Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Haoyu HYM8563 RTC driver |
| 3 | * |
| 4 | * Copyright (C) 2013 MundoReader S.L. |
| 5 | * Author: Heiko Stuebner <heiko@sntech.de> |
| 6 | * |
| 7 | * based on rtc-HYM8563 |
| 8 | * Copyright (C) 2010 ROCKCHIP, Inc. |
| 9 | * |
| 10 | * This software is licensed under the terms of the GNU General Public |
| 11 | * License version 2, as published by the Free Software Foundation, and |
| 12 | * may be copied, distributed, and modified under those terms. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/clk-provider.h> |
| 22 | #include <linux/i2c.h> |
| 23 | #include <linux/bcd.h> |
| 24 | #include <linux/rtc.h> |
| 25 | |
| 26 | #define HYM8563_CTL1 0x00 |
| 27 | #define HYM8563_CTL1_TEST BIT(7) |
| 28 | #define HYM8563_CTL1_STOP BIT(5) |
| 29 | #define HYM8563_CTL1_TESTC BIT(3) |
| 30 | |
| 31 | #define HYM8563_CTL2 0x01 |
| 32 | #define HYM8563_CTL2_TI_TP BIT(4) |
| 33 | #define HYM8563_CTL2_AF BIT(3) |
| 34 | #define HYM8563_CTL2_TF BIT(2) |
| 35 | #define HYM8563_CTL2_AIE BIT(1) |
| 36 | #define HYM8563_CTL2_TIE BIT(0) |
| 37 | |
| 38 | #define HYM8563_SEC 0x02 |
| 39 | #define HYM8563_SEC_VL BIT(7) |
| 40 | #define HYM8563_SEC_MASK 0x7f |
| 41 | |
| 42 | #define HYM8563_MIN 0x03 |
| 43 | #define HYM8563_MIN_MASK 0x7f |
| 44 | |
| 45 | #define HYM8563_HOUR 0x04 |
| 46 | #define HYM8563_HOUR_MASK 0x3f |
| 47 | |
| 48 | #define HYM8563_DAY 0x05 |
| 49 | #define HYM8563_DAY_MASK 0x3f |
| 50 | |
| 51 | #define HYM8563_WEEKDAY 0x06 |
| 52 | #define HYM8563_WEEKDAY_MASK 0x07 |
| 53 | |
| 54 | #define HYM8563_MONTH 0x07 |
| 55 | #define HYM8563_MONTH_CENTURY BIT(7) |
| 56 | #define HYM8563_MONTH_MASK 0x1f |
| 57 | |
| 58 | #define HYM8563_YEAR 0x08 |
| 59 | |
| 60 | #define HYM8563_ALM_MIN 0x09 |
| 61 | #define HYM8563_ALM_HOUR 0x0a |
| 62 | #define HYM8563_ALM_DAY 0x0b |
| 63 | #define HYM8563_ALM_WEEK 0x0c |
| 64 | |
| 65 | /* Each alarm check can be disabled by setting this bit in the register */ |
| 66 | #define HYM8563_ALM_BIT_DISABLE BIT(7) |
| 67 | |
| 68 | #define HYM8563_CLKOUT 0x0d |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 69 | #define HYM8563_CLKOUT_ENABLE BIT(7) |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 70 | #define HYM8563_CLKOUT_32768 0 |
| 71 | #define HYM8563_CLKOUT_1024 1 |
| 72 | #define HYM8563_CLKOUT_32 2 |
| 73 | #define HYM8563_CLKOUT_1 3 |
| 74 | #define HYM8563_CLKOUT_MASK 3 |
| 75 | |
| 76 | #define HYM8563_TMR_CTL 0x0e |
| 77 | #define HYM8563_TMR_CTL_ENABLE BIT(7) |
| 78 | #define HYM8563_TMR_CTL_4096 0 |
| 79 | #define HYM8563_TMR_CTL_64 1 |
| 80 | #define HYM8563_TMR_CTL_1 2 |
| 81 | #define HYM8563_TMR_CTL_1_60 3 |
| 82 | #define HYM8563_TMR_CTL_MASK 3 |
| 83 | |
| 84 | #define HYM8563_TMR_CNT 0x0f |
| 85 | |
| 86 | struct hym8563 { |
| 87 | struct i2c_client *client; |
| 88 | struct rtc_device *rtc; |
| 89 | bool valid; |
| 90 | #ifdef CONFIG_COMMON_CLK |
| 91 | struct clk_hw clkout_hw; |
| 92 | #endif |
| 93 | }; |
| 94 | |
| 95 | /* |
| 96 | * RTC handling |
| 97 | */ |
| 98 | |
