Thomas Gleixner | 9c92ab6 | 2019-05-29 07:17:56 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 2 | /* |
| 3 | * Haoyu HYM8563 RTC driver |
| 4 | * |
| 5 | * Copyright (C) 2013 MundoReader S.L. |
| 6 | * Author: Heiko Stuebner <heiko@sntech.de> |
| 7 | * |
| 8 | * based on rtc-HYM8563 |
| 9 | * Copyright (C) 2010 ROCKCHIP, Inc. |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/clk-provider.h> |
| 14 | #include <linux/i2c.h> |
| 15 | #include <linux/bcd.h> |
| 16 | #include <linux/rtc.h> |
| 17 | |
| 18 | #define HYM8563_CTL1 0x00 |
| 19 | #define HYM8563_CTL1_TEST BIT(7) |
| 20 | #define HYM8563_CTL1_STOP BIT(5) |
| 21 | #define HYM8563_CTL1_TESTC BIT(3) |
| 22 | |
| 23 | #define HYM8563_CTL2 0x01 |
| 24 | #define HYM8563_CTL2_TI_TP BIT(4) |
| 25 | #define HYM8563_CTL2_AF BIT(3) |
| 26 | #define HYM8563_CTL2_TF BIT(2) |
| 27 | #define HYM8563_CTL2_AIE BIT(1) |
| 28 | #define HYM8563_CTL2_TIE BIT(0) |
| 29 | |
| 30 | #define HYM8563_SEC 0x02 |
| 31 | #define HYM8563_SEC_VL BIT(7) |
| 32 | #define HYM8563_SEC_MASK 0x7f |
| 33 | |
| 34 | #define HYM8563_MIN 0x03 |
| 35 | #define HYM8563_MIN_MASK 0x7f |
| 36 | |
| 37 | #define HYM8563_HOUR 0x04 |
| 38 | #define HYM8563_HOUR_MASK 0x3f |
| 39 | |
| 40 | #define HYM8563_DAY 0x05 |
| 41 | #define HYM8563_DAY_MASK 0x3f |
| 42 | |
| 43 | #define HYM8563_WEEKDAY 0x06 |
| 44 | #define HYM8563_WEEKDAY_MASK 0x07 |
| 45 | |
| 46 | #define HYM8563_MONTH 0x07 |
| 47 | #define HYM8563_MONTH_CENTURY BIT(7) |
| 48 | #define HYM8563_MONTH_MASK 0x1f |
| 49 | |
| 50 | #define HYM8563_YEAR 0x08 |
| 51 | |
| 52 | #define HYM8563_ALM_MIN 0x09 |
| 53 | #define HYM8563_ALM_HOUR 0x0a |
| 54 | #define HYM8563_ALM_DAY 0x0b |
| 55 | #define HYM8563_ALM_WEEK 0x0c |
| 56 | |
| 57 | /* Each alarm check can be disabled by setting this bit in the register */ |
| 58 | #define HYM8563_ALM_BIT_DISABLE BIT(7) |
| 59 | |
| 60 | #define HYM8563_CLKOUT 0x0d |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 61 | #define HYM8563_CLKOUT_ENABLE BIT(7) |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 62 | #define HYM8563_CLKOUT_32768 0 |
| 63 | #define HYM8563_CLKOUT_1024 1 |
| 64 | #define HYM8563_CLKOUT_32 2 |
| 65 | #define HYM8563_CLKOUT_1 3 |
| 66 | #define HYM8563_CLKOUT_MASK 3 |
| 67 | |
| 68 | #define HYM8563_TMR_CTL 0x0e |
| 69 | #define HYM8563_TMR_CTL_ENABLE BIT(7) |
| 70 | #define HYM8563_TMR_CTL_4096 0 |
| 71 | #define HYM8563_TMR_CTL_64 1 |
| 72 | #define HYM8563_TMR_CTL_1 2 |
| 73 | #define HYM8563_TMR_CTL_1_60 3 |
| 74 | #define HYM8563_TMR_CTL_MASK 3 |
| 75 | |
| 76 | #define HYM8563_TMR_CNT 0x0f |
| 77 | |
| 78 | struct hym8563 { |
| 79 | struct i2c_client *client; |
| 80 | struct rtc_device *rtc; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 81 | #ifdef CONFIG_COMMON_CLK |
| 82 | struct clk_hw clkout_hw; |
| 83 | #endif |
| 84 | }; |
| 85 | |
| 86 | /* |
| 87 | * RTC handling |
| 88 | */ |
| 89 | |
| 90 | static int hym8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 91 | { |
| 92 | struct i2c_client *client = to_i2c_client(dev); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 93 | u8 buf[7]; |
| 94 | int ret; |
