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Message-ID: <20090807202456.GC9780@nokia.com>
Date: Fri, 7 Aug 2009 23:24:56 +0300
From: Felipe Balbi <felipe.balbi@...ia.com>
To: ext Anuj Aggarwal <anuj.aggarwal@...com>
Cc: "broonie@...ena.org.uk" <broonie@...ena.org.uk>,
"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/8] Regulator: Add TPS65023 regulator driver
Hi,
Adding linux-i2c to the loop.
On Fri, Aug 07, 2009 at 05:25:26PM +0200, ext Anuj Aggarwal wrote:
> +static inline int tps_65023_read_reg(struct tps_pmic *tps, u8 reg, u8 *val)
> +{
> + int status;
> +
> + status = i2c_smbus_read_byte_data(tps->client, reg);
> + *val = status;
> + if (status < 0)
> + return status;
> + return 0;
> +}
make this:
static inline int tps_65023_read_reg(struct tps_pmic *tps, u8 reg)
{
return i2c_smbus_read_byte_data(tps->client, reg);
}
ad change the users likewise.
> +static inline int tps_65023_write_reg(struct tps_pmic *tps, u8 reg, u8 val)
> +{
> + return i2c_smbus_write_byte_data(tps->client, reg, val);
> +}
> +
> +static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
> +{
> + u8 data;
> + int err;
> +
> + err = tps_65023_read_reg(tps, reg, &data);
then this would become:
data = tps_65023_read_reg(tps, reg);
if (data < 0) {
> + if (err) {
> + pr_err("Read from reg 0x%x failed\n", reg);
this should use dev_dbg(); you have a device struct inside the
i2c_client, use it.
> + return err;
> + }
> +
> + data |= mask;
> +
> + return tps_65023_write_reg(tps, reg, data);
> +}
> +
> +static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
> +{
> + u8 data;
> + int err;
> +
> + err = tps_65023_read_reg(tps, reg, &data);
> + if (err) {
ditto
> + pr_err("Read from reg 0x%x failed\n", reg);
ditto
> + return err;
> + }
> +
> + data &= ~mask;
> +
> + return tps_65023_write_reg(tps, reg, data);
> +}
> +
> +static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
> +{
> + unsigned char reg_ctrl;
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int dcdc = rdev_get_id(dev);
> + int ret;
> + u8 shift;
> +
> + if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
> + return -EINVAL;
> +
> + shift = TPS65023_NUM_REGULATOR - dcdc;
> + ret = tps_65023_read_reg(tps, TPS65023_REG_REG_CTRL, ®_ctrl);
> +
> + if (ret == 0) {
> + reg_ctrl &= (1 << shift);
> + return reg_ctrl ? 1 : 0;
> + } else
> + return ret;
> +}
> +
> +static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int ldo = rdev_get_id(dev);
> + int ret;
> + u8 shift;
> + unsigned char reg_ctrl;
> +
> + if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
> + return -EINVAL;
> +
> + shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
> + ret = tps_65023_read_reg(tps, TPS65023_REG_REG_CTRL, ®_ctrl);
> +
> + if (ret == 0) {
> + reg_ctrl &= (1 << shift);
> + return reg_ctrl ? 1 : 0;
> + } else
> + return ret;
> +}
> +
> +static int tps65023_dcdc_enable(struct regulator_dev *dev)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int dcdc = rdev_get_id(dev);
> + u8 shift;
> +
> + if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
> + return -EINVAL;
> +
> + shift = TPS65023_NUM_REGULATOR - dcdc;
> + return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
> +}
> +
> +static int tps65023_dcdc_disable(struct regulator_dev *dev)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int dcdc = rdev_get_id(dev);
> + u8 shift;
> +
> + if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
> + return -EINVAL;
> +
> + shift = TPS65023_NUM_REGULATOR - dcdc;
> + return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
> +}
> +
> +static int tps65023_ldo_enable(struct regulator_dev *dev)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int ldo = rdev_get_id(dev);
> + u8 shift;
> +
> + if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
> + return -EINVAL;
> +
> + shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
> + return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
> +}
> +
> +static int tps65023_ldo_disable(struct regulator_dev *dev)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int ldo = rdev_get_id(dev);
> + u8 shift;
> +
> + if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
> + return -EINVAL;
> +
> + shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
> + return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
> +}
> +
> +static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
> +{
> + unsigned char reg_ctrl;
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int dcdc = rdev_get_id(dev);
> + int ret;
> +
> + if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
> + return -EINVAL;
> +
> + if (dcdc == TPS65023_DCDC_1) {
> + ret = tps_65023_read_reg(tps, TPS65023_REG_DEF_CORE, ®_ctrl);
> + if (ret < 0)
> + return ret;
> + reg_ctrl &= (tps->info[dcdc]->table_len - 1);
> + return tps->info[dcdc]->table[reg_ctrl] * 1000;
> + } else
> + return tps->info[dcdc]->min_uV;
> +}
> +
> +static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
> + int min_uV, int max_uV)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int dcdc = rdev_get_id(dev);
> + int vsel;
> +
> + if (dcdc != TPS65023_DCDC_1)
> + return -EINVAL;
> +
> + if (min_uV < tps->info[dcdc]->min_uV
> + || min_uV > tps->info[dcdc]->max_uV)
> + return -EINVAL;
> + if (max_uV < tps->info[dcdc]->min_uV
> + || max_uV > tps->info[dcdc]->max_uV)
> + return -EINVAL;
> +
> + for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
> + int mV = tps->info[dcdc]->table[vsel];
> + int uV = mV * 1000;
> +
> + /* Break at the first in-range value */
> + if (min_uV <= uV && uV <= max_uV)
> + break;
> + }
> +
> + /* write to the register */
> + return tps_65023_write_reg(tps, TPS65023_REG_DEF_CORE, vsel);
> +}
> +
> +static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
> +{
> + unsigned char reg_ctrl;
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int ldo = rdev_get_id(dev);
> + int ret;
> +
> + if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
> + return -EINVAL;
> +
> + ret = tps_65023_read_reg(tps, TPS65023_REG_LDO_CTRL, ®_ctrl);
> + if (ret < 0)
> + return ret;
> +
> + reg_ctrl >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
> + reg_ctrl &= (tps->info[ldo]->table_len - 1);
> + return tps->info[ldo]->table[reg_ctrl] * 1000;
> +}
> +
> +static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
> + int min_uV, int max_uV)
> +{
> + struct tps_pmic *tps = rdev_get_drvdata(dev);
> + int ldo = rdev_get_id(dev);
> + int vsel;
> + int ret;
> + unsigned char reg_ctrl;
> +
> + if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
> + return -EINVAL;
> +
> + if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
> + return -EINVAL;
> + if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
> + return -EINVAL;
> +
> + for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
> + int mV = tps->info[ldo]->table[vsel];
> + int uV = mV * 1000;
> +
> + /* Break at the first in-range value */
> + if (min_uV <= uV && uV <= max_uV)
> + break;
> + }
> +
> + ret = tps_65023_read_reg(tps, TPS65023_REG_LDO_CTRL, ®_ctrl);
> +
> + if (ret < 0)
> + return ret;
> +
> + reg_ctrl &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
> + reg_ctrl |=
> + (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
> + return tps_65023_write_reg(tps, TPS65023_REG_LDO_CTRL, reg_ctrl);
> +}
> +
> +/* Operations permitted on VDCDCx */
> +static struct regulator_ops tps65023_dcdc_ops = {
> + .is_enabled = tps65023_dcdc_is_enabled,
> + .enable = tps65023_dcdc_enable,
> + .disable = tps65023_dcdc_disable,
> + .get_voltage = tps65023_dcdc_get_voltage,
> + .set_voltage = tps65023_dcdc_set_voltage,
> +};
> +
> +/* Operations permitted on LDOx */
> +static struct regulator_ops tps65023_ldo_ops = {
> + .is_enabled = tps65023_ldo_is_enabled,
> + .enable = tps65023_ldo_enable,
> + .disable = tps65023_ldo_disable,
> + .get_voltage = tps65023_ldo_get_voltage,
> + .set_voltage = tps65023_ldo_set_voltage,
> +};
> +
> +static
> +int tps_65023_probe(struct i2c_client *client, const struct i2c_device_id *id)
> +{
> + static int desc_id;
> + const struct tps_info *info = (void *)id->driver_data;
> + struct regulator_init_data *init_data;
> + struct regulator_dev *rdev;
> + struct tps_pmic *tps;
> + int i;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> + return -EIO;
> +
> + /**
> + * init_data points to array of regulator_init structures
> + * coming from the board-evm file.
