Lines Matching +full:spi +full:- +full:device
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* rtc-max6916.c
4 * Driver for MAXIM max6916 Low Current, SPI Compatible
12 #include <linux/device.h>
15 #include <linux/spi/spi.h>
31 static int max6916_read_reg(struct device *dev, unsigned char address, in max6916_read_reg()
34 struct spi_device *spi = to_spi_device(dev); in max6916_read_reg() local
38 return spi_write_then_read(spi, data, 1, data, 1); in max6916_read_reg()
41 static int max6916_write_reg(struct device *dev, unsigned char address, in max6916_write_reg()
44 struct spi_device *spi = to_spi_device(dev); in max6916_write_reg() local
50 return spi_write_then_read(spi, buf, 2, NULL, 0); in max6916_write_reg()
53 static int max6916_read_time(struct device *dev, struct rtc_time *dt) in max6916_read_time()
55 struct spi_device *spi = to_spi_device(dev); in max6916_read_time() local
61 err = spi_write_then_read(spi, buf, 1, buf, 8); in max6916_read_time()
66 dt->tm_sec = bcd2bin(buf[0]); in max6916_read_time()
67 dt->tm_min = bcd2bin(buf[1]); in max6916_read_time()
68 dt->tm_hour = bcd2bin(buf[2] & 0x3F); in max6916_read_time()
69 dt->tm_mday = bcd2bin(buf[3]); in max6916_read_time()
70 dt->tm_mon = bcd2bin(buf[4]) - 1; in max6916_read_time()
71 dt->tm_wday = bcd2bin(buf[5]) - 1; in max6916_read_time()
72 dt->tm_year = bcd2bin(buf[6]) + 100; in max6916_read_time()
77 static int max6916_set_time(struct device *dev, struct rtc_time *dt) in max6916_set_time()
79 struct spi_device *spi = to_spi_device(dev); in max6916_set_time() local
82 if (dt->tm_year < 100 || dt->tm_year > 199) { in max6916_set_time()
83 dev_err(&spi->dev, "Year must be between 2000 and 2099. It's %d.\n", in max6916_set_time()
84 dt->tm_year + 1900); in max6916_set_time()
85 return -EINVAL; in max6916_set_time()
89 buf[1] = bin2bcd(dt->tm_sec); in max6916_set_time()
90 buf[2] = bin2bcd(dt->tm_min); in max6916_set_time()
91 buf[3] = (bin2bcd(dt->tm_hour) & 0X3F); in max6916_set_time()
92 buf[4] = bin2bcd(dt->tm_mday); in max6916_set_time()
93 buf[5] = bin2bcd(dt->tm_mon + 1); in max6916_set_time()
94 buf[6] = bin2bcd(dt->tm_wday + 1); in max6916_set_time()
95 buf[7] = bin2bcd(dt->tm_year % 100); in max6916_set_time()
99 return spi_write_then_read(spi, buf, 9, NULL, 0); in max6916_set_time()
107 static int max6916_probe(struct spi_device *spi) in max6916_probe() argument
113 /* spi setup with max6916 in mode 3 and bits per word as 8 */ in max6916_probe()
114 spi->mode = SPI_MODE_3; in max6916_probe()
115 spi->bits_per_word = 8; in max6916_probe()
116 spi_setup(spi); in max6916_probe()
119 res = max6916_read_reg(&spi->dev, MAX6916_SECONDS_REG, &data); in max6916_probe()
124 max6916_read_reg(&spi->dev, MAX6916_CONTROL_REG, &data); in max6916_probe()
126 max6916_write_reg(&spi->dev, MAX6916_CONTROL_REG, data); in max6916_probe()
129 max6916_read_reg(&spi->dev, MAX6916_STATUS_REG, &data); in max6916_probe()
131 max6916_write_reg(&spi->dev, MAX6916_STATUS_REG, data); in max6916_probe()
134 max6916_read_reg(&spi->dev, MAX6916_CONTROL_REG, &data); in max6916_probe()
135 dev_info(&spi->dev, "MAX6916 RTC CTRL Reg = 0x%02x\n", data); in max6916_probe()
137 max6916_read_reg(&spi->dev, MAX6916_STATUS_REG, &data); in max6916_probe()
138 dev_info(&spi->dev, "MAX6916 RTC Status Reg = 0x%02x\n", data); in max6916_probe()
140 rtc = devm_rtc_device_register(&spi->dev, "max6916", in max6916_probe()
145 spi_set_drvdata(spi, rtc); in max6916_probe()
158 MODULE_DESCRIPTION("MAX6916 SPI RTC DRIVER");