| 95 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 96 | ret = i2c_smbus_read_i2c_block_data(client, HYM8563_SEC, 7, buf); |
Kangjie Lu | 9a20b5e | 2018-12-25 21:09:11 -0600 | [diff] [blame] | 97 | if (ret < 0) |
| 98 | return ret; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 99 | |
Paul Kocialkowski | e2ed750 | 2019-12-12 16:31:11 +0100 | [diff] [blame] | 100 | if (buf[0] & HYM8563_SEC_VL) { |
| 101 | dev_warn(&client->dev, |
| 102 | "no valid clock/calendar values available\n"); |
| 103 | return -EINVAL; |
| 104 | } |
| 105 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 106 | tm->tm_sec = bcd2bin(buf[0] & HYM8563_SEC_MASK); |
| 107 | tm->tm_min = bcd2bin(buf[1] & HYM8563_MIN_MASK); |
| 108 | tm->tm_hour = bcd2bin(buf[2] & HYM8563_HOUR_MASK); |
| 109 | tm->tm_mday = bcd2bin(buf[3] & HYM8563_DAY_MASK); |
| 110 | tm->tm_wday = bcd2bin(buf[4] & HYM8563_WEEKDAY_MASK); /* 0 = Sun */ |
| 111 | tm->tm_mon = bcd2bin(buf[5] & HYM8563_MONTH_MASK) - 1; /* 0 = Jan */ |
| 112 | tm->tm_year = bcd2bin(buf[6]) + 100; |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int hym8563_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 118 | { |
| 119 | struct i2c_client *client = to_i2c_client(dev); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 120 | u8 buf[7]; |
| 121 | int ret; |
| 122 | |
| 123 | /* Years >= 2100 are to far in the future, 19XX is to early */ |
| 124 | if (tm->tm_year < 100 || tm->tm_year >= 200) |
| 125 | return -EINVAL; |
| 126 | |
| 127 | buf[0] = bin2bcd(tm->tm_sec); |
| 128 | buf[1] = bin2bcd(tm->tm_min); |
| 129 | buf[2] = bin2bcd(tm->tm_hour); |
| 130 | buf[3] = bin2bcd(tm->tm_mday); |
| 131 | buf[4] = bin2bcd(tm->tm_wday); |
| 132 | buf[5] = bin2bcd(tm->tm_mon + 1); |
| 133 | |
| 134 | /* |
| 135 | * While the HYM8563 has a century flag in the month register, |
| 136 | * it does not seem to carry it over a subsequent write/read. |
| 137 | * So we'll limit ourself to 100 years, starting at 2000 for now. |
| 138 | */ |
Alexander Kochetkov | d586126 | 2016-03-06 12:43:57 +0300 | [diff] [blame] | 139 | buf[6] = bin2bcd(tm->tm_year - 100); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 140 | |
| 141 | /* |
| 142 | * CTL1 only contains TEST-mode bits apart from stop, |
| 143 | * so no need to read the value first |
| 144 | */ |
| 145 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, |
| 146 | HYM8563_CTL1_STOP); |
| 147 | if (ret < 0) |
| 148 | return ret; |
| 149 | |
| 150 | ret = i2c_smbus_write_i2c_block_data(client, HYM8563_SEC, 7, buf); |
| 151 | if (ret < 0) |
| 152 | return ret; |
| 153 | |
| 154 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, 0); |
| 155 | if (ret < 0) |
| 156 | return ret; |
| 157 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static int hym8563_rtc_alarm_irq_enable(struct device *dev, |
| 162 | unsigned int enabled) |
| 163 | { |
| 164 | struct i2c_client *client = to_i2c_client(dev); |
| 165 | int data; |
| 166 | |
| 167 | data = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 168 | if (data < 0) |
| 169 | return data; |
| 170 | |
| 171 | if (enabled) |
| 172 | data |= HYM8563_CTL2_AIE; |
| 173 | else |
