3  * Driver for ST M41T93 SPI RTC
17 #include <linux/spi/spi.h>
37 static inline int m41t93_set_reg(struct spi_device *spi, u8 addr, u8 data)  in m41t93_set_reg()  argument
45 	return spi_write(spi, buf, sizeof(buf));  in m41t93_set_reg()
50 	struct spi_device *spi = to_spi_device(dev);  in m41t93_set_time()  local
61 		dev_warn(&spi->dev, "unsupported date (before 2000-01-01).\n");  in m41t93_set_time()
75 	return spi_write(spi, buf, sizeof(buf));  in m41t93_set_time()
81 	struct spi_device *spi = to_spi_device(dev);  in m41t93_get_time()  local
97 	tmp = spi_w8r8(spi, M41T93_REG_ALM_HOUR_HT);  in m41t93_get_time()
102 		dev_dbg(&spi->dev, "HT bit is set, reenable clock update.\n");  in m41t93_get_time()
103 		m41t93_set_reg(spi, M41T93_REG_ALM_HOUR_HT,  in m41t93_get_time()
107 	tmp = spi_w8r8(spi, M41T93_REG_FLAGS);  in m41t93_get_time()
113 		dev_warn(&spi->dev, "OF bit is set, resetting.\n");  in m41t93_get_time()
114 		m41t93_set_reg(spi, M41T93_REG_FLAGS, tmp & ~M41T93_FLAG_OF);  in m41t93_get_time()
116 		tmp = spi_w8r8(spi, M41T93_REG_FLAGS);  in m41t93_get_time()
122 			dev_warn(&spi->dev,  in m41t93_get_time()
124 			m41t93_set_reg(spi, M41T93_REG_ST_SEC, reset_osc);  in m41t93_get_time()
126 			m41t93_set_reg(spi, M41T93_REG_ST_SEC, reset_osc);  in m41t93_get_time()
131 		dev_warn(&spi->dev, "BL bit is set, replace battery.\n");  in m41t93_get_time()
134 	tmp = spi_write_then_read(spi, &start_addr, 1, buf, sizeof(buf));  in m41t93_get_time()
165 static int __devinit m41t93_probe(struct spi_device *spi)  in m41t93_probe()  argument
170 	spi->bits_per_word = 8;  in m41t93_probe()
171 	spi_setup(spi);  in m41t93_probe()
173 	res = spi_w8r8(spi, M41T93_REG_WDAY);  in m41t93_probe()
175 		dev_err(&spi->dev, "not found 0x%x.\n", res);  in m41t93_probe()
180 		&spi->dev, &m41t93_rtc_ops, THIS_MODULE);  in m41t93_probe()
184 	dev_set_drvdata(&spi->dev, rtc);  in m41t93_probe()
190 static int __devexit m41t93_remove(struct spi_device *spi)  in m41t93_remove()  argument
192 	struct rtc_device *rtc = spi_get_drvdata(spi);  in m41t93_remove()
222 MODULE_DESCRIPTION("Driver for ST M41T93 SPI RTC");
224 MODULE_ALIAS("spi:rtc-m41t93");