | }, { |
| 567 | .r = 20000, |
| 568 | .conf = RV3029_TRICKLE_20K, |
| 569 | }, { |
| 570 | .r = 80000, |
| 571 | .conf = RV3029_TRICKLE_80K, |
| 572 | }, |
| 573 | }; |
| 574 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 575 | static void rv3029_trickle_config(struct device *dev) |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 576 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 577 | struct device_node *of_node = dev->of_node; |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 578 | const struct rv3029_trickle_tab_elem *elem; |
| 579 | int i, err; |
| 580 | u32 ohms; |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 581 | u8 trickle_set_bits; |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 582 | |
| 583 | if (!of_node) |
| 584 | return; |
| 585 | |
| 586 | /* Configure the trickle charger. */ |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 587 | err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms); |
| 588 | if (err) { |
| 589 | /* Disable trickle charger. */ |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 590 | trickle_set_bits = 0; |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 591 | } else { |
| 592 | /* Enable trickle charger. */ |
| 593 | for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) { |
| 594 | elem = &rv3029_trickle_tab[i]; |
| 595 | if (elem->r >= ohms) |
| 596 | break; |
| 597 | } |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 598 | trickle_set_bits = elem->conf; |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 599 | dev_info(dev, |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 600 | "Trickle charger enabled at %d ohms resistance.\n", |
| 601 | elem->r); |
| 602 | } |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 603 | err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL, |
Michael Büsch | 39387dc | 2016-03-10 18:34:23 +0100 | [diff] [blame] | 604 | RV3029_TRICKLE_MASK, |
| 605 | trickle_set_bits); |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 606 | if (err < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 607 | dev_err(dev, "Failed to update trickle charger config\n"); |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 608 | } |
| 609 | } |
| 610 | |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 611 | #ifdef CONFIG_RTC_DRV_RV3029_HWMON |
| 612 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 613 | static int rv3029_read_temp(struct device *dev, int *temp_mC) |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 614 | { |
| 615 | int ret; |
| 616 | u8 temp; |
| 617 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 618 | ret = rv3029_read_regs(dev, RV3029_TEMP_PAGE, &temp, 1); |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 619 | if (ret < 0) |
| 620 | return ret; |
| 621 | |
| 622 | *temp_mC = ((int)temp - 60) * 1000; |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | static ssize_t rv3029_hwmon_show_temp(struct device *dev, |
| 628 | struct device_attribute *attr, |
| 629 | char *buf) |
| 630 | { |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 631 | int ret, temp_mC; |
| 632 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 633 | ret = rv3029_read_temp(dev, &temp_mC); |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 634 | if (ret < 0) |
| 635 | return ret; |
| 636 | |
| 637 | return sprintf(buf, "%d\n", temp_mC); |
| 638 | } |
| 639 | |
| 640 | static ssize_t rv3029_hwmon_set_update_interval(struct device *dev, |
| 641 | struct device_attribute *attr, |
| 642 | const char *buf, |
| 643 | size_t count) |
| 644 | { |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 645 | unsigned long interval_ms; |
| 646 | int ret; |
| 647 | u8 th_set_bits = 0; |
| 648 | |
| 649 | ret = kstrtoul(buf, 10, &interval_ms); |
| 650 | if (ret < 0) |
| 651 | return ret; |
| 652 | |
| 653 | if (interval_ms != 0) { |
| 654 | th_set_bits |= RV3029_EECTRL_THE; |
| 655 | if (interval_ms >= 16000) |
| 656 | th_set_bits |= RV3029_EECTRL_THP; |
| 657 | } |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 658 | ret = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL, |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 659 | RV3029_EECTRL_THE | RV3029_EECTRL_THP, |
| 660 | th_set_bits); |
| 661 | if (ret < 0) |
| 662 | return ret; |
| 663 | |
| 664 | return count; |
| 665 | } |
| 666 | |
| 667 | static ssize_t rv3029_hwmon_show_update_interval(struct device *dev, |
| 668 | struct device_attribute *attr, |
| 669 | char *buf) |
| 670 | { |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 671 | int ret, interval_ms; |
| 672 | u8 eectrl; |
| 673 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 674 | ret = rv3029_eeprom_read(dev, RV3029_CONTROL_E2P_EECTRL, |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 675 | &eectrl, 1); |
