995 lines
22 KiB
C
995 lines
22 KiB
C
/*
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* Copyright (C) 2007-2009 ST-Ericsson
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* License terms: GNU General Public License (GPL) version 2
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* Low-level core for exclusive access to the AB3100 IC on the I2C bus
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* and some basic chip-configuration.
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*/
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/notifier.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/mfd/ab3100.h>
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/* These are the only registers inside AB3100 used in this main file */
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/* Interrupt event registers */
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#define AB3100_EVENTA1 0x21
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#define AB3100_EVENTA2 0x22
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#define AB3100_EVENTA3 0x23
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/* AB3100 DAC converter registers */
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#define AB3100_DIS 0x00
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#define AB3100_D0C 0x01
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#define AB3100_D1C 0x02
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#define AB3100_D2C 0x03
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#define AB3100_D3C 0x04
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/* Chip ID register */
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#define AB3100_CID 0x20
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/* AB3100 interrupt registers */
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#define AB3100_IMRA1 0x24
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#define AB3100_IMRA2 0x25
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#define AB3100_IMRA3 0x26
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#define AB3100_IMRB1 0x2B
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#define AB3100_IMRB2 0x2C
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#define AB3100_IMRB3 0x2D
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/* System Power Monitoring and control registers */
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#define AB3100_MCA 0x2E
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#define AB3100_MCB 0x2F
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/* SIM power up */
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#define AB3100_SUP 0x50
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/*
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* I2C communication
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*
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* The AB3100 is usually assigned address 0x48 (7-bit)
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* The chip is defined in the platform i2c_board_data section.
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*/
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u8 ab3100_get_chip_type(struct ab3100 *ab3100)
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{
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u8 chip = ABUNKNOWN;
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switch (ab3100->chip_id & 0xf0) {
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case 0xa0:
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chip = AB3000;
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break;
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case 0xc0:
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chip = AB3100;
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break;
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}
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return chip;
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}
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EXPORT_SYMBOL(ab3100_get_chip_type);
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int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval)
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{
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u8 regandval[2] = {reg, regval};
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int err;
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err = mutex_lock_interruptible(&ab3100->access_mutex);
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if (err)
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return err;
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/*
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* A two-byte write message with the first byte containing the register
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* number and the second byte containing the value to be written
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* effectively sets a register in the AB3100.
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*/
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err = i2c_master_send(ab3100->i2c_client, regandval, 2);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (write register): %d\n",
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err);
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} else if (err != 2) {
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dev_err(ab3100->dev,
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"write error (write register) "
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"%d bytes transferred (expected 2)\n",
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err);
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err = -EIO;
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} else {
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/* All is well */
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err = 0;
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}
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mutex_unlock(&ab3100->access_mutex);
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return err;
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}
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EXPORT_SYMBOL(ab3100_set_register_interruptible);
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/*
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* The test registers exist at an I2C bus address up one
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* from the ordinary base. They are not supposed to be used
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* in production code, but sometimes you have to do that
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* anyway. It's currently only used from this file so declare
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* it static and do not export.
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*/
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static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
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u8 reg, u8 regval)
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{
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u8 regandval[2] = {reg, regval};
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int err;
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err = mutex_lock_interruptible(&ab3100->access_mutex);
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if (err)
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return err;
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err = i2c_master_send(ab3100->testreg_client, regandval, 2);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (write test register): %d\n",
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err);
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} else if (err != 2) {
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dev_err(ab3100->dev,
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"write error (write test register) "
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"%d bytes transferred (expected 2)\n",
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err);
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err = -EIO;
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} else {
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/* All is well */
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err = 0;
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}
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mutex_unlock(&ab3100->access_mutex);
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return err;
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}
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int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval)
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{
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int err;
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err = mutex_lock_interruptible(&ab3100->access_mutex);
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if (err)
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return err;
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/*
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* AB3100 require an I2C "stop" command between each message, else
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* it will not work. The only way of achieveing this with the
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* message transport layer is to send the read and write messages
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* separately.