| 174 | data &= ~HYM8563_CTL2_AIE; |
| 175 | |
| 176 | return i2c_smbus_write_byte_data(client, HYM8563_CTL2, data); |
| 177 | }; |
| 178 | |
| 179 | static int hym8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 180 | { |
| 181 | struct i2c_client *client = to_i2c_client(dev); |
| 182 | struct rtc_time *alm_tm = &alm->time; |
| 183 | u8 buf[4]; |
| 184 | int ret; |
| 185 | |
| 186 | ret = i2c_smbus_read_i2c_block_data(client, HYM8563_ALM_MIN, 4, buf); |
| 187 | if (ret < 0) |
| 188 | return ret; |
| 189 | |
| 190 | /* The alarm only has a minute accuracy */ |
Uwe Kleine-König | bb9dbb0 | 2016-07-11 10:05:28 +0200 | [diff] [blame] | 191 | alm_tm->tm_sec = 0; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 192 | |
| 193 | alm_tm->tm_min = (buf[0] & HYM8563_ALM_BIT_DISABLE) ? |
| 194 | -1 : |
| 195 | bcd2bin(buf[0] & HYM8563_MIN_MASK); |
| 196 | alm_tm->tm_hour = (buf[1] & HYM8563_ALM_BIT_DISABLE) ? |
| 197 | -1 : |
| 198 | bcd2bin(buf[1] & HYM8563_HOUR_MASK); |
| 199 | alm_tm->tm_mday = (buf[2] & HYM8563_ALM_BIT_DISABLE) ? |
| 200 | -1 : |
| 201 | bcd2bin(buf[2] & HYM8563_DAY_MASK); |
| 202 | alm_tm->tm_wday = (buf[3] & HYM8563_ALM_BIT_DISABLE) ? |
| 203 | -1 : |
| 204 | bcd2bin(buf[3] & HYM8563_WEEKDAY_MASK); |
| 205 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 206 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 207 | if (ret < 0) |
| 208 | return ret; |
| 209 | |
| 210 | if (ret & HYM8563_CTL2_AIE) |
| 211 | alm->enabled = 1; |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static int hym8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 217 | { |
| 218 | struct i2c_client *client = to_i2c_client(dev); |
| 219 | struct rtc_time *alm_tm = &alm->time; |
| 220 | u8 buf[4]; |
| 221 | int ret; |
| 222 | |
| 223 | /* |
| 224 | * The alarm has no seconds so deal with it |
| 225 | */ |
| 226 | if (alm_tm->tm_sec) { |
| 227 | alm_tm->tm_sec = 0; |
| 228 | alm_tm->tm_min++; |
| 229 | if (alm_tm->tm_min >= 60) { |
| 230 | alm_tm->tm_min = 0; |
| 231 | alm_tm->tm_hour++; |
| 232 | if (alm_tm->tm_hour >= 24) { |
| 233 | alm_tm->tm_hour = 0; |
| 234 | alm_tm->tm_mday++; |
| 235 | if (alm_tm->tm_mday > 31) |
| 236 | alm_tm->tm_mday = 0; |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 242 | if (ret < 0) |
| 243 | return ret; |
| 244 | |
| 245 | ret &= ~HYM8563_CTL2_AIE; |
| 246 | |
| 247 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL2, ret); |
| 248 | if (ret < 0) |
| 249 | return ret; |
| 250 | |
| 251 | buf[0] = (alm_tm->tm_min < 60 && alm_tm->tm_min >= 0) ? |
| 252 | bin2bcd(alm_tm->tm_min) : HYM8563_ALM_BIT_DISABLE; |
| 253 | |
| 254 | buf[1] = (alm_tm->tm_hour < 24 && alm_tm->tm_hour >= 0) ? |
| 255 | bin2bcd(alm_tm->tm_hour) : HYM8563_ALM_BIT_DISABLE; |
| 256 | |
| 257 | buf[2] = (alm_tm->tm_mday <= 31 && alm_tm->tm_mday >= 1) ? |
| 258 | bin2bcd(alm_tm->tm_mday) : HYM8563_ALM_BIT_DISABLE; |
| 259 | |
| 260 | buf[3] = (alm_tm->tm_wday < 7 && alm_tm->tm_wday >= 0) ? |
| 261 | bin2bcd(alm_tm->tm_wday) : HYM8563_ALM_BIT_DISABLE; |
| 262 | |
| 263 | ret = i2c_smbus_write_i2c_block_data(client, HYM8563_ALM_MIN, 4, buf); |
| 264 | if (ret < 0) |
| 265 | return ret; |