| 676 | if (ret < 0) |
| 677 | return ret; |
| 678 | |
| 679 | if (eectrl & RV3029_EECTRL_THE) { |
| 680 | if (eectrl & RV3029_EECTRL_THP) |
| 681 | interval_ms = 16000; |
| 682 | else |
| 683 | interval_ms = 1000; |
| 684 | } else { |
| 685 | interval_ms = 0; |
| 686 | } |
| 687 | |
| 688 | return sprintf(buf, "%d\n", interval_ms); |
| 689 | } |
| 690 | |
| 691 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp, |
| 692 | NULL, 0); |
| 693 | static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, |
| 694 | rv3029_hwmon_show_update_interval, |
| 695 | rv3029_hwmon_set_update_interval, 0); |
| 696 | |
| 697 | static struct attribute *rv3029_hwmon_attrs[] = { |
| 698 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 699 | &sensor_dev_attr_update_interval.dev_attr.attr, |
| 700 | NULL, |
| 701 | }; |
| 702 | ATTRIBUTE_GROUPS(rv3029_hwmon); |
| 703 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 704 | static void rv3029_hwmon_register(struct device *dev, const char *name) |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 705 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 706 | struct rv3029_data *rv3029 = dev_get_drvdata(dev); |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 707 | struct device *hwmon_dev; |
| 708 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 709 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029, |
| 710 | rv3029_hwmon_groups); |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 711 | if (IS_ERR(hwmon_dev)) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 712 | dev_warn(dev, "unable to register hwmon device %ld\n", |
Mylène Josserand | 4e7f1a6 | 2016-05-03 11:54:32 +0200 | [diff] [blame] | 713 | PTR_ERR(hwmon_dev)); |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 714 | } |
| 715 | } |
| 716 | |
| 717 | #else /* CONFIG_RTC_DRV_RV3029_HWMON */ |
| 718 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 719 | static void rv3029_hwmon_register(struct device *dev, const char *name) |
Michael Büsch | a696b31 | 2016-03-10 18:34:46 +0100 | [diff] [blame] | 720 | { |
| 721 | } |
| 722 | |
| 723 | #endif /* CONFIG_RTC_DRV_RV3029_HWMON */ |
| 724 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 725 | static const struct rtc_class_ops rv3029_rtc_ops = { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 726 | .read_time = rv3029_read_time, |
| 727 | .set_time = rv3029_set_time, |
| 728 | .read_alarm = rv3029_read_alarm, |
| 729 | .set_alarm = rv3029_set_alarm, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 730 | }; |
| 731 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 732 | static struct i2c_device_id rv3029_id[] = { |
Michael Büsch | baba623 | 2016-03-04 22:39:17 +0100 | [diff] [blame] | 733 | { "rv3029", 0 }, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 734 | { "rv3029c2", 0 }, |
| 735 | { } |
| 736 | }; |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 737 | MODULE_DEVICE_TABLE(i2c, rv3029_id); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 738 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 739 | static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq, |
| 740 | const char *name) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 741 | { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 742 | struct rv3029_data *rv3029; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 743 | int rc = 0; |
| 744 | u8 buf[1]; |
| 745 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 746 | rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL); |
| 747 | if (!rv3029) |
| 748 | return -ENOMEM; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 749 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 750 | rv3029->regmap = regmap; |
| 751 | rv3029->irq = irq; |
| 752 | rv3029->dev = dev; |
| 753 | dev_set_drvdata(dev, rv3029); |
| 754 | |
| 755 | rc = rv3029_get_sr(dev, buf); |
Gregory Hermant | 67ab244 | 2014-04-03 14:50:17 -0700 | [diff] [blame] | 756 | if (rc < 0) { |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 757 | dev_err(dev, "reading status failed\n"); |
Gregory Hermant | 67ab244 | 2014-04-03 14:50:17 -0700 | [diff] [blame] | 758 | return rc; |
| 759 | } |
| 760 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 761 | rv3029_trickle_config(dev); |
| 762 | rv3029_hwmon_register(dev, name); |
Michael Büsch | e27e216 | 2016-03-04 22:41:19 +0100 | [diff] [blame] | 763 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 764 | rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops, |
| 765 | THIS_MODULE); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 766 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 767 | return PTR_ERR_OR_ZERO(rv3029->rtc); |
| 768 | } |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 769 | |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 770 | #if IS_ENABLED(CONFIG_I2C) |