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*/
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err = i2c_master_send(ab3100->i2c_client, ®, 1);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (send register address): %d\n",
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err);
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goto get_reg_out_unlock;
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} else if (err != 1) {
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dev_err(ab3100->dev,
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"write error (send register address) "
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"%d bytes transferred (expected 1)\n",
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err);
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err = -EIO;
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goto get_reg_out_unlock;
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} else {
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/* All is well */
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err = 0;
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}
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err = i2c_master_recv(ab3100->i2c_client, regval, 1);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (read register): %d\n",
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err);
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goto get_reg_out_unlock;
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} else if (err != 1) {
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dev_err(ab3100->dev,
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"write error (read register) "
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"%d bytes transferred (expected 1)\n",
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err);
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err = -EIO;
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goto get_reg_out_unlock;
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} else {
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/* All is well */
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err = 0;
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}
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get_reg_out_unlock:
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mutex_unlock(&ab3100->access_mutex);
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return err;
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}
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EXPORT_SYMBOL(ab3100_get_register_interruptible);
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int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
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u8 first_reg, u8 *regvals, u8 numregs)
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{
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int err;
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if (ab3100->chip_id == 0xa0 ||
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ab3100->chip_id == 0xa1)
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/* These don't support paged reads */
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return -EIO;
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err = mutex_lock_interruptible(&ab3100->access_mutex);
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if (err)
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return err;
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/*
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* Paged read also require an I2C "stop" command.
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*/
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err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (send first register address): %d\n",
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err);
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goto get_reg_page_out_unlock;
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} else if (err != 1) {
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dev_err(ab3100->dev,
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"write error (send first register address) "
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"%d bytes transferred (expected 1)\n",
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err);
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err = -EIO;
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goto get_reg_page_out_unlock;
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}
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err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (read register page): %d\n",
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err);
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goto get_reg_page_out_unlock;
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} else if (err != numregs) {
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dev_err(ab3100->dev,
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"write error (read register page) "
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"%d bytes transferred (expected %d)\n",
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err, numregs);
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err = -EIO;
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goto get_reg_page_out_unlock;
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}
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/* All is well */
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err = 0;
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get_reg_page_out_unlock:
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mutex_unlock(&ab3100->access_mutex);
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return err;
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}
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EXPORT_SYMBOL(ab3100_get_register_page_interruptible);
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int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
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u8 reg, u8 andmask, u8 ormask)
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{
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u8 regandval[2] = {reg, 0};
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int err;
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err = mutex_lock_interruptible(&ab3100->access_mutex);
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if (err)
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return err;
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/* First read out the target register */
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err = i2c_master_send(ab3100->i2c_client, ®, 1);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (maskset send address): %d\n",
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err);
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goto get_maskset_unlock;
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} else if (err != 1) {
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dev_err(ab3100->dev,
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"write error (maskset send address) "
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"%d bytes transferred (expected 1)\n",
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err);
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err = -EIO;
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goto get_maskset_unlock;
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}
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err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (maskset read register): %d\n",
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err);
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goto get_maskset_unlock;
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} else if (err != 1) {
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dev_err(ab3100->dev,
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"write error (maskset read register) "
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"%d bytes transferred (expected 1)\n",
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err);
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err = -EIO;
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goto get_maskset_unlock;
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}
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/* Modify the register */
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regandval[1] &= andmask;
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regandval[1] |= ormask;
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/* Write the register */
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err = i2c_master_send(ab3100->i2c_client, regandval, 2);
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if (err < 0) {
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dev_err(ab3100->dev,
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"write error (write register): %d\n",
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err);
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goto get_maskset_unlock;
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} else if (err != 2) {
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dev_err(ab3100->dev,
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"write error (write register) "
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"%d bytes transferred (expected 2)\n",
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err);
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err = -EIO;
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goto get_maskset_unlock;
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}
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/* All is well */
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err = 0;
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get_maskset_unlock:
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mutex_unlock(&ab3100->access_mutex);
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return err;
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}
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EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible);
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/*
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* Register a simple callback for handling any AB3100 events.
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*/
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int ab3100_event_register(struct ab3100 *ab3100,
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struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&ab3100->event_subscribers,
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nb);
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}
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EXPORT_SYMBOL(ab3100_event_register);
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/*
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* Remove a previously registered callback.