| 266 | |
| 267 | return hym8563_rtc_alarm_irq_enable(dev, alm->enabled); |
| 268 | } |
| 269 | |
| 270 | static const struct rtc_class_ops hym8563_rtc_ops = { |
| 271 | .read_time = hym8563_rtc_read_time, |
| 272 | .set_time = hym8563_rtc_set_time, |
| 273 | .alarm_irq_enable = hym8563_rtc_alarm_irq_enable, |
| 274 | .read_alarm = hym8563_rtc_read_alarm, |
| 275 | .set_alarm = hym8563_rtc_set_alarm, |
| 276 | }; |
| 277 | |
| 278 | /* |
| 279 | * Handling of the clkout |
| 280 | */ |
| 281 | |
| 282 | #ifdef CONFIG_COMMON_CLK |
| 283 | #define clkout_hw_to_hym8563(_hw) container_of(_hw, struct hym8563, clkout_hw) |
| 284 | |
| 285 | static int clkout_rates[] = { |
| 286 | 32768, |
| 287 | 1024, |
| 288 | 32, |
| 289 | 1, |
| 290 | }; |
| 291 | |
| 292 | static unsigned long hym8563_clkout_recalc_rate(struct clk_hw *hw, |
| 293 | unsigned long parent_rate) |
| 294 | { |
| 295 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 296 | struct i2c_client *client = hym8563->client; |
| 297 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 298 | |
Heiko Stuebner | b3288a4 | 2015-04-16 12:45:34 -0700 | [diff] [blame] | 299 | if (ret < 0) |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 300 | return 0; |
| 301 | |
| 302 | ret &= HYM8563_CLKOUT_MASK; |
| 303 | return clkout_rates[ret]; |
| 304 | } |
| 305 | |
| 306 | static long hym8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, |
| 307 | unsigned long *prate) |
| 308 | { |
| 309 | int i; |
| 310 | |
| 311 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
| 312 | if (clkout_rates[i] <= rate) |
| 313 | return clkout_rates[i]; |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static int hym8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, |
| 319 | unsigned long parent_rate) |
| 320 | { |
| 321 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 322 | struct i2c_client *client = hym8563->client; |
| 323 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 324 | int i; |
| 325 | |
| 326 | if (ret < 0) |
| 327 | return ret; |
| 328 | |
| 329 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
| 330 | if (clkout_rates[i] == rate) { |
| 331 | ret &= ~HYM8563_CLKOUT_MASK; |
| 332 | ret |= i; |
| 333 | return i2c_smbus_write_byte_data(client, |
| 334 | HYM8563_CLKOUT, ret); |
| 335 | } |
| 336 | |
| 337 | return -EINVAL; |
| 338 | } |
| 339 | |
| 340 | static int hym8563_clkout_control(struct clk_hw *hw, bool enable) |
| 341 | { |
| 342 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 343 | struct i2c_client *client = hym8563->client; |
| 344 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 345 | |
| 346 | if (ret < 0) |
| 347 | return ret; |
| 348 | |
| 349 | if (enable) |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 350 | ret |= HYM8563_CLKOUT_ENABLE; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 351 | else |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 352 | ret &= ~HYM8563_CLKOUT_ENABLE; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 353 | |
| 354 | return i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, ret); |
| 355 | } |
| 356 | |
| 357 | static int hym8563_clkout_prepare(struct clk_hw *hw) |