| 99 | static int hym8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 100 | { |
| 101 | struct i2c_client *client = to_i2c_client(dev); |
| 102 | struct hym8563 *hym8563 = i2c_get_clientdata(client); |
| 103 | u8 buf[7]; |
| 104 | int ret; |
| 105 | |
| 106 | if (!hym8563->valid) { |
| 107 | dev_warn(&client->dev, "no valid clock/calendar values available\n"); |
| 108 | return -EPERM; |
| 109 | } |
| 110 | |
| 111 | ret = i2c_smbus_read_i2c_block_data(client, HYM8563_SEC, 7, buf); |
| 112 | |
| 113 | tm->tm_sec = bcd2bin(buf[0] & HYM8563_SEC_MASK); |
| 114 | tm->tm_min = bcd2bin(buf[1] & HYM8563_MIN_MASK); |
| 115 | tm->tm_hour = bcd2bin(buf[2] & HYM8563_HOUR_MASK); |
| 116 | tm->tm_mday = bcd2bin(buf[3] & HYM8563_DAY_MASK); |
| 117 | tm->tm_wday = bcd2bin(buf[4] & HYM8563_WEEKDAY_MASK); /* 0 = Sun */ |
| 118 | tm->tm_mon = bcd2bin(buf[5] & HYM8563_MONTH_MASK) - 1; /* 0 = Jan */ |
| 119 | tm->tm_year = bcd2bin(buf[6]) + 100; |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static int hym8563_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 125 | { |
| 126 | struct i2c_client *client = to_i2c_client(dev); |
| 127 | struct hym8563 *hym8563 = i2c_get_clientdata(client); |
| 128 | u8 buf[7]; |
| 129 | int ret; |
| 130 | |
| 131 | /* Years >= 2100 are to far in the future, 19XX is to early */ |
| 132 | if (tm->tm_year < 100 || tm->tm_year >= 200) |
| 133 | return -EINVAL; |
| 134 | |
| 135 | buf[0] = bin2bcd(tm->tm_sec); |
| 136 | buf[1] = bin2bcd(tm->tm_min); |
| 137 | buf[2] = bin2bcd(tm->tm_hour); |
| 138 | buf[3] = bin2bcd(tm->tm_mday); |
| 139 | buf[4] = bin2bcd(tm->tm_wday); |
| 140 | buf[5] = bin2bcd(tm->tm_mon + 1); |
| 141 | |
| 142 | /* |
| 143 | * While the HYM8563 has a century flag in the month register, |
| 144 | * it does not seem to carry it over a subsequent write/read. |
| 145 | * So we'll limit ourself to 100 years, starting at 2000 for now. |
| 146 | */ |
Alexander Kochetkov | d586126 | 2016-03-06 12:43:57 +0300 | [diff] [blame] | 147 | buf[6] = bin2bcd(tm->tm_year - 100); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 148 | |
| 149 | /* |
| 150 | * CTL1 only contains TEST-mode bits apart from stop, |
| 151 | * so no need to read the value first |
| 152 | */ |
| 153 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, |
| 154 | HYM8563_CTL1_STOP); |
| 155 | if (ret < 0) |
| 156 | return ret; |
| 157 | |
| 158 | ret = i2c_smbus_write_i2c_block_data(client, HYM8563_SEC, 7, buf); |
| 159 | if (ret < 0) |
| 160 | return ret; |
| 161 | |
| 162 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, 0); |
| 163 | if (ret < 0) |
| 164 | return ret; |
| 165 | |
| 166 | hym8563->valid = true; |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int hym8563_rtc_alarm_irq_enable(struct device *dev, |
| 172 | unsigned int enabled) |
| 173 | { |
| 174 | struct i2c_client *client = to_i2c_client(dev); |
| 175 | int data; |
| 176 | |
| 177 | data = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 178 | if (data < 0) |
| 179 | return data; |
| 180 | |