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*/
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int ab3100_event_unregister(struct ab3100 *ab3100,
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struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
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nb);
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}
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EXPORT_SYMBOL(ab3100_event_unregister);
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int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
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u32 *fatevent)
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{
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if (!ab3100->startup_events_read)
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return -EAGAIN; /* Try again later */
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*fatevent = ab3100->startup_events;
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return 0;
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}
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EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
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/* Interrupt handling worker */
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static void ab3100_work(struct work_struct *work)
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{
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struct ab3100 *ab3100 = container_of(work, struct ab3100, work);
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u8 event_regs[3];
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u32 fatevent;
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int err;
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err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
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event_regs, 3);
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if (err)
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goto err_event_wq;
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fatevent = (event_regs[0] << 16) |
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(event_regs[1] << 8) |
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event_regs[2];
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if (!ab3100->startup_events_read) {
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ab3100->startup_events = fatevent;
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ab3100->startup_events_read = true;
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}
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/*
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* The notified parties will have to mask out the events
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* they're interested in and react to them. They will be
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* notified on all events, then they use the fatevent value
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* to determine if they're interested.
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*/
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blocking_notifier_call_chain(&ab3100->event_subscribers,
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fatevent, NULL);
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dev_dbg(ab3100->dev,
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"IRQ Event: 0x%08x\n", fatevent);
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/* By now the IRQ should be acked and deasserted so enable it again */
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enable_irq(ab3100->i2c_client->irq);
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return;
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err_event_wq:
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dev_dbg(ab3100->dev,
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"error in event workqueue\n");
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/* Enable the IRQ anyway, what choice do we have? */
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enable_irq(ab3100->i2c_client->irq);
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return;
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}
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static irqreturn_t ab3100_irq_handler(int irq, void *data)
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{
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struct ab3100 *ab3100 = data;
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/*
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* Disable the IRQ and dispatch a worker to handle the
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* event. Since the chip resides on I2C this is slow
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* stuff and we will re-enable the interrupts once th
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* worker has finished.
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*/
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disable_irq_nosync(irq);
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schedule_work(&ab3100->work);
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_DEBUG_FS
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/*
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* Some debugfs entries only exposed if we're using debug
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*/
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static int ab3100_registers_print(struct seq_file *s, void *p)
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{
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struct ab3100 *ab3100 = s->private;
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u8 value;
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u8 reg;
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seq_printf(s, "AB3100 registers:\n");
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for (reg = 0; reg < 0xff; reg++) {
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ab3100_get_register_interruptible(ab3100, reg, &value);
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seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
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}
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return 0;
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}
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static int ab3100_registers_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ab3100_registers_print, inode->i_private);
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}
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static const struct file_operations ab3100_registers_fops = {
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.open = ab3100_registers_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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struct ab3100_get_set_reg_priv {
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struct ab3100 *ab3100;
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bool mode;
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};
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static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static ssize_t ab3100_get_set_reg(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct ab3100_get_set_reg_priv *priv = file->private_data;
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struct ab3100 *ab3100 = priv->ab3100;
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char buf[32];
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ssize_t buf_size;
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int regp;
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unsigned long user_reg;
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int err;
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int i = 0;
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/* Get userspace string and assure termination */
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buf_size = min(count, (sizeof(buf)-1));
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if (copy_from_user(buf, user_buf, buf_size))
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return -EFAULT;
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buf[buf_size] = 0;
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/*
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* The idea is here to parse a string which is either
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* "0xnn" for reading a register, or "0xaa 0xbb" for
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* writing 0xbb to the register 0xaa. First move past
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* whitespace and then begin to parse the register.
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*/
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while ((i < buf_size) && (buf[i] == ' '))
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i++;
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regp = i;
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/*
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* Advance pointer to end of string then terminate
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* the register string. This is needed to satisfy
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* the strict_strtoul() function.
