0f63bdedcc
The I2C core always reports the MODALIAS uevent as "i2c:<client name" regardless if the driver was matched using the I2C id_table or the of_match_table. So the driver needs to export the I2C table and this be built into the module or udev won't have the necessary information to auto load the correct module when the device is added. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/*
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* Core driver for STw4810/STw4811
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*
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* Copyright (C) 2013 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/stw481x.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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/*
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* This driver can only access the non-USB portions of STw4811, the register
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* range 0x00-0x10 dealing with USB is bound to the two special I2C pins used
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* for USB control.
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*/
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/* Registers inside the power control address space */
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#define STW_PC_VCORE_SEL 0x05U
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#define STW_PC_VAUX_SEL 0x06U
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#define STW_PC_VPLL_SEL 0x07U
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/**
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* stw481x_get_pctl_reg() - get a power control register
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* @stw481x: handle to the stw481x chip
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* @reg: power control register to fetch
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*
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* The power control registers is a set of one-time-programmable registers
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* in its own register space, accessed by writing addess bits to these
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* two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of
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* the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of
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* the address, forming an address space of 5 bits, i.e. 32 registers
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* 0x00 ... 0x1f can be obtained.
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*/
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static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg)
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{
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u8 msb = (reg >> 3) & 0x03;
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u8 lsb = (reg << 5) & 0xe0;
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unsigned int val;
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u8 vrfy;
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int ret;
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ret = regmap_write(stw481x->map, STW_PCTL_REG_HI, msb);
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if (ret)
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return ret;
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ret = regmap_write(stw481x->map, STW_PCTL_REG_LO, lsb);
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if (ret)
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return ret;
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ret = regmap_read(stw481x->map, STW_PCTL_REG_HI, &val);
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if (ret)
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return ret;
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vrfy = (val & 0x03) << 3;
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ret = regmap_read(stw481x->map, STW_PCTL_REG_LO, &val);
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if (ret)
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return ret;
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vrfy |= ((val >> 5) & 0x07);
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if (vrfy != reg)
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return -EIO;
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return (val >> 1) & 0x0f;
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}
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static int stw481x_startup(struct stw481x *stw481x)
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{
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/* Voltages multiplied by 100 */
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u8 vcore_val[] = { 100, 105, 110, 115, 120, 122, 124, 126, 128,
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130, 132, 134, 136, 138, 140, 145 };
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u8 vpll_val[] = { 105, 120, 130, 180 };
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u8 vaux_val[] = { 15, 18, 25, 28 };
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u8 vcore;
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u8 vcore_slp;
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u8 vpll;
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u8 vaux;
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bool vaux_en;
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bool it_warn;
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int ret;
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unsigned int val;
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ret = regmap_read(stw481x->map, STW_CONF1, &val);
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if (ret)
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return ret;
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vaux_en = !!(val & STW_CONF1_PDN_VAUX);
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it_warn = !!(val & STW_CONF1_IT_WARN);
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dev_info(&stw481x->client->dev, "voltages %s\n",
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(val & STW_CONF1_V_MONITORING) ? "OK" : "LOW");
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dev_info(&stw481x->client->dev, "MMC level shifter %s\n",
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(val & STW_CONF1_MMC_LS_STATUS) ? "high impedance" : "ON");
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dev_info(&stw481x->client->dev, "VMMC: %s\n",
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(val & STW_CONF1_PDN_VMMC) ? "ON" : "disabled");
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dev_info(&stw481x->client->dev, "STw481x power control registers:\n");
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VCORE_SEL);
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if (ret < 0)
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return ret;
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vcore = ret & 0x0f;
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VAUX_SEL);
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if (ret < 0)
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return ret;
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vaux = (ret >> 2) & 3;
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vpll = (ret >> 4) & 1; /* Save bit 4 */
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VPLL_SEL);
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if (ret < 0)
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return ret;
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vpll |= (ret >> 1) & 2;
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dev_info(&stw481x->client->dev, "VCORE: %u.%uV %s\n",
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vcore_val[vcore] / 100, vcore_val[vcore] % 100,
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(ret & 4) ? "ON" : "OFF");
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dev_info(&stw481x->client->dev, "VPLL: %u.%uV %s\n",
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vpll_val[vpll] / 100, vpll_val[vpll] % 100,
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(ret & 0x10) ? "ON" : "OFF");
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dev_info(&stw481x->client->dev, "VAUX: %u.%uV %s\n",
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vaux_val[vaux] / 10, vaux_val[vaux] % 10,
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vaux_en ? "ON" : "OFF");
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ret = regmap_read(stw481x->map, STW_CONF2, &val);
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if (ret)
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return ret;
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dev_info(&stw481x->client->dev, "TWARN: %s threshold, %s\n",
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it_warn ? "below" : "above",
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(val & STW_CONF2_MASK_TWARN) ?