| 358 | { |
| 359 | return hym8563_clkout_control(hw, 1); |
| 360 | } |
| 361 | |
| 362 | static void hym8563_clkout_unprepare(struct clk_hw *hw) |
| 363 | { |
| 364 | hym8563_clkout_control(hw, 0); |
| 365 | } |
| 366 | |
| 367 | static int hym8563_clkout_is_prepared(struct clk_hw *hw) |
| 368 | { |
| 369 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 370 | struct i2c_client *client = hym8563->client; |
| 371 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 372 | |
| 373 | if (ret < 0) |
| 374 | return ret; |
| 375 | |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 376 | return !!(ret & HYM8563_CLKOUT_ENABLE); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 377 | } |
| 378 | |
Sachin Kamat | 28ed893 | 2014-01-23 15:55:18 -0800 | [diff] [blame] | 379 | static const struct clk_ops hym8563_clkout_ops = { |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 380 | .prepare = hym8563_clkout_prepare, |
| 381 | .unprepare = hym8563_clkout_unprepare, |
| 382 | .is_prepared = hym8563_clkout_is_prepared, |
| 383 | .recalc_rate = hym8563_clkout_recalc_rate, |
| 384 | .round_rate = hym8563_clkout_round_rate, |
| 385 | .set_rate = hym8563_clkout_set_rate, |
| 386 | }; |
| 387 | |
| 388 | static struct clk *hym8563_clkout_register_clk(struct hym8563 *hym8563) |
| 389 | { |
| 390 | struct i2c_client *client = hym8563->client; |
| 391 | struct device_node *node = client->dev.of_node; |
| 392 | struct clk *clk; |
| 393 | struct clk_init_data init; |
| 394 | int ret; |
| 395 | |
| 396 | ret = i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 397 | 0); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 398 | if (ret < 0) |
| 399 | return ERR_PTR(ret); |
| 400 | |
| 401 | init.name = "hym8563-clkout"; |
| 402 | init.ops = &hym8563_clkout_ops; |
Stephen Boyd | bdcaace | 2016-04-19 18:13:58 -0700 | [diff] [blame] | 403 | init.flags = 0; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 404 | init.parent_names = NULL; |
| 405 | init.num_parents = 0; |
| 406 | hym8563->clkout_hw.init = &init; |
| 407 | |
Heiko Stuebner | 68164a7 | 2014-06-06 14:36:08 -0700 | [diff] [blame] | 408 | /* optional override of the clockname */ |
| 409 | of_property_read_string(node, "clock-output-names", &init.name); |
| 410 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 411 | /* register the clock */ |
| 412 | clk = clk_register(&client->dev, &hym8563->clkout_hw); |
| 413 | |
| 414 | if (!IS_ERR(clk)) |
| 415 | of_clk_add_provider(node, of_clk_src_simple_get, clk); |
| 416 | |
| 417 | return clk; |
| 418 | } |
| 419 | #endif |
| 420 | |
| 421 | /* |
| 422 | * The alarm interrupt is implemented as a level-low interrupt in the |
| 423 | * hym8563, while the timer interrupt uses a falling edge. |
| 424 | * We don't use the timer at all, so the interrupt is requested to |
| 425 | * use the level-low trigger. |
| 426 | */ |
| 427 | static irqreturn_t hym8563_irq(int irq, void *dev_id) |
| 428 | { |
| 429 | struct hym8563 *hym8563 = (struct hym8563 *)dev_id; |
| 430 | struct i2c_client *client = hym8563->client; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 431 | int data, ret; |