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*/
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while ((i < buf_size) && (buf[i] != ' '))
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i++;
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buf[i] = '\0';
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err = strict_strtoul(&buf[regp], 16, &user_reg);
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if (err)
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return err;
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if (user_reg > 0xff)
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return -EINVAL;
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/* Either we read or we write a register here */
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if (!priv->mode) {
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/* Reading */
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u8 reg = (u8) user_reg;
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u8 regvalue;
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ab3100_get_register_interruptible(ab3100, reg, ®value);
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dev_info(ab3100->dev,
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"debug read AB3100 reg[0x%02x]: 0x%02x\n",
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reg, regvalue);
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} else {
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int valp;
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unsigned long user_value;
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u8 reg = (u8) user_reg;
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u8 value;
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u8 regvalue;
|
|
|
|
/*
|
|
* Writing, we need some value to write to
|
|
* the register so keep parsing the string
|
|
* from userspace.
|
|
*/
|
|
i++;
|
|
while ((i < buf_size) && (buf[i] == ' '))
|
|
i++;
|
|
valp = i;
|
|
while ((i < buf_size) && (buf[i] != ' '))
|
|
i++;
|
|
buf[i] = '\0';
|
|
|
|
err = strict_strtoul(&buf[valp], 16, &user_value);
|
|
if (err)
|
|
return err;
|
|
if (user_reg > 0xff)
|
|
return -EINVAL;
|
|
|
|
value = (u8) user_value;
|
|
ab3100_set_register_interruptible(ab3100, reg, value);
|
|
ab3100_get_register_interruptible(ab3100, reg, ®value);
|
|
|
|
dev_info(ab3100->dev,
|
|
"debug write reg[0x%02x] with 0x%02x, "
|
|
"after readback: 0x%02x\n",
|
|
reg, value, regvalue);
|
|
}
|
|
return buf_size;
|
|
}
|
|
|
|
static const struct file_operations ab3100_get_set_reg_fops = {
|
|
.open = ab3100_get_set_reg_open_file,
|
|
.write = ab3100_get_set_reg,
|
|
};
|
|
|
|
static struct dentry *ab3100_dir;
|
|
static struct dentry *ab3100_reg_file;
|
|
static struct ab3100_get_set_reg_priv ab3100_get_priv;
|
|
static struct dentry *ab3100_get_reg_file;
|
|
static struct ab3100_get_set_reg_priv ab3100_set_priv;
|
|
static struct dentry *ab3100_set_reg_file;
|
|
|
|
static void ab3100_setup_debugfs(struct ab3100 *ab3100)
|
|
{
|
|
int err;
|
|
|
|
ab3100_dir = debugfs_create_dir("ab3100", NULL);
|
|
if (!ab3100_dir)
|
|
goto exit_no_debugfs;
|
|
|
|
ab3100_reg_file = debugfs_create_file("registers",
|
|
S_IRUGO, ab3100_dir, ab3100,
|
|
&ab3100_registers_fops);
|
|
if (!ab3100_reg_file) {
|
|
err = -ENOMEM;
|
|
goto exit_destroy_dir;
|
|
}
|
|
|
|
ab3100_get_priv.ab3100 = ab3100;
|
|
ab3100_get_priv.mode = false;
|
|
ab3100_get_reg_file = debugfs_create_file("get_reg",
|
|
S_IWUGO, ab3100_dir, &ab3100_get_priv,
|
|
&ab3100_get_set_reg_fops);
|
|
if (!ab3100_get_reg_file) {
|
|
err = -ENOMEM;
|
|
goto exit_destroy_reg;
|
|
}
|
|
|
|
ab3100_set_priv.ab3100 = ab3100;
|
|
ab3100_set_priv.mode = true;
|
|
ab3100_set_reg_file = debugfs_create_file("set_reg",
|
|
S_IWUGO, ab3100_dir, &ab3100_set_priv,
|
|
&ab3100_get_set_reg_fops);
|
|
if (!ab3100_set_reg_file) {
|
|
err = -ENOMEM;
|
|
goto exit_destroy_get_reg;
|
|
}
|
|
return;
|
|
|
|
exit_destroy_get_reg:
|
|
debugfs_remove(ab3100_get_reg_file);
|
|
exit_destroy_reg:
|
|
debugfs_remove(ab3100_reg_file);
|
|
exit_destroy_dir:
|
|
debugfs_remove(ab3100_dir);
|
|
exit_no_debugfs:
|
|
return;
|
|
}
|
|
static inline void ab3100_remove_debugfs(void)
|
|
{
|
|
debugfs_remove(ab3100_set_reg_file);
|
|
debugfs_remove(ab3100_get_reg_file);
|
|
debugfs_remove(ab3100_reg_file);
|
|
debugfs_remove(ab3100_dir);
|
|
}
|
|
#else
|
|
static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
|
|
{
|
|
}
|
|
static inline void ab3100_remove_debugfs(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Basic set-up, datastructure creation/destruction and I2C interface.