| 771 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 772 | static int rv3029_i2c_probe(struct i2c_client *client, |
| 773 | const struct i2c_device_id *id) |
| 774 | { |
| 775 | struct regmap *regmap; |
| 776 | static const struct regmap_config config = { |
| 777 | .reg_bits = 8, |
| 778 | .val_bits = 8, |
| 779 | }; |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 780 | |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 781 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK | |
| 782 | I2C_FUNC_SMBUS_BYTE)) { |
| 783 | dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n"); |
| 784 | return -ENODEV; |
| 785 | } |
| 786 | |
| 787 | regmap = devm_regmap_init_i2c(client, &config); |
| 788 | if (IS_ERR(regmap)) { |
| 789 | dev_err(&client->dev, "%s: regmap allocation failed: %ld\n", |
| 790 | __func__, PTR_ERR(regmap)); |
| 791 | return PTR_ERR(regmap); |
| 792 | } |
| 793 | |
| 794 | return rv3029_probe(&client->dev, regmap, client->irq, client->name); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 795 | } |
| 796 | |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 797 | static struct i2c_driver rv3029_driver = { |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 798 | .driver = { |
| 799 | .name = "rtc-rv3029c2", |
| 800 | }, |
Mylène Josserand | e6e3808 | 2016-05-03 11:54:33 +0200 | [diff] [blame] | 801 | .probe = rv3029_i2c_probe, |
Michael Büsch | aba39d2 | 2016-03-04 22:38:45 +0100 | [diff] [blame] | 802 | .id_table = rv3029_id, |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 803 | }; |
| 804 | |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 805 | static int rv3029_register_driver(void) |
| 806 | { |
| 807 | return i2c_add_driver(&rv3029_driver); |
| 808 | } |
| 809 | |
| 810 | static void rv3029_unregister_driver(void) |
| 811 | { |
| 812 | i2c_del_driver(&rv3029_driver); |
| 813 | } |
| 814 | |
| 815 | #else |
| 816 | |
| 817 | static int rv3029_register_driver(void) |
| 818 | { |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | static void rv3029_unregister_driver(void) |
| 823 | { |
| 824 | } |
| 825 | |
| 826 | #endif |
| 827 | |
| 828 | #if IS_ENABLED(CONFIG_SPI_MASTER) |
| 829 | |
| 830 | static int rv3049_probe(struct spi_device *spi) |
| 831 | { |
| 832 | static const struct regmap_config config = { |
| 833 | .reg_bits = 8, |
| 834 | .val_bits = 8, |
| 835 | }; |
| 836 | struct regmap *regmap; |
| 837 | |
| 838 | regmap = devm_regmap_init_spi(spi, &config); |
| 839 | if (IS_ERR(regmap)) { |
| 840 | dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", |
| 841 | __func__, PTR_ERR(regmap)); |
| 842 | return PTR_ERR(regmap); |
| 843 | } |
| 844 | |
| 845 | return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049"); |
| 846 | } |
| 847 | |
| 848 | static struct spi_driver rv3049_driver = { |
| 849 | .driver = { |
| 850 | .name = "rv3049", |
| 851 | }, |
| 852 | .probe = rv3049_probe, |
| 853 | }; |
| 854 | |
| 855 | static int rv3049_register_driver(void) |
| 856 | { |
| 857 | return spi_register_driver(&rv3049_driver); |
| 858 | } |
| 859 | |
| 860 | static void rv3049_unregister_driver(void) |
| 861 | { |
| 862 | spi_unregister_driver(&rv3049_driver); |
| 863 | } |
| 864 | |
| 865 | #else |
| 866 | |
| 867 | static int rv3049_register_driver(void) |
| 868 | { |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | static void rv3049_unregister_driver(void) |
| 873 | { |
| 874 | } |
| 875 | |
| 876 | #endif |
| 877 | |
| 878 | static int __init rv30x9_init(void) |
| 879 | { |
| 880 | int ret; |
| 881 | |
| 882 | ret = rv3029_register_driver(); |
| 883 | if (ret) { |
| 884 | pr_err("Failed to register rv3029 driver: %d\n", ret); |
| 885 | return ret; |
| 886 | } |
| 887 | |
| 888 | ret = rv3049_register_driver(); |
| 889 | if (ret) { |
| 890 | pr_err("Failed to register rv3049 driver: %d\n", ret); |
| 891 | rv3029_unregister_driver(); |
| 892 | } |
| 893 | |
| 894 | return ret; |
| 895 | } |
| 896 | module_init(rv30x9_init) |
| 897 | |
| 898 | static void __exit rv30x9_exit(void) |
| 899 | { |
| 900 | rv3049_unregister_driver(); |
| 901 | rv3029_unregister_driver(); |
| 902 | } |
| 903 | module_exit(rv30x9_exit) |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 904 | |
| 905 | MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>"); |
Michael Büsch | 2dca3d9 | 2016-03-04 22:40:30 +0100 | [diff] [blame] | 906 | MODULE_AUTHOR("Michael Buesch <m@bues.ch>"); |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 907 | MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver"); |
Heiko Schocher | 5236523 | 2011-05-26 16:25:05 -0700 | [diff] [blame] | 908 | MODULE_LICENSE("GPL"); |
Mylène Josserand | c2a1c14 | 2016-05-03 11:54:34 +0200 | [diff] [blame^] | 909 | MODULE_ALIAS("spi:rv3049"); |