| 432 | |
Alexandre Belloni | 92e2c3e | 2021-01-19 23:06:45 +0100 | [diff] [blame] | 433 | rtc_lock(hym8563->rtc); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 434 | |
| 435 | /* Clear the alarm flag */ |
| 436 | |
| 437 | data = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 438 | if (data < 0) { |
| 439 | dev_err(&client->dev, "%s: error reading i2c data %d\n", |
| 440 | __func__, data); |
| 441 | goto out; |
| 442 | } |
| 443 | |
| 444 | data &= ~HYM8563_CTL2_AF; |
| 445 | |
| 446 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL2, data); |
| 447 | if (ret < 0) { |
| 448 | dev_err(&client->dev, "%s: error writing i2c data %d\n", |
| 449 | __func__, ret); |
| 450 | } |
| 451 | |
| 452 | out: |
Alexandre Belloni | 92e2c3e | 2021-01-19 23:06:45 +0100 | [diff] [blame] | 453 | rtc_unlock(hym8563->rtc); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 454 | return IRQ_HANDLED; |
| 455 | } |
| 456 | |
| 457 | static int hym8563_init_device(struct i2c_client *client) |
| 458 | { |
| 459 | int ret; |
| 460 | |
| 461 | /* Clear stop flag if present */ |
| 462 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, 0); |
| 463 | if (ret < 0) |
| 464 | return ret; |
| 465 | |
| 466 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 467 | if (ret < 0) |
| 468 | return ret; |
| 469 | |
| 470 | /* Disable alarm and timer interrupts */ |
| 471 | ret &= ~HYM8563_CTL2_AIE; |
| 472 | ret &= ~HYM8563_CTL2_TIE; |
| 473 | |
| 474 | /* Clear any pending alarm and timer flags */ |
| 475 | if (ret & HYM8563_CTL2_AF) |
| 476 | ret &= ~HYM8563_CTL2_AF; |
| 477 | |
| 478 | if (ret & HYM8563_CTL2_TF) |
| 479 | ret &= ~HYM8563_CTL2_TF; |
| 480 | |
| 481 | ret &= ~HYM8563_CTL2_TI_TP; |
| 482 | |
| 483 | return i2c_smbus_write_byte_data(client, HYM8563_CTL2, ret); |
| 484 | } |
| 485 | |
| 486 | #ifdef CONFIG_PM_SLEEP |
| 487 | static int hym8563_suspend(struct device *dev) |
| 488 | { |
| 489 | struct i2c_client *client = to_i2c_client(dev); |
| 490 | int ret; |
| 491 | |
| 492 | if (device_may_wakeup(dev)) { |
| 493 | ret = enable_irq_wake(client->irq); |
| 494 | if (ret) { |
| 495 | dev_err(dev, "enable_irq_wake failed, %d\n", ret); |
| 496 | return ret; |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static int hym8563_resume(struct device *dev) |
| 504 | { |
| 505 | struct i2c_client *client = to_i2c_client(dev); |
| 506 | |
| 507 | if (device_may_wakeup(dev)) |
| 508 | disable_irq_wake(client->irq); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | #endif |
| 513 | |
| 514 | static SIMPLE_DEV_PM_OPS(hym8563_pm_ops, hym8563_suspend, hym8563_resume); |
| 515 | |
| 516 | static int hym8563_probe(struct i2c_client *client, |
| 517 | const struct i2c_device_id *id) |
| 518 | { |
| 519 | struct hym8563 *hym8563; |
| 520 | int ret; |
| 521 | |
| 522 | hym8563 = devm_kzalloc(&client->dev, sizeof(*hym8563), GFP_KERNEL); |
| 523 | if (!hym8563) |
| 524 | return -ENOMEM; |
| 525 | |
| 526 | hym8563->client = client; |
| 527 | i2c_set_clientdata(client, hym8563); |
| 528 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 529 | ret = hym8563_init_device(client); |
| 530 | if (ret) { |
