| /* |
| * Copyright (C) 2007 Sascha Hauer, Pengutronix |
| * 2009 Marc Kleine-Budde <mkl@pengutronix.de> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| */ |
| |
| #include <common.h> |
| #include <init.h> |
| #include <driver.h> |
| #include <xfuncs.h> |
| #include <errno.h> |
| #include <spi/spi.h> |
| #include <malloc.h> |
| |
| #include <i2c/i2c.h> |
| #include <mfd/mc13892.h> |
| |
| #define DRIVERNAME "mc13892" |
| |
| #define to_mc13892(a) container_of(a, struct mc13892, cdev) |
| |
| static struct mc13892 *mc_dev; |
| |
| struct mc13892 *mc13892_get(void) |
| { |
| if (!mc_dev) |
| return NULL; |
| |
| return mc_dev; |
| } |
| EXPORT_SYMBOL(mc13892_get); |
| |
| #ifdef CONFIG_SPI |
| static int spi_rw(struct spi_device *spi, void * buf, size_t len) |
| { |
| int ret; |
| |
| struct spi_transfer t = { |
| .tx_buf = (const void *)buf, |
| .rx_buf = buf, |
| .len = len, |
| .cs_change = 0, |
| .delay_usecs = 0, |
| }; |
| struct spi_message m; |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| |
| if ((ret = spi_sync(spi, &m))) |
| return ret; |
| return 0; |
| } |
| |
| #define MXC_PMIC_REG_NUM(reg) (((reg) & 0x3f) << 25) |
| #define MXC_PMIC_WRITE (1 << 31) |
| |
| static int mc13892_spi_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val) |
| { |
| uint32_t buf; |
| |
| buf = MXC_PMIC_REG_NUM(reg); |
| |
| spi_rw(mc13892->spi, &buf, 4); |
| |
| *val = buf; |
| |
| return 0; |
| } |
| |
| static int mc13892_spi_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val) |
| { |
| uint32_t buf = MXC_PMIC_REG_NUM(reg) | MXC_PMIC_WRITE | (val & 0xffffff); |
| |
| spi_rw(mc13892->spi, &buf, 4); |
| |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_I2C |
| static int mc13892_i2c_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val) |
| { |
| u8 buf[3]; |
| int ret; |
| |
| ret = i2c_read_reg(mc13892->client, reg, buf, 3); |
| *val = buf[0] << 16 | buf[1] << 8 | buf[2] << 0; |
| |
| return ret == 3 ? 0 : ret; |
| } |
| |
| static int mc13892_i2c_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val) |
| { |
| u8 buf[] = { |
| val >> 16, |
| val >> 8, |
| val >> 0, |
| }; |
| int ret; |
| |
| ret = i2c_write_reg(mc13892->client, reg, buf, 3); |
| |
| return ret == 3 ? 0 : ret; |
| } |
| #endif |
| |
| int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val) |
| { |
| #ifdef CONFIG_I2C |
| if (mc13892->mode == MC13892_MODE_I2C) |
| return mc13892_i2c_reg_write(mc13892, reg, val); |
| #endif |
| #ifdef CONFIG_SPI |
| if (mc13892->mode == MC13892_MODE_SPI) |
| return mc13892_spi_reg_write(mc13892, reg, val); |
| #endif |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL(mc13892_reg_write); |
| |
| int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val) |
| { |
| #ifdef CONFIG_I2C |
| if (mc13892->mode == MC13892_MODE_I2C) |
| return mc13892_i2c_reg_read(mc13892, reg, val); |
| #endif |
| #ifdef CONFIG_SPI |
| if (mc13892->mode == MC13892_MODE_SPI) |
| return mc13892_spi_reg_read(mc13892, reg, val); |
| #endif |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL(mc13892_reg_read); |
| |
| int mc13892_set_bits(struct mc13892 *mc13892, enum mc13892_reg reg, u32 mask, u32 val) |
| { |
| u32 tmp; |
| int err; |
| |
| err = mc13892_reg_read(mc13892, reg, &tmp); |
| tmp = (tmp & ~mask) | val; |
| |
| if (!err) |
| err = mc13892_reg_write(mc13892, reg, tmp); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(mc13892_set_bits); |
| |
| static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags) |
| { |
| struct mc13892 *priv = to_mc13892(cdev); |