| 181 | if (enabled) |
| 182 | data |= HYM8563_CTL2_AIE; |
| 183 | else |
| 184 | data &= ~HYM8563_CTL2_AIE; |
| 185 | |
| 186 | return i2c_smbus_write_byte_data(client, HYM8563_CTL2, data); |
| 187 | }; |
| 188 | |
| 189 | static int hym8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 190 | { |
| 191 | struct i2c_client *client = to_i2c_client(dev); |
| 192 | struct rtc_time *alm_tm = &alm->time; |
| 193 | u8 buf[4]; |
| 194 | int ret; |
| 195 | |
| 196 | ret = i2c_smbus_read_i2c_block_data(client, HYM8563_ALM_MIN, 4, buf); |
| 197 | if (ret < 0) |
| 198 | return ret; |
| 199 | |
| 200 | /* The alarm only has a minute accuracy */ |
| 201 | alm_tm->tm_sec = -1; |
| 202 | |
| 203 | alm_tm->tm_min = (buf[0] & HYM8563_ALM_BIT_DISABLE) ? |
| 204 | -1 : |
| 205 | bcd2bin(buf[0] & HYM8563_MIN_MASK); |
| 206 | alm_tm->tm_hour = (buf[1] & HYM8563_ALM_BIT_DISABLE) ? |
| 207 | -1 : |
| 208 | bcd2bin(buf[1] & HYM8563_HOUR_MASK); |
| 209 | alm_tm->tm_mday = (buf[2] & HYM8563_ALM_BIT_DISABLE) ? |
| 210 | -1 : |
| 211 | bcd2bin(buf[2] & HYM8563_DAY_MASK); |
| 212 | alm_tm->tm_wday = (buf[3] & HYM8563_ALM_BIT_DISABLE) ? |
| 213 | -1 : |
| 214 | bcd2bin(buf[3] & HYM8563_WEEKDAY_MASK); |
| 215 | |
| 216 | alm_tm->tm_mon = -1; |
| 217 | alm_tm->tm_year = -1; |
| 218 | |
| 219 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 220 | if (ret < 0) |
| 221 | return ret; |
| 222 | |
| 223 | if (ret & HYM8563_CTL2_AIE) |
| 224 | alm->enabled = 1; |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static int hym8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 230 | { |
| 231 | struct i2c_client *client = to_i2c_client(dev); |
| 232 | struct rtc_time *alm_tm = &alm->time; |
| 233 | u8 buf[4]; |
| 234 | int ret; |
| 235 | |
| 236 | /* |
| 237 | * The alarm has no seconds so deal with it |
| 238 | */ |
| 239 | if (alm_tm->tm_sec) { |
| 240 | alm_tm->tm_sec = 0; |
| 241 | alm_tm->tm_min++; |
| 242 | if (alm_tm->tm_min >= 60) { |
| 243 | alm_tm->tm_min = 0; |
| 244 | alm_tm->tm_hour++; |
| 245 | if (alm_tm->tm_hour >= 24) { |
| 246 | alm_tm->tm_hour = 0; |
| 247 | alm_tm->tm_mday++; |
| 248 | if (alm_tm->tm_mday > 31) |
| 249 | alm_tm->tm_mday = 0; |
| 250 | } |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 255 | if (ret < 0) |
| 256 | return ret; |
| 257 | |
| 258 | ret &= ~HYM8563_CTL2_AIE; |
| 259 | |
| 260 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL2, ret); |
| 261 | if (ret < 0) |
| 262 | return ret; |
| 263 | |
| 264 | buf[0] = (alm_tm->tm_min < 60 && alm_tm->tm_min >= 0) ? |
| 265 | bin2bcd(alm_tm->tm_min) : HYM8563_ALM_BIT_DISABLE; |
| 266 | |
| 267 | buf[1] = (alm_tm->tm_hour < 24 && alm_tm->tm_hour >= 0) ? |
| 268 | bin2bcd(alm_tm->tm_hour) : HYM8563_ALM_BIT_DISABLE; |
| 269 | |
| 270 | buf[2] = (alm_tm->tm_mday <= 31 && alm_tm->tm_mday >= 1) ? |
| 271 | bin2bcd(alm_tm->tm_mday) : HYM8563_ALM_BIT_DISABLE; |
| 272 | |
| 273 | buf[3] = (alm_tm->tm_wday < 7 && alm_tm->tm_wday >= 0) ? |
| 274 | bin2bcd(alm_tm->tm_wday) : HYM8563_ALM_BIT_DISABLE; |
| 275 | |