|
|
* This sets up a default config in the AB3100 chip so that it
|
|
* will work as expected.
|
|
*/
|
|
|
|
struct ab3100_init_setting {
|
|
u8 abreg;
|
|
u8 setting;
|
|
};
|
|
|
|
static const struct ab3100_init_setting __initconst
|
|
ab3100_init_settings[] = {
|
|
{
|
|
.abreg = AB3100_MCA,
|
|
.setting = 0x01
|
|
}, {
|
|
.abreg = AB3100_MCB,
|
|
.setting = 0x30
|
|
}, {
|
|
.abreg = AB3100_IMRA1,
|
|
.setting = 0x00
|
|
}, {
|
|
.abreg = AB3100_IMRA2,
|
|
.setting = 0xFF
|
|
}, {
|
|
.abreg = AB3100_IMRA3,
|
|
.setting = 0x01
|
|
}, {
|
|
.abreg = AB3100_IMRB1,
|
|
.setting = 0xBF
|
|
}, {
|
|
.abreg = AB3100_IMRB2,
|
|
.setting = 0xFF
|
|
}, {
|
|
.abreg = AB3100_IMRB3,
|
|
.setting = 0xFF
|
|
}, {
|
|
.abreg = AB3100_SUP,
|
|
.setting = 0x00
|
|
}, {
|
|
.abreg = AB3100_DIS,
|
|
.setting = 0xF0
|
|
}, {
|
|
.abreg = AB3100_D0C,
|
|
.setting = 0x00
|
|
}, {
|
|
.abreg = AB3100_D1C,
|
|
.setting = 0x00
|
|
}, {
|
|
.abreg = AB3100_D2C,
|
|
.setting = 0x00
|
|
}, {
|
|
.abreg = AB3100_D3C,
|
|
.setting = 0x00
|
|
},
|
|
};
|
|
|
|
static int __init ab3100_setup(struct ab3100 *ab3100)
|
|
{
|
|
int err = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
|
|
err = ab3100_set_register_interruptible(ab3100,
|
|
ab3100_init_settings[i].abreg,
|
|
ab3100_init_settings[i].setting);
|
|
if (err)
|
|
goto exit_no_setup;
|
|
}
|
|
|
|
/*
|
|
* Special trick to make the AB3100 use the 32kHz clock (RTC)
|
|
* bit 3 in test register 0x02 is a special, undocumented test
|
|
* register bit that only exist in AB3100 P1E
|
|
*/
|
|
if (ab3100->chip_id == 0xc4) {
|
|
dev_warn(ab3100->dev,
|
|
"AB3100 P1E variant detected, "
|
|
"forcing chip to 32KHz\n");
|
|
err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08);
|
|
}
|
|
|
|
exit_no_setup:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Here we define all the platform devices that appear
|
|
* as children of the AB3100. These are regular platform
|
|
* devices with the IORESOURCE_IO .start and .end set
|
|
* to correspond to the internal AB3100 register range
|
|
* mapping to the corresponding subdevice.
|
|
*/
|
|
|
|
#define AB3100_DEVICE(devname, devid) \
|
|
static struct platform_device ab3100_##devname##_device = { \
|
|
.name = devid, \
|
|
.id = -1, \
|
|
}
|
|
|
|
/*
|
|
* This lists all the subdevices and corresponding register
|
|
* ranges.
