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Commit d6c3029f authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Alexandre Belloni
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rtc: pcf2127: add support for accessing internal static RAM 



The PCF2127 has 512 bytes of internal static RAM and this patch expands
the driver to access this memory.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent cd7f3a24

drivers/rtc/rtc-pcf2127.c

+62 −6
Original line number Diff line number Diff line
@@ -36,6 +36,11 @@ 
#define PCF2127_REG_MO          (0x08)

#define PCF2127_REG_YR          (0x09)



/* the pcf2127 has 512 bytes nvmem, pcf2129 doesn't */

#define PCF2127_REG_RAM_addr_MSB       0x1a

#define PCF2127_REG_RAM_wrt_cmd        0x1c

#define PCF2127_REG_RAM_rd_cmd         0x1d



#define PCF2127_OSF             BIT(7)  /* Oscillator Fail flag */



struct pcf2127 {
@@ -183,10 +188,47 @@ static const struct rtc_class_ops pcf2127_rtc_ops = { 
	.set_time	= pcf2127_rtc_set_time,

};



static int pcf2127_nvmem_read(void *priv, unsigned int offset,

			      void *val, size_t bytes)

{

	struct pcf2127 *pcf2127 = priv;

	int ret;

	unsigned char offsetbuf[] = { offset >> 8, offset };



	ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_addr_MSB,

				offsetbuf, 2);

	if (ret)

		return ret;



	ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_rd_cmd,

			       val, bytes);



	return ret ?: bytes;

}



static int pcf2127_nvmem_write(void *priv, unsigned int offset,

			       void *val, size_t bytes)

{

	struct pcf2127 *pcf2127 = priv;

	int ret;

	unsigned char offsetbuf[] = { offset >> 8, offset };



	ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_addr_MSB,

				offsetbuf, 2);

	if (ret)

		return ret;



	ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_wrt_cmd,

				val, bytes);



	return ret ?: bytes;

}



static int pcf2127_probe(struct device *dev, struct regmap *regmap,

			const char *name)

			const char *name, bool has_nvmem)

{

	struct pcf2127 *pcf2127;

	int ret = 0;



	dev_dbg(dev, "%s\n", __func__);
@@ -200,8 +242,21 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap, 


	pcf2127->rtc = devm_rtc_device_register(dev, name, &pcf2127_rtc_ops,

						THIS_MODULE);

	if (IS_ERR(pcf2127->rtc))

		return PTR_ERR(pcf2127->rtc);



	if (has_nvmem) {

		struct nvmem_config nvmem_cfg = {

			.priv = pcf2127,

			.reg_read = pcf2127_nvmem_read,

			.reg_write = pcf2127_nvmem_write,

			.size = 512,

		};



	return PTR_ERR_OR_ZERO(pcf2127->rtc);

		ret = rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);

	}



	return ret;

}



#ifdef CONFIG_OF
@@ -309,11 +364,11 @@ static int pcf2127_i2c_probe(struct i2c_client *client, 
	}



	return pcf2127_probe(&client->dev, regmap,

				pcf2127_i2c_driver.driver.name);

			     pcf2127_i2c_driver.driver.name, id->driver_data);

}



static const struct i2c_device_id pcf2127_i2c_id[] = {

	{ "pcf2127", 0 },

	{ "pcf2127", 1 },

	{ "pcf2129", 0 },

	{ }

};
@@ -372,11 +427,12 @@ static int pcf2127_spi_probe(struct spi_device *spi) 
		return PTR_ERR(regmap);

	}



	return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name);

	return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name,

			     spi_get_device_id(spi)->driver_data);

}



static const struct spi_device_id pcf2127_spi_id[] = {

	{ "pcf2127", 0 },

	{ "pcf2127", 1 },

	{ "pcf2129", 0 },

	{ }

};