| 276 | ret = i2c_smbus_write_i2c_block_data(client, HYM8563_ALM_MIN, 4, buf); |
| 277 | if (ret < 0) |
| 278 | return ret; |
| 279 | |
| 280 | return hym8563_rtc_alarm_irq_enable(dev, alm->enabled); |
| 281 | } |
| 282 | |
| 283 | static const struct rtc_class_ops hym8563_rtc_ops = { |
| 284 | .read_time = hym8563_rtc_read_time, |
| 285 | .set_time = hym8563_rtc_set_time, |
| 286 | .alarm_irq_enable = hym8563_rtc_alarm_irq_enable, |
| 287 | .read_alarm = hym8563_rtc_read_alarm, |
| 288 | .set_alarm = hym8563_rtc_set_alarm, |
| 289 | }; |
| 290 | |
| 291 | /* |
| 292 | * Handling of the clkout |
| 293 | */ |
| 294 | |
| 295 | #ifdef CONFIG_COMMON_CLK |
| 296 | #define clkout_hw_to_hym8563(_hw) container_of(_hw, struct hym8563, clkout_hw) |
| 297 | |
| 298 | static int clkout_rates[] = { |
| 299 | 32768, |
| 300 | 1024, |
| 301 | 32, |
| 302 | 1, |
| 303 | }; |
| 304 | |
| 305 | static unsigned long hym8563_clkout_recalc_rate(struct clk_hw *hw, |
| 306 | unsigned long parent_rate) |
| 307 | { |
| 308 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 309 | struct i2c_client *client = hym8563->client; |
| 310 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 311 | |
Heiko Stuebner | b3288a4 | 2015-04-16 12:45:34 -0700 | [diff] [blame] | 312 | if (ret < 0) |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 313 | return 0; |
| 314 | |
| 315 | ret &= HYM8563_CLKOUT_MASK; |
| 316 | return clkout_rates[ret]; |
| 317 | } |
| 318 | |
| 319 | static long hym8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, |
| 320 | unsigned long *prate) |
| 321 | { |
| 322 | int i; |
| 323 | |
| 324 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
| 325 | if (clkout_rates[i] <= rate) |
| 326 | return clkout_rates[i]; |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static int hym8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, |
| 332 | unsigned long parent_rate) |
| 333 | { |
| 334 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 335 | struct i2c_client *client = hym8563->client; |
| 336 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 337 | int i; |
| 338 | |
| 339 | if (ret < 0) |
| 340 | return ret; |
| 341 | |
| 342 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) |
| 343 | if (clkout_rates[i] == rate) { |
| 344 | ret &= ~HYM8563_CLKOUT_MASK; |
| 345 | ret |= i; |
| 346 | return i2c_smbus_write_byte_data(client, |
| 347 | HYM8563_CLKOUT, ret); |
| 348 | } |
| 349 | |
| 350 | return -EINVAL; |
| 351 | } |
| 352 | |
| 353 | static int hym8563_clkout_control(struct clk_hw *hw, bool enable) |
| 354 | { |
| 355 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 356 | struct i2c_client *client = hym8563->client; |
| 357 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 358 | |
| 359 | if (ret < 0) |
| 360 | return ret; |
| 361 | |
| 362 | if (enable) |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 363 | ret |= HYM8563_CLKOUT_ENABLE; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 364 | else |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 365 | ret &= ~HYM8563_CLKOUT_ENABLE; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 366 | |