|
|
*/
|
|
AB3100_DEVICE(dac, "ab3100-dac");
|
|
AB3100_DEVICE(leds, "ab3100-leds");
|
|
AB3100_DEVICE(power, "ab3100-power");
|
|
AB3100_DEVICE(regulators, "ab3100-regulators");
|
|
AB3100_DEVICE(sim, "ab3100-sim");
|
|
AB3100_DEVICE(uart, "ab3100-uart");
|
|
AB3100_DEVICE(rtc, "ab3100-rtc");
|
|
AB3100_DEVICE(charger, "ab3100-charger");
|
|
AB3100_DEVICE(boost, "ab3100-boost");
|
|
AB3100_DEVICE(adc, "ab3100-adc");
|
|
AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
|
|
AB3100_DEVICE(vibrator, "ab3100-vibrator");
|
|
AB3100_DEVICE(otp, "ab3100-otp");
|
|
AB3100_DEVICE(codec, "ab3100-codec");
|
|
|
|
static struct platform_device *
|
|
ab3100_platform_devs[] = {
|
|
&ab3100_dac_device,
|
|
&ab3100_leds_device,
|
|
&ab3100_power_device,
|
|
&ab3100_regulators_device,
|
|
&ab3100_sim_device,
|
|
&ab3100_uart_device,
|
|
&ab3100_rtc_device,
|
|
&ab3100_charger_device,
|
|
&ab3100_boost_device,
|
|
&ab3100_adc_device,
|
|
&ab3100_fuelgauge_device,
|
|
&ab3100_vibrator_device,
|
|
&ab3100_otp_device,
|
|
&ab3100_codec_device,
|
|
};
|
|
|
|
struct ab_family_id {
|
|
u8 id;
|
|
char *name;
|
|
};
|
|
|
|
static const struct ab_family_id ids[] __initdata = {
|
|
/* AB3100 */
|
|
{
|
|
.id = 0xc0,
|
|
.name = "P1A"
|
|
}, {
|
|
.id = 0xc1,
|
|
.name = "P1B"
|
|
}, {
|
|
.id = 0xc2,
|
|
.name = "P1C"
|
|
}, {
|
|
.id = 0xc3,
|
|
.name = "P1D"
|
|
}, {
|
|
.id = 0xc4,
|
|
.name = "P1E"
|
|
}, {
|
|
.id = 0xc5,
|
|
.name = "P1F/R1A"
|
|
}, {
|
|
.id = 0xc6,
|
|
.name = "P1G/R1A"
|
|
}, {
|
|
.id = 0xc7,
|
|
.name = "P2A/R2A"
|
|
}, {
|
|
.id = 0xc8,
|
|
.name = "P2B/R2B"
|
|
},
|
|
/* AB3000 variants, not supported */
|
|
{
|
|
.id = 0xa0
|
|
}, {
|
|
.id = 0xa1
|
|
}, {
|
|
.id = 0xa2
|
|
}, {
|
|
.id = 0xa3
|
|
}, {
|
|
.id = 0xa4
|
|
}, {
|
|
.id = 0xa5
|
|
}, {
|
|
.id = 0xa6
|
|
}, {
|
|
.id = 0xa7
|
|
},
|
|
/* Terminator */
|
|
{
|
|
.id = 0x00,
|
|
},
|
|
};
|
|
|
|
static int __init ab3100_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ab3100 *ab3100;
|
|
struct ab3100_platform_data *ab3100_plf_data =
|
|
client->dev.platform_data;
|
|
int err;
|
|
int i;
|
|
|
|
ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
|
|
if (!ab3100) {
|
|
dev_err(&client->dev, "could not allocate AB3100 device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Initialize data structure */
|
|
mutex_init(&ab3100->access_mutex);
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
|
|
|
|
ab3100->i2c_client = client;
|
|
ab3100->dev = &ab3100->i2c_client->dev;
|
|
|
|
i2c_set_clientdata(client, ab3100);
|
|
|
|
/* Read chip ID register */
|
|
err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
|
|
&ab3100->chip_id);
|
|
if (err) {
|
|
dev_err(&client->dev,
|
|
"could not communicate with the AB3100 analog "
|
|
"baseband chip\n");
|
|
goto exit_no_detect;
|
|
}
|
|
|
|
for (i = 0; ids[i].id != 0x0; i++) {
|
|
if (ids[i].id == ab3100->chip_id) {
|
|
if (ids[i].name != NULL) {
|
|
snprintf(&ab3100->chip_name[0],
|
|
sizeof(ab3100->chip_name) - 1,
|
|
"AB3100 %s",
|
|
ids[i].name);
|
|
break;
|
|
} else {
|
|
dev_err(&client->dev,