| 531 | dev_err(&client->dev, "could not init device, %d\n", ret); |
| 532 | return ret; |
| 533 | } |
| 534 | |
Heiko Stübner | 4be1f6b | 2015-06-13 12:34:04 +0200 | [diff] [blame] | 535 | if (client->irq > 0) { |
| 536 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
| 537 | NULL, hym8563_irq, |
| 538 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| 539 | client->name, hym8563); |
| 540 | if (ret < 0) { |
| 541 | dev_err(&client->dev, "irq %d request failed, %d\n", |
| 542 | client->irq, ret); |
| 543 | return ret; |
| 544 | } |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 545 | } |
| 546 | |
Guillaume Tucker | c56ac7a | 2020-11-06 09:06:31 +0000 | [diff] [blame] | 547 | if (client->irq > 0 || |
| 548 | device_property_read_bool(&client->dev, "wakeup-source")) { |
| 549 | device_init_wakeup(&client->dev, true); |
| 550 | } |
| 551 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 552 | /* check state of calendar information */ |
| 553 | ret = i2c_smbus_read_byte_data(client, HYM8563_SEC); |
| 554 | if (ret < 0) |
| 555 | return ret; |
| 556 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 557 | dev_dbg(&client->dev, "rtc information is %s\n", |
Paul Kocialkowski | e2ed750 | 2019-12-12 16:31:11 +0100 | [diff] [blame] | 558 | (ret & HYM8563_SEC_VL) ? "invalid" : "valid"); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 559 | |
| 560 | hym8563->rtc = devm_rtc_device_register(&client->dev, client->name, |
| 561 | &hym8563_rtc_ops, THIS_MODULE); |
| 562 | if (IS_ERR(hym8563->rtc)) |
| 563 | return PTR_ERR(hym8563->rtc); |
| 564 | |
Heiko Stuebner | 282cba6 | 2014-05-09 15:36:57 -0700 | [diff] [blame] | 565 | /* the hym8563 alarm only supports a minute accuracy */ |
| 566 | hym8563->rtc->uie_unsupported = 1; |
| 567 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 568 | #ifdef CONFIG_COMMON_CLK |
| 569 | hym8563_clkout_register_clk(hym8563); |
| 570 | #endif |
| 571 | |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | static const struct i2c_device_id hym8563_id[] = { |
| 576 | { "hym8563", 0 }, |
| 577 | {}, |
| 578 | }; |
| 579 | MODULE_DEVICE_TABLE(i2c, hym8563_id); |
| 580 | |
Jingoo Han | e524360 | 2014-06-06 14:35:55 -0700 | [diff] [blame] | 581 | static const struct of_device_id hym8563_dt_idtable[] = { |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 582 | { .compatible = "haoyu,hym8563" }, |
| 583 | {}, |
| 584 | }; |
| 585 | MODULE_DEVICE_TABLE(of, hym8563_dt_idtable); |
| 586 | |
| 587 | static struct i2c_driver hym8563_driver = { |
| 588 | .driver = { |
| 589 | .name = "rtc-hym8563", |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 590 | .pm = &hym8563_pm_ops, |
Sachin Kamat | 156e352 | 2014-01-23 15:55:17 -0800 | [diff] [blame] | 591 | .of_match_table = hym8563_dt_idtable, |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 592 | }, |
| 593 | .probe = hym8563_probe, |
| 594 | .id_table = hym8563_id, |
| 595 | }; |
| 596 | |
| 597 | module_i2c_driver(hym8563_driver); |
| 598 | |
| 599 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |
| 600 | MODULE_DESCRIPTION("HYM8563 RTC driver"); |
| 601 | MODULE_LICENSE("GPL"); |