> + */
> + init_data = client->dev.platform_data;
> +
> + if (!init_data)
> + return -EIO;
> +
> + tps = kzalloc(sizeof(*tps), GFP_KERNEL);
> + if (!tps)
> + return -ENOMEM;
> +
> + tps->client = client;
> +
> + for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
> + /* Store regulator specific information */
> + tps->info[i] = info;
> +
> + tps->desc[i].name = info->name;
> + tps->desc[i].id = desc_id++;
> + tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
> + &tps65023_ldo_ops : &tps65023_dcdc_ops);
> + tps->desc[i].type = REGULATOR_VOLTAGE;
> + tps->desc[i].owner = THIS_MODULE;
> +
> + /* Register the regulators */
> + rdev = regulator_register(&tps->desc[i], &client->dev,
> + init_data, tps);
> + if (IS_ERR(rdev)) {
> + dev_err(&client->dev, "failed to register %s\n",
> + id->name);
> + kfree(tps);
> + return PTR_ERR(rdev);
> + }
> +
> + /* Save regulator for cleanup */
> + tps->rdev[i] = rdev;
> + }
> +
> + i2c_set_clientdata(client, tps);
> +
> + return 0;
> +}
> +
> +/**
> + * tps_65023_remove - TPS65023 driver i2c remove handler
> + * @client: i2c driver client device structure
> + *
> + * Unregister TPS driver as an i2c client device driver
> + */
> +static int __devexit tps_65023_remove(struct i2c_client *client)
> +{
> + struct tps_pmic *tps = i2c_get_clientdata(client);
> + int i;
> +
> + for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
> + regulator_unregister(tps->rdev[i]);
> +
> + tps->client = NULL;
> +
> + /* clear the client data in i2c */
> + i2c_set_clientdata(client, NULL);
> + kfree(tps);
> +
> + return 0;
> +}
> +
> +/* Supported voltage values for regulators */
> +static const u16 VDCDC1_VSEL_table[] = {
> + 800, 825, 850, 875,
> + 900, 925, 950, 975,
> + 1000, 1025, 1050, 1075,
> + 1100, 1125, 1150, 1175,
> + 1200, 1225, 1250, 1275,
> + 1300, 1325, 1350, 1375,
> + 1400, 1425, 1450, 1475,
> + 1500, 1525, 1550, 1600,
> +};
> +
> +static const u16 LDO1_VSEL_table[] = {
> + 1000, 1100, 1300, 1800,
> + 2200, 2600, 2800, 3150,
> +};
> +
> +static const u16 LDO2_VSEL_table[] = {
> + 1050, 1200, 1300, 1800,
> + 2500, 2800, 3000, 3300,
> +};
> +
> +static const struct tps_info tps65023_regs[] = {
> + {
> + .name = "VDCDC1",
> + .min_uV = 800000,
> + .max_uV = 1600000,
> + .fixed = 0,
> + .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
> + .table = VDCDC1_VSEL_table,
> + },
> + {
> + .name = "VDCDC2",
> + .min_uV = 3300000,
> + .max_uV = 3300000,
> + .fixed = 1,
> + .table_len = 0,
> + },
> + {
> + .name = "VDCDC3",
> + .min_uV = 1800000,
> + .max_uV = 1800000,
> + .fixed = 1,
> + .table_len = 0,
> + },
> + {
> + .name = "LDO1",
> + .min_uV = 1000000,
> + .max_uV = 3150000,
> + .fixed = 0,
> + .table_len = ARRAY_SIZE(LDO1_VSEL_table),
> + .table = LDO1_VSEL_table,
> + },
> + {
> + .name = "LDO2",
> + .min_uV = 1050000,
> + .max_uV = 3300000,
> + .fixed = 0,
> + .table_len = ARRAY_SIZE(LDO2_VSEL_table),
> + .table = LDO2_VSEL_table,
> + },
> +};
> +
> +static const struct i2c_device_id tps_65023_id = {
> + .name = "tps65023",
> + .driver_data = (unsigned long) &tps65023_regs[0],
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, tps_65023_id);
> +
> +static struct i2c_driver tps_65023_i2c_driver = {
> + .driver = {
> + .name = "tps_65023_pwr",
> + .owner = THIS_MODULE,
> + },
> + .probe = tps_65023_probe,
> + .remove = __devexit_p(tps_65023_remove),
> + .id_table = &tps_65023_id,
> +};
> +
> +/**
> + * tps_65023_init
> + *
> + * Module init function
> + */
> +static int __init tps_65023_init(void)
> +{
> + return i2c_add_driver(&tps_65023_i2c_driver);
> +}
> +subsys_initcall(tps_65023_init);
> +
> +/**
> + * tps_65023_cleanup
> + *
> + * Module exit function
> + */
> +static void __exit tps_65023_cleanup(void)
> +{
> + i2c_del_driver(&tps_65023_i2c_driver);
> +}
> +module_exit(tps_65023_cleanup);
> +
> +MODULE_AUTHOR("Texas Instruments");
> +MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
> +MODULE_LICENSE("GPLv2");
> --
> 1.6.2.4
>
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--
balbi
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