| 367 | return i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, ret); |
| 368 | } |
| 369 | |
| 370 | static int hym8563_clkout_prepare(struct clk_hw *hw) |
| 371 | { |
| 372 | return hym8563_clkout_control(hw, 1); |
| 373 | } |
| 374 | |
| 375 | static void hym8563_clkout_unprepare(struct clk_hw *hw) |
| 376 | { |
| 377 | hym8563_clkout_control(hw, 0); |
| 378 | } |
| 379 | |
| 380 | static int hym8563_clkout_is_prepared(struct clk_hw *hw) |
| 381 | { |
| 382 | struct hym8563 *hym8563 = clkout_hw_to_hym8563(hw); |
| 383 | struct i2c_client *client = hym8563->client; |
| 384 | int ret = i2c_smbus_read_byte_data(client, HYM8563_CLKOUT); |
| 385 | |
| 386 | if (ret < 0) |
| 387 | return ret; |
| 388 | |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 389 | return !!(ret & HYM8563_CLKOUT_ENABLE); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 390 | } |
| 391 | |
Sachin Kamat | 28ed893 | 2014-01-23 15:55:18 -0800 | [diff] [blame] | 392 | static const struct clk_ops hym8563_clkout_ops = { |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 393 | .prepare = hym8563_clkout_prepare, |
| 394 | .unprepare = hym8563_clkout_unprepare, |
| 395 | .is_prepared = hym8563_clkout_is_prepared, |
| 396 | .recalc_rate = hym8563_clkout_recalc_rate, |
| 397 | .round_rate = hym8563_clkout_round_rate, |
| 398 | .set_rate = hym8563_clkout_set_rate, |
| 399 | }; |
| 400 | |
| 401 | static struct clk *hym8563_clkout_register_clk(struct hym8563 *hym8563) |
| 402 | { |
| 403 | struct i2c_client *client = hym8563->client; |
| 404 | struct device_node *node = client->dev.of_node; |
| 405 | struct clk *clk; |
| 406 | struct clk_init_data init; |
| 407 | int ret; |
| 408 | |
| 409 | ret = i2c_smbus_write_byte_data(client, HYM8563_CLKOUT, |
Heiko Stübner | f539a8ac | 2015-04-16 12:46:11 -0700 | [diff] [blame] | 410 | 0); |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 411 | if (ret < 0) |
| 412 | return ERR_PTR(ret); |
| 413 | |
| 414 | init.name = "hym8563-clkout"; |
| 415 | init.ops = &hym8563_clkout_ops; |
Stephen Boyd | bdcaace | 2016-04-19 18:13:58 -0700 | [diff] [blame] | 416 | init.flags = 0; |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 417 | init.parent_names = NULL; |
| 418 | init.num_parents = 0; |
| 419 | hym8563->clkout_hw.init = &init; |
| 420 | |
Heiko Stuebner | 68164a7 | 2014-06-06 14:36:08 -0700 | [diff] [blame] | 421 | /* optional override of the clockname */ |
| 422 | of_property_read_string(node, "clock-output-names", &init.name); |
| 423 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 424 | /* register the clock */ |
| 425 | clk = clk_register(&client->dev, &hym8563->clkout_hw); |
| 426 | |
| 427 | if (!IS_ERR(clk)) |
| 428 | of_clk_add_provider(node, of_clk_src_simple_get, clk); |
| 429 | |
| 430 | return clk; |
| 431 | } |
| 432 | #endif |
| 433 | |
| 434 | /* |
| 435 | * The alarm interrupt is implemented as a level-low interrupt in the |
| 436 | * hym8563, while the timer interrupt uses a falling edge. |
