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mfd: Convert wm8350 physical I/O to regmap API
The driver still uses a custom cache implementation but the underlying physical I/O is now done using the regmap API, saving some code and avoiding allocating enormous scratch arrays on the stack. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown
Samuel Ortiz
parent
ce7e4e1122
commit
b7b142d9fc
@ -20,6 +20,7 @@
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/wm8350/core.h>
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@ -74,7 +75,7 @@ static int wm8350_phys_read(struct wm8350 *wm8350, u8 reg, int num_regs,
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int bytes = num_regs * 2;
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dev_dbg(wm8350->dev, "volatile read\n");
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ret = wm8350->read_dev(wm8350, reg, bytes, (char *)dest);
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ret = regmap_raw_read(wm8350->regmap, reg, dest, bytes);
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for (i = reg; i < reg + num_regs; i++) {
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/* Cache is CPU endian */
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@ -96,9 +97,6 @@ static int wm8350_read(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *dest)
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int ret = 0;
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int bytes = num_regs * 2;
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if (wm8350->read_dev == NULL)
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return -ENODEV;
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if ((reg + num_regs - 1) > WM8350_MAX_REGISTER) {
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dev_err(wm8350->dev, "invalid reg %x\n",
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reg + num_regs - 1);
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@ -149,9 +147,6 @@ static int wm8350_write(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *src)
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int end = reg + num_regs;
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int bytes = num_regs * 2;
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if (wm8350->write_dev == NULL)
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return -ENODEV;
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if ((reg + num_regs - 1) > WM8350_MAX_REGISTER) {
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dev_err(wm8350->dev, "invalid reg %x\n",
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reg + num_regs - 1);
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@ -182,7 +177,7 @@ static int wm8350_write(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *src)
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}
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/* Actually write it out */
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return wm8350->write_dev(wm8350, reg, bytes, (char *)src);
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return regmap_raw_write(wm8350->regmap, reg, src, bytes);
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}
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/*
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@ -515,9 +510,8 @@ static int wm8350_create_cache(struct wm8350 *wm8350, int type, int mode)
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* a PMIC so the device many not be in a virgin state and we
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* can't rely on the silicon values.
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*/
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ret = wm8350->read_dev(wm8350, 0,
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sizeof(u16) * (WM8350_MAX_REGISTER + 1),
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wm8350->reg_cache);
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ret = regmap_raw_read(wm8350->regmap, 0, wm8350->reg_cache,
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sizeof(u16) * (WM8350_MAX_REGISTER + 1));
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if (ret < 0) {
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dev_err(wm8350->dev,
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"failed to read initial cache values\n");
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@ -570,35 +564,30 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
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struct wm8350_platform_data *pdata)
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{
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int ret;
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u16 id1, id2, mask_rev;
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u16 cust_id, mode, chip_rev;
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unsigned int id1, id2, mask_rev;
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unsigned int cust_id, mode, chip_rev;
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dev_set_drvdata(wm8350->dev, wm8350);
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/* get WM8350 revision and config mode */
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ret = wm8350->read_dev(wm8350, WM8350_RESET_ID, sizeof(id1), &id1);
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ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
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if (ret != 0) {
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dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
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goto err;
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}
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ret = wm8350->read_dev(wm8350, WM8350_ID, sizeof(id2), &id2);
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ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
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if (ret != 0) {
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dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
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goto err;
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}
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ret = wm8350->read_dev(wm8350, WM8350_REVISION, sizeof(mask_rev),
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&mask_rev);
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ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
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if (ret != 0) {
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dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
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goto err;
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}
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id1 = be16_to_cpu(id1);
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id2 = be16_to_cpu(id2);
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mask_rev = be16_to_cpu(mask_rev);
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if (id1 != 0x6143) {
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dev_err(wm8350->dev,
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"Device with ID %x is not a WM8350\n", id1);
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@ -15,47 +15,18 @@
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
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int bytes, void *dest)
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{
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int ret;
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ret = i2c_master_send(wm8350->i2c_client, ®, 1);
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if (ret < 0)
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return ret;
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ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
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if (ret < 0)
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return ret;
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if (ret != bytes)
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return -EIO;
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return 0;
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}
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static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
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int bytes, void *src)
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{
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/* we add 1 byte for device register */
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u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
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int ret;
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if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
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return -EINVAL;
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msg[0] = reg;
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memcpy(&msg[1], src, bytes);
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ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
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if (ret < 0)
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return ret;
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if (ret != bytes + 1)
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return -EIO;
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return 0;
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}
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static const struct regmap_config wm8350_regmap = {
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.reg_bits = 8,
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.val_bits = 16,
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};
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static int wm8350_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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@ -67,11 +38,16 @@ static int wm8350_i2c_probe(struct i2c_client *i2c,
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if (wm8350 == NULL)
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return -ENOMEM;
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wm8350->regmap = devm_regmap_init_i2c(i2c, &wm8350_regmap);
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if (IS_ERR(wm8350->regmap)) {
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ret = PTR_ERR(wm8350->regmap);
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dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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i2c_set_clientdata(i2c, wm8350);
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wm8350->dev = &i2c->dev;
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wm8350->i2c_client = i2c;
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wm8350->read_dev = wm8350_i2c_read_device;
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wm8350->write_dev = wm8350_i2c_write_device;
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ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
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if (ret < 0)
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@ -80,6 +56,7 @@ static int wm8350_i2c_probe(struct i2c_client *i2c,
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return ret;
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err:
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regmap_exit(wm8350->regmap);
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return ret;
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}
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@ -602,6 +602,7 @@ extern const u16 wm8352_mode2_defaults[];
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extern const u16 wm8352_mode3_defaults[];
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struct wm8350;
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struct regmap;
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struct wm8350_hwmon {
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struct platform_device *pdev;
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@ -612,13 +613,7 @@ struct wm8350 {
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struct device *dev;
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/* device IO */
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union {
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struct i2c_client *i2c_client;
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struct spi_device *spi_device;
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};
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int (*read_dev)(struct wm8350 *wm8350, char reg, int size, void *dest);
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int (*write_dev)(struct wm8350 *wm8350, char reg, int size,
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void *src);
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struct regmap *regmap;
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u16 *reg_cache;
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struct mutex auxadc_mutex;
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