| u32 *buf = _buf; |
| size_t i = count >> 2; |
| int err; |
| |
| offset >>= 2; |
| |
| while (i) { |
| err = mc13892_reg_read(priv, offset, buf); |
| if (err) |
| return (ssize_t)err; |
| buf++; |
| i--; |
| offset++; |
| } |
| |
| return count; |
| } |
| |
| static ssize_t mc_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags) |
| { |
| struct mc13892 *mc13892 = to_mc13892(cdev); |
| const u32 *buf = _buf; |
| size_t i = count >> 2; |
| int err; |
| |
| offset >>= 2; |
| |
| while (i) { |
| err = mc13892_reg_write(mc13892, offset, *buf); |
| if (err) |
| return (ssize_t)err; |
| buf++; |
| i--; |
| offset++; |
| } |
| |
| return count; |
| } |
| |
| static struct file_operations mc_fops = { |
| .lseek = dev_lseek_default, |
| .read = mc_read, |
| .write = mc_write, |
| }; |
| |
| struct mc13892_rev { |
| u16 rev_id; |
| enum mc13892_revision rev; |
| char *revstr; |
| }; |
| |
| static struct mc13892_rev mc13892_revisions[] = { |
| { 0x01, MC13892_REVISION_1_0, "1.0" }, |
| { 0x09, MC13892_REVISION_1_1, "1.1" }, |
| { 0x0a, MC13892_REVISION_1_2, "1.2" }, |
| { 0x10, MC13892_REVISION_2_0, "2.0" }, |
| { 0x11, MC13892_REVISION_2_1, "2.1" }, |
| { 0x18, MC13892_REVISION_3_0, "3.0" }, |
| { 0x19, MC13892_REVISION_3_1, "3.1" }, |
| { 0x1a, MC13892_REVISION_3_2, "3.2" }, |
| { 0x02, MC13892_REVISION_3_2a, "3.2a" }, |
| { 0x1b, MC13892_REVISION_3_3, "3.3" }, |
| { 0x1d, MC13892_REVISION_3_5, "3.5" }, |
| }; |
| |
| static int mc13893_query_revision(struct mc13892 *mc13892) |
| { |
| unsigned int rev_id; |
| char *revstr; |
| int rev, i; |
| |
| mc13892_reg_read(mc13892, 7, &rev_id); |
| |
| for (i = 0; i < ARRAY_SIZE(mc13892_revisions); i++) |
| if ((rev_id & 0x1f) == mc13892_revisions[i].rev_id) |
| break; |
| |
| if (i == ARRAY_SIZE(mc13892_revisions)) |
| return -EINVAL; |
| |
| rev = mc13892_revisions[i].rev; |
| revstr = mc13892_revisions[i].revstr; |
| |
| if (rev == MC13892_REVISION_2_0) { |
| if ((rev_id >> 9) & 0x3) { |
| rev = MC13892_REVISION_2_0a; |
| revstr = "2.0a"; |
| } |
| } |
| |
| dev_info(mc_dev->cdev.dev, "PMIC ID: 0x%08x [Rev: %s]\n", |
| rev_id, revstr); |
| |
| mc13892->revision = rev; |
| |
| return rev; |
| } |
| |
| static int mc_probe(struct device_d *dev, enum mc13892_mode mode) |
| { |
| int rev; |
| |
| if (mc_dev) |
| return -EBUSY; |
| |
| mc_dev = xzalloc(sizeof(struct mc13892)); |
| mc_dev->mode = mode; |
| mc_dev->cdev.name = DRIVERNAME; |
| if (mode == MC13892_MODE_I2C) { |
| mc_dev->client = to_i2c_client(dev); |
| } |
| if (mode == MC13892_MODE_SPI) { |
| mc_dev->spi = dev->type_data; |
| mc_dev->spi->mode = SPI_MODE_0 | SPI_CS_HIGH; |
| mc_dev->spi->bits_per_word = 32; |
| } |
| mc_dev->cdev.size = 256; |
| mc_dev->cdev.dev = dev; |
| mc_dev->cdev.ops = &mc_fops; |
| |
| rev = mc13893_query_revision(mc_dev); |
| if (rev < 0) { |
| free(mc_dev); |
| return -EINVAL; |
| } |
| |
| devfs_create(&mc_dev->cdev); |
| |
| return 0; |
| } |
| |
| static int mc_i2c_probe(struct device_d *dev) |
| { |
| return mc_probe(dev, MC13892_MODE_I2C); |
| } |
| |
| static int mc_spi_probe(struct device_d *dev) |
| { |
| return mc_probe(dev, MC13892_MODE_SPI); |
| } |
| |
| static struct driver_d mc_i2c_driver = { |
| .name = "mc13892-i2c", |
| .probe = mc_i2c_probe, |
| }; |
| |
| static struct driver_d mc_spi_driver = { |
| .name = "mc13892-spi", |
| .probe = mc_spi_probe, |
| }; |
| |
| static int mc_init(void) |
| { |
| register_driver(&mc_i2c_driver); |
| register_driver(&mc_spi_driver); |
| return 0; |
| } |
| |
| device_initcall(mc_init); |