| 437 | * We don't use the timer at all, so the interrupt is requested to |
| 438 | * use the level-low trigger. |
| 439 | */ |
| 440 | static irqreturn_t hym8563_irq(int irq, void *dev_id) |
| 441 | { |
| 442 | struct hym8563 *hym8563 = (struct hym8563 *)dev_id; |
| 443 | struct i2c_client *client = hym8563->client; |
| 444 | struct mutex *lock = &hym8563->rtc->ops_lock; |
| 445 | int data, ret; |
| 446 | |
| 447 | mutex_lock(lock); |
| 448 | |
| 449 | /* Clear the alarm flag */ |
| 450 | |
| 451 | data = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 452 | if (data < 0) { |
| 453 | dev_err(&client->dev, "%s: error reading i2c data %d\n", |
| 454 | __func__, data); |
| 455 | goto out; |
| 456 | } |
| 457 | |
| 458 | data &= ~HYM8563_CTL2_AF; |
| 459 | |
| 460 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL2, data); |
| 461 | if (ret < 0) { |
| 462 | dev_err(&client->dev, "%s: error writing i2c data %d\n", |
| 463 | __func__, ret); |
| 464 | } |
| 465 | |
| 466 | out: |
| 467 | mutex_unlock(lock); |
| 468 | return IRQ_HANDLED; |
| 469 | } |
| 470 | |
| 471 | static int hym8563_init_device(struct i2c_client *client) |
| 472 | { |
| 473 | int ret; |
| 474 | |
| 475 | /* Clear stop flag if present */ |
| 476 | ret = i2c_smbus_write_byte_data(client, HYM8563_CTL1, 0); |
| 477 | if (ret < 0) |
| 478 | return ret; |
| 479 | |
| 480 | ret = i2c_smbus_read_byte_data(client, HYM8563_CTL2); |
| 481 | if (ret < 0) |
| 482 | return ret; |
| 483 | |
| 484 | /* Disable alarm and timer interrupts */ |
| 485 | ret &= ~HYM8563_CTL2_AIE; |
| 486 | ret &= ~HYM8563_CTL2_TIE; |
| 487 | |
| 488 | /* Clear any pending alarm and timer flags */ |
| 489 | if (ret & HYM8563_CTL2_AF) |
| 490 | ret &= ~HYM8563_CTL2_AF; |
| 491 | |
| 492 | if (ret & HYM8563_CTL2_TF) |
| 493 | ret &= ~HYM8563_CTL2_TF; |
| 494 | |
| 495 | ret &= ~HYM8563_CTL2_TI_TP; |
| 496 | |
| 497 | return i2c_smbus_write_byte_data(client, HYM8563_CTL2, ret); |
| 498 | } |
| 499 | |
| 500 | #ifdef CONFIG_PM_SLEEP |
| 501 | static int hym8563_suspend(struct device *dev) |
| 502 | { |
| 503 | struct i2c_client *client = to_i2c_client(dev); |
| 504 | int ret; |
| 505 | |
| 506 | if (device_may_wakeup(dev)) { |
| 507 | ret = enable_irq_wake(client->irq); |
| 508 | if (ret) { |
| 509 | dev_err(dev, "enable_irq_wake failed, %d\n", ret); |
| 510 | return ret; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static int hym8563_resume(struct device *dev) |
| 518 | { |
| 519 | struct i2c_client *client = to_i2c_client(dev); |
| 520 | |
| 521 | if (device_may_wakeup(dev)) |
| 522 | disable_irq_wake(client->irq); |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | #endif |
| 527 | |
| 528 | static SIMPLE_DEV_PM_OPS(hym8563_pm_ops, hym8563_suspend, hym8563_resume); |
| 529 | |
| 530 | static int hym8563_probe(struct i2c_client *client, |
| 531 | const struct i2c_device_id *id) |
| 532 | { |
| 533 | struct hym8563 *hym8563; |
| 534 | int ret; |
| 535 | |
| 536 | hym8563 = devm_kzalloc(&client->dev, sizeof(*hym8563), GFP_KERNEL); |