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"enabled" : "mask through VDDOK");
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dev_info(&stw481x->client->dev, "VMMC: %s\n",
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(val & STW_CONF2_VMMC_EXT) ? "internal" : "external");
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dev_info(&stw481x->client->dev, "IT WAKE UP: %s\n",
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(val & STW_CONF2_MASK_IT_WAKE_UP) ? "enabled" : "masked");
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dev_info(&stw481x->client->dev, "GPO1: %s\n",
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(val & STW_CONF2_GPO1) ? "low" : "high impedance");
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dev_info(&stw481x->client->dev, "GPO2: %s\n",
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(val & STW_CONF2_GPO2) ? "low" : "high impedance");
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ret = regmap_read(stw481x->map, STW_VCORE_SLEEP, &val);
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if (ret)
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return ret;
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vcore_slp = val & 0x0f;
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dev_info(&stw481x->client->dev, "VCORE SLEEP: %u.%uV\n",
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vcore_val[vcore_slp] / 100, vcore_val[vcore_slp] % 100);
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return 0;
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}
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/*
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* MFD cells - we have one cell which is selected operation
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* mode, and we always have a GPIO cell.
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*/
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static struct mfd_cell stw481x_cells[] = {
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{
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.of_compatible = "st,stw481x-vmmc",
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.name = "stw481x-vmmc-regulator",
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.id = -1,
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},
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};
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static const struct regmap_config stw481x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int stw481x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct stw481x *stw481x;
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int ret;
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int i;
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stw481x = devm_kzalloc(&client->dev, sizeof(*stw481x), GFP_KERNEL);
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if (!stw481x)
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return -ENOMEM;
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i2c_set_clientdata(client, stw481x);
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stw481x->client = client;
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stw481x->map = devm_regmap_init_i2c(client, &stw481x_regmap_config);
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if (IS_ERR(stw481x->map)) {
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ret = PTR_ERR(stw481x->map);
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dev_err(&client->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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ret = stw481x_startup(stw481x);
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if (ret) {
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dev_err(&client->dev, "chip initialization failed\n");
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return ret;
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}
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/* Set up and register the platform devices. */
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for (i = 0; i < ARRAY_SIZE(stw481x_cells); i++) {
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/* One state holder for all drivers, this is simple */
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stw481x_cells[i].platform_data = stw481x;
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stw481x_cells[i].pdata_size = sizeof(*stw481x);
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}
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ret = mfd_add_devices(&client->dev, 0, stw481x_cells,
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ARRAY_SIZE(stw481x_cells), NULL, 0, NULL);
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if (ret)
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return ret;
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dev_info(&client->dev, "initialized STw481x device\n");
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return ret;
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}
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static int stw481x_remove(struct i2c_client *client)
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{
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mfd_remove_devices(&client->dev);
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return 0;
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}
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/*
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* This ID table is completely unused, as this is a pure
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* device-tree probed driver, but it has to be here due to
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* the structure of the I2C core.
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*/
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static const struct i2c_device_id stw481x_id[] = {
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{ "stw481x", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, stw481x_id);
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static const struct of_device_id stw481x_match[] = {
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{ .compatible = "st,stw4810", },
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{ .compatible = "st,stw4811", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, stw481x_match);
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static struct i2c_driver stw481x_driver = {
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.driver = {
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.name = "stw481x",
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.of_match_table = stw481x_match,
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},
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.probe = stw481x_probe,
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.remove = stw481x_remove,
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.id_table = stw481x_id,
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};
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module_i2c_driver(stw481x_driver);
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MODULE_AUTHOR("Linus Walleij");
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MODULE_DESCRIPTION("STw481x PMIC driver");
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MODULE_LICENSE("GPL v2");
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