|
|
"AB3000 is not supported\n");
|
|
goto exit_no_detect;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ids[i].id == 0x0) {
|
|
dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
|
|
ab3100->chip_id);
|
|
dev_err(&client->dev, "accepting it anyway. Please update "
|
|
"the driver.\n");
|
|
goto exit_no_detect;
|
|
}
|
|
|
|
dev_info(&client->dev, "Detected chip: %s\n",
|
|
&ab3100->chip_name[0]);
|
|
|
|
/* Attach a second dummy i2c_client to the test register address */
|
|
ab3100->testreg_client = i2c_new_dummy(client->adapter,
|
|
client->addr + 1);
|
|
if (!ab3100->testreg_client) {
|
|
err = -ENOMEM;
|
|
goto exit_no_testreg_client;
|
|
}
|
|
|
|
err = ab3100_setup(ab3100);
|
|
if (err)
|
|
goto exit_no_setup;
|
|
|
|
INIT_WORK(&ab3100->work, ab3100_work);
|
|
|
|
/* This real unpredictable IRQ is of course sampled for entropy */
|
|
err = request_irq(client->irq, ab3100_irq_handler,
|
|
IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
|
|
"AB3100 IRQ", ab3100);
|
|
if (err)
|
|
goto exit_no_irq;
|
|
|
|
/* Set parent and a pointer back to the container in device data */
|
|
for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
|
|
ab3100_platform_devs[i]->dev.parent =
|
|
&client->dev;
|
|
ab3100_platform_devs[i]->dev.platform_data =
|
|
ab3100_plf_data;
|
|
platform_set_drvdata(ab3100_platform_devs[i], ab3100);
|
|
}
|
|
|
|
/* Register the platform devices */
|
|
platform_add_devices(ab3100_platform_devs,
|
|
ARRAY_SIZE(ab3100_platform_devs));
|
|
|
|
ab3100_setup_debugfs(ab3100);
|
|
|
|
return 0;
|
|
|
|
exit_no_irq:
|
|
exit_no_setup:
|
|
i2c_unregister_device(ab3100->testreg_client);
|
|
exit_no_testreg_client:
|
|
exit_no_detect:
|
|
kfree(ab3100);
|
|
return err;
|
|
}
|
|
|
|
static int __exit ab3100_remove(struct i2c_client *client)
|
|
{
|
|
struct ab3100 *ab3100 = i2c_get_clientdata(client);
|
|
int i;
|
|
|
|
/* Unregister subdevices */
|
|
for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
|
|
platform_device_unregister(ab3100_platform_devs[i]);
|
|
|
|
ab3100_remove_debugfs();
|
|
i2c_unregister_device(ab3100->testreg_client);
|
|
|
|
/*
|
|
* At this point, all subscribers should have unregistered
|
|
* their notifiers so deactivate IRQ
|
|
*/
|
|
free_irq(client->irq, ab3100);
|
|
kfree(ab3100);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ab3100_id[] = {
|
|
{ "ab3100", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ab3100_id);
|
|
|
|
static struct i2c_driver ab3100_driver = {
|
|
.driver = {
|
|
.name = "ab3100",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = ab3100_id,
|
|
.probe = ab3100_probe,
|
|
.remove = __exit_p(ab3100_remove),
|
|
};
|
|
|
|
static int __init ab3100_i2c_init(void)
|
|
{
|
|
return i2c_add_driver(&ab3100_driver);
|
|
}
|
|
|
|
static void __exit ab3100_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&ab3100_driver);
|
|
}
|
|
|
|
subsys_initcall(ab3100_i2c_init);
|
|
module_exit(ab3100_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
|
|
MODULE_DESCRIPTION("AB3100 core driver");
|
|
MODULE_LICENSE("GPL");
|