| 537 | if (!hym8563) |
| 538 | return -ENOMEM; |
| 539 | |
| 540 | hym8563->client = client; |
| 541 | i2c_set_clientdata(client, hym8563); |
| 542 | |
| 543 | device_set_wakeup_capable(&client->dev, true); |
| 544 | |
| 545 | ret = hym8563_init_device(client); |
| 546 | if (ret) { |
| 547 | dev_err(&client->dev, "could not init device, %d\n", ret); |
| 548 | return ret; |
| 549 | } |
| 550 | |
Heiko Stübner | 4be1f6b | 2015-06-13 12:34:04 +0200 | [diff] [blame] | 551 | if (client->irq > 0) { |
| 552 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
| 553 | NULL, hym8563_irq, |
| 554 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| 555 | client->name, hym8563); |
| 556 | if (ret < 0) { |
| 557 | dev_err(&client->dev, "irq %d request failed, %d\n", |
| 558 | client->irq, ret); |
| 559 | return ret; |
| 560 | } |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 561 | } |
| 562 | |
| 563 | /* check state of calendar information */ |
| 564 | ret = i2c_smbus_read_byte_data(client, HYM8563_SEC); |
| 565 | if (ret < 0) |
| 566 | return ret; |
| 567 | |
| 568 | hym8563->valid = !(ret & HYM8563_SEC_VL); |
| 569 | dev_dbg(&client->dev, "rtc information is %s\n", |
| 570 | hym8563->valid ? "valid" : "invalid"); |
| 571 | |
| 572 | hym8563->rtc = devm_rtc_device_register(&client->dev, client->name, |
| 573 | &hym8563_rtc_ops, THIS_MODULE); |
| 574 | if (IS_ERR(hym8563->rtc)) |
| 575 | return PTR_ERR(hym8563->rtc); |
| 576 | |
Heiko Stuebner | 282cba6 | 2014-05-09 15:36:57 -0700 | [diff] [blame] | 577 | /* the hym8563 alarm only supports a minute accuracy */ |
| 578 | hym8563->rtc->uie_unsupported = 1; |
| 579 | |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 580 | #ifdef CONFIG_COMMON_CLK |
| 581 | hym8563_clkout_register_clk(hym8563); |
| 582 | #endif |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | static const struct i2c_device_id hym8563_id[] = { |
| 588 | { "hym8563", 0 }, |
| 589 | {}, |
| 590 | }; |
| 591 | MODULE_DEVICE_TABLE(i2c, hym8563_id); |
| 592 | |
Jingoo Han | e524360 | 2014-06-06 14:35:55 -0700 | [diff] [blame] | 593 | static const struct of_device_id hym8563_dt_idtable[] = { |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 594 | { .compatible = "haoyu,hym8563" }, |
| 595 | {}, |
| 596 | }; |
| 597 | MODULE_DEVICE_TABLE(of, hym8563_dt_idtable); |
| 598 | |
| 599 | static struct i2c_driver hym8563_driver = { |
| 600 | .driver = { |
| 601 | .name = "rtc-hym8563", |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 602 | .pm = &hym8563_pm_ops, |
Sachin Kamat | 156e352 | 2014-01-23 15:55:17 -0800 | [diff] [blame] | 603 | .of_match_table = hym8563_dt_idtable, |
Heiko Stuebner | dcaf038 | 2014-01-23 15:55:10 -0800 | [diff] [blame] | 604 | }, |
| 605 | .probe = hym8563_probe, |
| 606 | .id_table = hym8563_id, |
| 607 | }; |
| 608 | |
| 609 | module_i2c_driver(hym8563_driver); |
| 610 | |
| 611 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |
| 612 | MODULE_DESCRIPTION("HYM8563 RTC driver"); |
| 613 | MODULE_LICENSE("GPL"); |